Posts Tagged ‘multiple times’

Remove old unused kernels and cleanup orphaned packages on CentOS / RHEL/ Fedora and Debian Linux

Friday, October 23rd, 2020

remove-old-unused-kernel-on-centos-redhat-rhel-fedora-linux-howto-delete-orphaned-packages

If you administer CentOS 7 / CentOS  8 bunch of servers it is very likely after one of the scheduled Patch days every 6 months or so, you end up with a multiple Linux OS kernels installed on the system.
In normal situation on a freshly installed CentOS machine only one rpm package is installed on the system with the kernel release shipped with CentOS / RHEL / Fedora distro:
The reason to remove the old unused kernels is very simple, you don't want to have a messy installation and after some of the updates to boot up in a revert back old kernel or if you're pedantic to simply save few megas of space.
Some people choose to have more than one kernel just to make sure, if the new installed one doesn't boot, after a restart from ILO / IDRAC remote console interface you can select to boot the proper kernel. I agree having the old kernel before the system *kernel* upgrade as backup recovery is a good thing but this is a good thing to the point the system gets booted after reboot (you know we sysadmins usually after each major system package upgrade), we like to reboot the system warmly praying and hoping it will boot up next time 🙂
 

1. Remove CentOS last XX kernels from the OS

Of course removal of old kernels could be managed by a simple

yum remove kernel


yum-kernel-remove-centos-linux

One more than one kernel is present you can hence leave only lets say the last 2 installed kernel on the CentOS host (some people prefer to have only one) but just for the sake of having a backup kernel I like more to have last two kernels installed present, to do so run package-cleanup which is contained in yum-utils rpm package CentOS – this is CentOS / Redhat ( RHEL) specific command.
 

[root@centos ~ ]:# package-cleanup –oldkernels –count=2

package-cleanup-centos-linux-screenshot-1

–count=number argument – tells how many from the  latest version kernels to get removed.

Note if you don't have the package-cleanup command install yum-utils package:

[root@centos ~ :]#  yum install -y yum-utils

cleanup-old-kernels-linux-leave-only-set-of-2-kernels-active-on-centos-rhel-fedora


2. RemoveOld kernels from Fedora Linux – leave only the latest 3 installed

This is done with dnf by setting the –-latest-limit arg to negative value to how many last kernels want to keep

[root@fedora ~ ]:# dnf remove $(dnf repoquery –installonly –latest-limit=-3 -q)

 

3. Set how many kernels you want to be present on system all the time after package upgrades

It is possible to tell CentOS / RHEL / Fedora's on how many kernels show be kept installed on the system, the default configured on Operating system install time is to keep the last 5 installed kernel on the OS. This is controlled from installonly_limit=5 value that is usually as of year 2020 RPM based distributions found under /etc/yum.conf (on CentOS / RHEL) and in /etc/dnf/dnf.conf (in Fedora) configuration file and sets the desired number of kernels present on system after issuing commands yum upgrade / dnf upgrade –refresh etc.
The minimum number to give to  installonly_limit is 2.
 

4. Remove orphan rpm packages from server

The next thing to do is to check the installed orphan packages to see if we can safely remove them; by orphaned packages we mean all packages which no longer serve a purpose of package dependencies.
Orphan packages are packages who left over from some old dependencies that are no longer needed on the system but just take up space and impose a possible security risk as some of them might end up with time with a public well known and hacked CVE vulnearbility.

Let me try to explain this concept with a quick example: package A is depended on package B, thus, in order to install package A the package B must also be installed. Once the package A is removed the package B might still be installed, hence the package B is now orphaned package.
Here’s how we can safely see the orphan packages we do have on our system:

[root@centos ~ :]#  package-cleanup –quiet –leaves –exclude-bin

And here’s how we can delete them:

[root@centos ~ :]# package-cleanup –quiet –leaves –exclude-bin | xargs yum remove -y


The above commands should be launched multiple times, because the packages deleted with the first batch could create additional orphan packages, and so on: be sure to perform these tasks until no orphan packages appear anymore after the first package-cleanup command.

 

5. Delete Old Kernels and keep only last three ones on Debian / Ubuntu Linux

To do the same on a debian based distribution there is a command is provided by a deb package byobu, if you want to clean up old kernels on Debians :

$ sudo purge-old-kernels –keep 3


That's all folks enjoy ! 🙂

 

Saint Petka Paraskeva of Bulgaria of Epivates Thracia (famous as St. Petka of Tarnovo) feast day 14 October

Friday, October 16th, 2020


Sveta-Petka-Paraskeva-Bylgarska-Balkanska-Epivatska

The inhabitants of Thracia are of a great and royal origin and due to recent historical studies, Thracians have been one of the most developed nations for its time they're developments and achievements especially in crafts such as vessel creation even up to day are perhaps the most unique.
It is still unknown of the exact technology used to create such a elegant and precise vessels. A little is known of the Thracians society as they have reached their bloom in a high speed and the place of the later Roman Empire province Thracia has been in a place where it was destroyed to the ground and robbed at multiple times eradicating unique piece of one of the best created ever forms of art.
Territories of Thrakia has been geographically today located in Southeast Europe, now split among Bulgaria, Greece, and Turkey, which is bounded by the Balkan Mountains to the north, the Aegean Sea to the south, and the Black Sea to the east.

Thrace_and_Thracians-present-day_state_borderlines-picture

Territy of Thracia shown on a contemporary European (Balkans Maps)

World-famous-Thracian-Treasury-picture-1

One of the most famous piece of such art is the World Famous Thracian's Treasuary.

World-famous-Thracian-Treasury-picture

The thrakians Empire and civillization has its bloom from 5th – 4th century before Christ era (B.C.). 
Saint Petka of Epivates region Thrakia was of a Bulgarian origin and lived much later in Xth – XI-th century A.D in Thracia. It is known she was of Bulgarian origin (her mother and father was of Bulgarian origin.) of the first generations who has received in 9-th century Baptism, in the times of the Baptism of Bulgaria conducted by the Apostle equal Saint King Boris I the Baptizer of Bulgaria in year 864 AD.  Thracians as an ancient and a blessed nation in craftship and arts was among the nations who received baptism on a good 'soil', as the seed of beauty and goodness has already been in their civillization.
 

The short Living of Saint Petka of Bulgaria (of Epivates)


Out of this Christian atmosphere has rised Saint Petka also known as (Parashkeva). Saint Petka name means literally translated Friday and due to being born in Thracia on today territory of Balkans she is been venerated highly not only in Bulgaria but across all Orthodox Christians nations on the Balkans – Bulgarians, Romanians, Serbs, Greeks, Macedonians. Due to that Saint Petka is also famous as "Saint Petka of The Bulkans".
Saint Petka could be therefore heard to be called often Petka of Serbs (of Belgrade), Saint Petka of Moldova (of Iași), Mother Paraskeva / ParashkevaParascheva the New, Parascheva the Young, Ancient Greek: Ὁσία Παρασκευὴ ἡ Ἐπιβατινή, Greek: Οσία Παρασκευή η Επιβατινή ή Νέα, Romanian: Cuvioasa Parascheva, Bulgarian / Serbian : Света Петка / Sveta Petka or Петка Параскева / Petka Paraskeva, Paraskeva Pyatnitsa, Parascheva of Tirnovo).

The first information about her living is found in a local educated person (writter) which as of the time were too little and writter  in Greek in short. It did not follow the Church cannons and due to that by an order of Patriarch of Constantinople Nikolas IV Musalon of Constantinople deacon Vaslik has described in a more well systemized way her living, the Greek original unfortunately is now lost. At the time of writting her biography, she has been mostly popular in the realms of Byzantine Empire Thracia.

Bulgarian-Empire-under-King-Ivan-Asen-II-map-1917

The Bulgarian Empire during the reign of Ivan Asen II. Atlas of Dimitar Rizov year 1917

Since the time of King Ivan Asen II a new biogprahy of saint has been written in Bulgarian which included narration of the transfer of her holy relics to Medieval Capital of Bulgaria Tarnovo. However peak and the key towards the immerse veneration to St. Petka that is evident to this very date has played the biography written by last Bulgarian Patriarch also a saint – st. Euthymius of Tarnovo. in year 1385 AD short before the fall under Turkish Slavery of Bulgaria in y. 1393.

Saint Patriarch Eutymious was the last person who in 1393 has actively parcipated in the protection of the fortified Tarnovo and see with his eyes the fall down of the city (by treachery).

When asked by the terrified people 'To whom do you leave us holy father, when the Turkish were taking him away?' He replied heart tearingly 'To the Holy Trinity The Father, The Son and The Holy Trinity our God I leave you and to the most Blessed Mother of God Theotokos now and For Eternity !!!'

Saint-Patriarch-Eutymious-the-last-Blessing-picture-sveti_Evtimij_seten_blagoslov

Saint Patriarch Eutymius (Evtimij) blessing the people in Medieval Bulgarian city Tarnovo for a last time before the Turkish took him away for imprisonment
Picture source Pravoslavieto.com

St Euthymius of Tarnovo work is one of the most unique bibliographies and a precious piece of medieval literature it is innovative for its time and spectacular, emotion rich creation, who become famous far before the borders of Bulgaria in the whole Slavonic world of that time, especially in todays territory of ex soviet countries Romania, Moldova, Ukraine and even far Russia.

Saint_Patriarch-Eutymius-last-bulgarian-patriarch-before-Turkish-Slavery

Saint Patriarch Eutymious of Bulgaria
Picture source Pravoslavieto.com

The veneration of Saint Petka of Bulgaria as a protector of family and a warm prayerer for all those who venerate her in this country has slowly spread in the coming centuries by pupils of St. Euthymius of Tarnovo who according to some historians whose works came to us in the form of the a bit more standardized Church Slavonic used in the Eastern Orthodox Churches as a fruit of the works of St. Euthymus.

The Living of Saint Petka Parashkeva

Sveta_Petka-Bylgarska-Balkanska-holy-icon

Saint Petka Parashkeva Picture source Pravoslavieto.com

Tropion 4-th voice

 Desertous and silent living you loved after Christ your groom, diligently you ran to and his good yoke you took in your younghood,
with the Sign of the Cross against the thought enemies you have manly armed, with fasting feats and prayer and with tear drops the coals of passions extinguished oh highly famed Paraskevo. And now in the Heavenly halls with the wise virgins you stay in front of Christ, pray for us who venerate your holy remembrance.

Kontakion, voice 6

Let us piusly sung our reverend  mother Saint Petka, because by living the corruptable in live, received the imperishable in eternity, becoming holy intercessor for all in trouble and exhausting from the evils of life. For the reason she received from God imperishable fame, glory and grace to be a wonder worker.

Sveta-Petka-Zakrilnica-Bylgarska-Saint_Petka-Protectress-of-Bulgarian-lands

NB ! St. Petka of Epivates has not to be confused with Saint Petka (from Inokia who lived in 303 AD venerated on 28 of October) or  St Petka the Roman (feast day 26 July).

St. Petka's  has been born in city of Epivates in Byzantium (today city called Selim Pasha nearby Odrin's Aegian City) in 10-th Century from a famous and respectful family, her father Nikita has been very rich landowner.

She lived in the second part of X-th century. According to hear living by Patriarch Eutymious, her smaller brother Eutymious who become a monk has been a Metropolitan of Maditos for 40 years and in year (989 – 996) died aged 81 and is shortly after canonized as saint, his younger sister St. Paraskeva passed away after him in the new 11-th century and is aged at least 85 in the time of passing in the city of Kallikrateia. 

The living continues that near the age of 10 year old she heard in a Christian temple a voice by Jesus Christ himself in resemblance to Saint Apostle Paul and said the Evangelical New Testamental words:
"Whoever wants to walk after me, let him deny himself, to take his cross and follow me !".

The unexpected vision convinced the young Paraskeva to immediately exchange her new clothes to a beggers to leave all her belongings to the poor and live a silent living similarto begger for a time in work and prayer, though she did not leave her parents home. On a few occasions all she had worked for has been distributed to the poor.

Sveta-Petka-Bylgarska-Balkanska

Greek typical depiction of Saint Petka of Epivates

When her parents died, her brother as already a monk and Bishop. St. Petka leave her house and travelled to Constanople and received a nun tonsure and as a nun she lived for 5 years near the deserted Church of the "Protection of the Virgin Mary" in the capital suburb of Heraklia. She travelled to the Holy lands visiting Jerusalem and Church of Holy Sepulchre.
Following the example of the blessed famed Saint Mary of Egypt, she lived in Jordan's desert many years till eldership.

Feeling and foreseeing her death, she travelled back through Constantinople to city of Epivates. Settle near the Church "Holy Apostles", where after 2 years of living in deep prayer and fasting labours living in solitary in holiness passed away silently to Christ in heavenly life. Compassionate Christians immediately buried her body of the nun outside of the city walls as a foreigner. A shortly after numerous miracles started happening on her grave.

St_Petka-Parashkeva-Epivatska-Klisura_Monastery_Holy_Icon

Saint Petka Parashkeva Bulgarian Icon from Klisura Monastery located nearby Sofia Bulgaria

In 1230 King Ivan Asen II the most powerful South-eastern European ruler demanded from the the Knights of the Crusaders to submit him her holy relics who are found still in Tracian city Kaliakratea ruled at that time by the Holy Latin Empire. King Ivan Asen II together with the patriach Joachim the first receives her holy relics with honor and settles her incorruptabilities into the newly creates Church in honour of herself St. Petka behind Tsarevets Fortress. Saint Petka became from that point considered as a protectress of the city, the throne and the country.
Her holy relics arrived from Kallikrateia in Tarnovo, the Capital of Second Bulgarian Empire in year 1230 AD, she has been thus called Paraskeva of Tarnovo and has been venerated as a protectress of the Tarnovo city the Bulgarian nation and the country. The attitude towards Saint Petka Tarnovska as a protectress of Bulgarian nation and contry is been clearly seen by the mention in the Bulgarian and International acts (documents) and manuscripts of that XII – XII century.

Saint_Petka-Epivatska-Bylgarska-Romanian-in-Iashi-Romania-veneration-of-romanian-monks

Romanian Monks and Priests venerate the holy relics of Saint Petka of Epivates in Iashi Romania

In subsequent years, St. Petka Paraskevi’s holy relics were transferred to various churches in the region.

In 1393 due to the fall of Bulgarian capital to save them her holy relics were transferred to fortress of Bdin today city of Vidin Bulgaria, but 3 years later 1396 Vidin's fortress also fall under the ungodly yatagan of  the muslim enslaver and to protect the relics they were again transferred to Belgrade, specifically the Ružica Church. When Belgrade fell to Ottoman forces in 1521, the relics were transferred to Constantinople. In 1641, the relics were transferred to Trei Ierarhi Monastery, in Iaşi, Moldavia (nowadays, eastern part of Romania). In 1888, they were transferred to the Metropolitan Cathedral of Iaşi.

Since 1888 they are kept in Romanian city of Iaşi and are a target of pilgrims from all around Romania, Bulgaria and other Orthodox Christian countries of the Balkans. For the day her memory is remembered in the Romanian Church usually about 200 000 people mostly from Romania and others travel to Iaşi's Cathedral in the Trei Ierarhi Monastery (Three Hierarchs – saint John Crysostom, St. Basilius the Great and St. Gregory the Great) of the  for a blessing and to beg the saint for her families, personal issues, curings especially of eye diseases

A severe drought in 1946-47 affected Moldavia, adding to the misery left by the war. Metropolitan Justinian Marina permitted the first procession featuring the coffin containing the relics of Saint Paraskevi, kept at Iaşi since then. The relics wended their way through the drought-deserted villages of Iaşi, Vaslui, Roman, Bacău, Putna, Neamţ, Baia and Botoşani Counties. The offerings collected on this occasion were distributed, based on Metropolitan Justinian's decisions, to orphans, widows, invalids, school cafeterias, churches under construction, and to monasteries in order to feed the sick, and old or feeble monks.

In the historical document with Venezia as of (year 1347), King Ivan Alexander of Bulgaria swears in the name of most holy considered matters, the document says – quote "in the name of God, The Most Holy Theotokos, The Holy Cross and The Most Holy Paraskeva of Tarnovo".

 
Since Second Bulgarian Kingdom, St. Petka has been venerated as a main patroness and protector of Bulgarian nation and country, protectress of countries of Moldova, Romania and Bulgarian cities of Veliko Tarnovo, Gabrovo and Troyan.

In Bulgaria it is an old tradition to name our childs in favour of Saint Petka, my grand-grand mother God Forgive us has also been called Parashkeva in favor of Saint Petka.

Holy Mother Petka Paraskeva (Parashkevo) Pray the Lord Jesus Christ to have mercy on All us the sinners !

Find when cron.daily cron.weekly and cron.monthly run on Redhat / CentOS / Debian Linux and systemd-timers

Wednesday, March 25th, 2020

Find-when-cron.daily-cron.monthly-cron.weekly-run-on-Redhat-CentOS-Debian-SuSE-SLES-Linux-cron-logo

 

The problem – Apache restart at random times


I've noticed today something that is occuring for quite some time but was out of my scope for quite long as I'm not directly involved in our Alert monitoring at my daily job as sys admin. Interestingly an Apache HTTPD webserver is triggering alarm twice a day for a short downtime that lasts for 9 seconds.

I've decided to investigate what is triggering WebServer restart in such random time and investigated on the system for any background running scripts as well as reviewed the system logs. As I couldn't find nothing there the only logical place to check was cron jobs.
The usual
 

crontab -u root -l


Had no configured cron jobbed scripts so I digged further to check whether there isn't cron jobs records for a script that is triggering the reload of Apache in /etc/crontab /var/spool/cron/root and /var/spool/cron/httpd.
Nothing was found there and hence as there was no anacron service running but /usr/sbin/crond the other expected place to look up for a trigger even was /etc/cron*

 

1. Configured default cron execution times, every day, every hour every month

 

# ls -ld /etc/cron.*
drwxr-xr-x 2 root root 4096 feb 27 10:54 /etc/cron.d/
drwxr-xr-x 2 root root 4096 dec 27 10:55 /etc/cron.daily/
drwxr-xr-x 2 root root 4096 dec  7 23:04 /etc/cron.hourly/
drwxr-xr-x 2 root root 4096 dec  7 23:04 /etc/cron.monthly/
drwxr-xr-x 2 root root 4096 dec  7 23:04 /etc/cron.weekly/

 

After a look up to each of above directories, finally I found the very expected logrorate shell script set to execute from /etc/cron.daily/logrotate and inside it I've found after the log files were set to be gzipped and moved to execute WebServer restart with:

systemctl reload httpd 

 

My first reaction was to ponder seriously why the script is invoking systemctl reload httpd instead of the good oldschool

apachectl -k graceful

 

But it seems on Redhat and CentOS since RHEL / CentOS version 6.X onwards systemctl reload httpd is supposed to be identical and a substitute for apachectl -k graceful.
Okay the craziness of innovation continued as obviously the reload was causing a Downtime to be visible in the Zabbix HTTPD port Monitoring graph …
Now as the problem was identified the other logical question poped up how to find out what is the exact timing scheduled to run the script in that unusual random times each time ??
 

2. Find out cron scripts timing Redhat / CentOS / Fedora / SLES

 

/etc/cron.{daily,monthly,weekly} placed scripts's execution method has changed over the years, causing a chaos just like many Linux standard things we know due to the inclusion of systemd and some other additional weird OS design changes. The result is the result explained above scripts are running at a strange unexpeted times … one thing that was intruduced was anacron – which is also executing commands periodically with a different preset frequency. However it is considered more thrustworhty by crond daemon, because anacron does not assume the machine is continuosly running and if the machine is down due to a shutdown or a failure (if it is a Virtual Machine) or simply a crond dies out, some cronjob necessery for overall set environment or application might not run, what anacron guarantees is even though that and even if crond is in unworking defunct state, the preset scheduled scripts will still be served.
anacron's default file location is in /etc/anacrontab.

A standard /etc/anacrontab looks like so:
 

[root@centos ~]:# cat /etc/anacrontab
# /etc/anacrontab: configuration file for anacron
 
# See anacron(8) and anacrontab(5) for details.
 
SHELL=/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# the maximal random delay added to the base delay of the jobs
RANDOM_DELAY=45
# the jobs will be started during the following hours only
START_HOURS_RANGE=3-22
 
#period in days   delay in minutes   job-identifier   command
1    5    cron.daily        nice run-parts /etc/cron.daily
7    25    cron.weekly        nice run-parts /etc/cron.weekly
@monthly 45    cron.monthly        nice run-parts /etc/cron.monthly

 

START_HOURS_RANGE : The START_HOURS_RANGE variable sets the time frame, when the job could started. 
The jobs will start during the 3-22 (3AM-10PM) hours only.

  • cron.daily will run at 3:05 (After Midnight) A.M. i.e. run once a day at 3:05AM.
  • cron.weekly will run at 3:25 AM i.e. run once a week at 3:25AM.
  • cron.monthly will run at 3:45 AM i.e. run once a month at 3:45AM.

If the RANDOM_DELAY env var. is set, a random value between 0 and RANDOM_DELAY minutes will be added to the start up delay of anacron served jobs. 
For instance RANDOM_DELAY equels 45 would therefore add, randomly, between 0 and 45 minutes to the user defined delay. 

Delay will be 5 minutes + RANDOM_DELAY for cron.daily for above cron.daily, cron.weekly, cron.monthly config records, i.e. 05:01 + 0-45 minutes

A full detailed explanation on automating system tasks on Redhat Enterprise Linux is worthy reading here.

!!! Note !!! that listed jobs will be running in queue. After one finish, then next will start.
 

3. SuSE Enterprise Linux cron jobs not running at desired times why?


in SuSE it is much more complicated to have a right timing for standard default cron jobs that comes preinstalled with a service 

In older SLES release /etc/crontab looked like so:

 

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly


As time of writting article it looks like:

 

SHELL=/bin/sh
PATH=/usr/bin:/usr/sbin:/sbin:/bin:/usr/lib/news/bin
MAILTO=root
#
# check scripts in cron.hourly, cron.daily, cron.weekly, and cron.monthly
#
-*/15 * * * *   root  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1

 

 


This runs any scripts placed in /etc/cron.{hourly, daily, weekly, monthly} but it may not run them when you expect them to run. 
/usr/lib/cron/run-crons compares the current time to the /var/spool/cron/lastrun/cron.{time} file to determine if those jobs need to be run.

For hourly, it checks if the current time is greater than (or exactly) 60 minutes past the timestamp of the /var/spool/cron/lastrun/cron.hourly file.

For weekly, it checks if the current time is greater than (or exactly) 10080 minutes past the timestamp of the /var/spool/cron/lastrun/cron.weekly file.

Monthly uses a caclucation to check the time difference, but is the same type of check to see if it has been one month after the last run.

Daily has a couple variations available – By default it checks if it is more than or exactly 1440 minutes since lastrun.
If DAILY_TIME is set in the /etc/sysconfig/cron file (again a suse specific innovation), then that is the time (within 15minutes) when daily will run.

For systems that are powered off at DAILY_TIME, daily tasks will run at the DAILY_TIME, unless it has been more than x days, if it is, they run at the next running of run-crons. (default 7days, can set shorter time in /etc/sysconfig/cron.)
Because of these changes, the first time you place a job in one of the /etc/cron.{time} directories, it will run the next time run-crons runs, which is at every 15mins (xx:00, xx:15, xx:30, xx:45) and that time will be the lastrun, and become the normal schedule for future runs. Note that there is the potential that your schedules will begin drift by 15minute increments.

As you see this is very complicated stuff and since God is in the simplicity it is much better to just not use /etc/cron.* for whatever scripts and manually schedule each of the system cron jobs and custom scripts with cron at specific times.


4. Debian Linux time start schedule for cron.daily / cron.monthly / cron.weekly timing

As the last many years many of the servers I've managed were running Debian GNU / Linux, my first place to check was /etc/crontab which is the standard cronjobs file that is setting the { daily , monthly , weekly crons } 

 

 debian:~# ls -ld /etc/cron.*
drwxr-xr-x 2 root root 4096 фев 27 10:54 /etc/cron.d/
drwxr-xr-x 2 root root 4096 фев 27 10:55 /etc/cron.daily/
drwxr-xr-x 2 root root 4096 дек  7 23:04 /etc/cron.hourly/
drwxr-xr-x 2 root root 4096 дек  7 23:04 /etc/cron.monthly/
drwxr-xr-x 2 root root 4096 дек  7 23:04 /etc/cron.weekly/

 

debian:~# cat /etc/crontab 
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin# Example of job definition:
# .—————- minute (0 – 59)
# |  .————- hour (0 – 23)
# |  |  .———- day of month (1 – 31)
# |  |  |  .——- month (1 – 12) OR jan,feb,mar,apr …
# |  |  |  |  .—- day of week (0 – 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed
17 *    * * *    root    cd / && run-parts –report /etc/cron.hourly
25 6    * * *    root    test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.daily )
47 6    * * 7    root    test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.weekly )
52 6    1 * *    root    test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.monthly )

What above does is:

– Run cron.hourly once at every hour at 1:17 am
– Run cron.daily once at every day at 6:25 am.
– Run cron.weekly once at every day at 6:47 am.
– Run cron.monthly once at every day at 6:42 am.

As you can see if anacron is present on the system it is run via it otherwise it is run via run-parts binary command which is reading and executing one by one all scripts insude /etc/cron.hourly, /etc/cron.weekly , /etc/cron.mothly

anacron – few more words

Anacron is the canonical way to run at least the jobs from /etc/cron.{daily,weekly,monthly) after startup, even when their execution was missed because the system was not running at the given time. Anacron does not handle any cron jobs from /etc/cron.d, so any package that wants its /etc/cron.d cronjob being executed by anacron needs to take special measures.

If anacron is installed, regular processing of the /etc/cron.d{daily,weekly,monthly} is omitted by code in /etc/crontab but handled by anacron via /etc/anacrontab. Anacron's execution of these job lists has changed multiple times in the past:

debian:~# cat /etc/anacrontab 
# /etc/anacrontab: configuration file for anacron

# See anacron(8) and anacrontab(5) for details.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
HOME=/root
LOGNAME=root

# These replace cron's entries
1    5    cron.daily    run-parts –report /etc/cron.daily
7    10    cron.weekly    run-parts –report /etc/cron.weekly
@monthly    15    cron.monthly    run-parts –report /etc/cron.monthly

In wheezy and earlier, anacron is executed via init script on startup and via /etc/cron.d at 07:30. This causes the jobs to be run in order, if scheduled, beginning at 07:35. If the system is rebooted between midnight and 07:35, the jobs run after five minutes of uptime.
In stretch, anacron is executed via a systemd timer every hour, including the night hours. This causes the jobs to be run in order, if scheduled, beween midnight and 01:00, which is a significant change to the previous behavior.
In buster, anacron is executed via a systemd timer every hour with the exception of midnight to 07:00 where anacron is not invoked. This brings back a bit of the old timing, with the jobs to be run in order, if scheduled, beween 07:00 and 08:00. Since anacron is also invoked once at system startup, a reboot between midnight and 08:00 also causes the jobs to be scheduled after five minutes of uptime.
anacron also didn't have an upstream release in nearly two decades and is also currently orphaned in Debian.

As of 2019-07 (right after buster's release) it is planned to have cron and anacron replaced by cronie.

cronie – Cronie was forked by Red Hat from ISC Cron 4.1 in 2007, is the default cron implementation in Fedora and Red Hat Enterprise Linux at least since Version 6. cronie seems to have an acive upstream, but is currently missing some of the things that Debian has added to vixie cron over the years. With the finishing of cron's conversion to quilt (3.0), effort can begin to add the Debian extensions to Vixie cron to cronie.

Because cronie doesn't have all the Debian extensions yet, it is not yet suitable as a cron replacement, so it is not in Debian.
 

5. systemd-timers – The new crazy systemd stuff for script system job scheduling


Timers are systemd unit files with a suffix of .timer. systemd-timers was introduced with systemd so older Linux OS-es does not have it.
 Timers are like other unit configuration files and are loaded from the same paths but include a [Timer] section which defines when and how the timer activates. Timers are defined as one of two types:

 

  • Realtime timers (a.k.a. wallclock timers) activate on a calendar event, the same way that cronjobs do. The option OnCalendar= is used to define them.
  • Monotonic timers activate after a time span relative to a varying starting point. They stop if the computer is temporarily suspended or shut down. There are number of different monotonic timers but all have the form: OnTypeSec=. Common monotonic timers include OnBootSec and OnActiveSec.

     

     

    For each .timer file, a matching .service file exists (e.g. foo.timer and foo.service). The .timer file activates and controls the .service file. The .service does not require an [Install] section as it is the timer units that are enabled. If necessary, it is possible to control a differently-named unit using the Unit= option in the timer’s [Timer] section.

    systemd-timers is a complex stuff and I'll not get into much details but the idea was to give awareness of its existence for more info check its manual man systemd.timer

Its most basic use is to list all configured systemd.timers, below is from my home Debian laptop
 

debian:~# systemctl list-timers –all
NEXT                         LEFT         LAST                         PASSED       UNIT                         ACTIVATES
Tue 2020-03-24 23:33:58 EET  18s left     Tue 2020-03-24 23:31:28 EET  2min 11s ago laptop-mode.timer            lmt-poll.service
Tue 2020-03-24 23:39:00 EET  5min left    Tue 2020-03-24 23:09:01 EET  24min ago    phpsessionclean.timer        phpsessionclean.service
Wed 2020-03-25 00:00:00 EET  26min left   Tue 2020-03-24 00:00:01 EET  23h ago      logrotate.timer              logrotate.service
Wed 2020-03-25 00:00:00 EET  26min left   Tue 2020-03-24 00:00:01 EET  23h ago      man-db.timer                 man-db.service
Wed 2020-03-25 02:38:42 EET  3h 5min left Tue 2020-03-24 13:02:01 EET  10h ago      apt-daily.timer              apt-daily.service
Wed 2020-03-25 06:13:02 EET  6h left      Tue 2020-03-24 08:48:20 EET  14h ago      apt-daily-upgrade.timer      apt-daily-upgrade.service
Wed 2020-03-25 07:31:57 EET  7h left      Tue 2020-03-24 23:30:28 EET  3min 11s ago anacron.timer                anacron.service
Wed 2020-03-25 17:56:01 EET  18h left     Tue 2020-03-24 17:56:01 EET  5h 37min ago systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service

 

8 timers listed.


N ! B! If a timer gets out of sync, it may help to delete its stamp-* file in /var/lib/systemd/timers (or ~/.local/share/systemd/ in case of user timers). These are zero length files which mark the last time each timer was run. If deleted, they will be reconstructed on the next start of their timer.

Summary

In this article, I've shortly explain logic behind debugging weird restart events etc. of Linux configured services such as Apache due to configured scripts set to run with a predefined scheduled job timing. I shortly explained on how to figure out why the preset default install configured cron jobs such as logrorate – the service that is doing system logs archiving and nulling run at a certain time. I shortly explained the mechanism behind cron.{daily, monthy, weekly} and its execution via anacron – runner program similar to crond that never misses to run a scheduled job even if a system downtime occurs due to a crashed Docker container etc. run-parts command's use was shortly explained. A short look at systemd.timers was made which is now essential part of almost every new Linux release and often used by system scripts for scheduling time based maintainance tasks.

The beheading of Saint John the Baptist feats in Eastern Orthodox Church – A short history of saint John Forerunners Holy Relics

Saturday, September 14th, 2019

Beheading_of_St_John_the_Baptist_Icon_IX-century

Saint John the Baptist (The Forerunner of Christ) is all known for being the baptizer of the Lord Jesus Christ in Jordan's river in Israel.

However as nowadays most people are away from the Church and from traditions, that many generations of our ancestors used to follow, little know the details of his beheading and the meaning of why he is venerated so much by so many generations in the last 2000 years.

Thus In this small article, I'll try to shed some light on the Saint John Beheading feast known in Church Slavonic world as Oseknovenie (Осекновение) = beheading and is considered a day of sorrow for the Church for the reason the biggest Old Testamental prophet, a hermit and a man of Gigantic spiritual significance Saint John the Baptist has been beheaded unfairly for having no fault at all but this happened so his righteousness raise up even more and be clear for the generations to come.

The feast of Saint John the Baptist is celebrated on 29 of August in Eastern Orthodox Church, where old Calendar Churches celebrate the feast (13 days) later on 11 of September – I'll not get into details about calendars as this is a long discussion for a separate article.

It should be said in the Church saint John the Baptist is considered the highest saint among all“the first among martyrs in grace”, venerated next in glory to Virgin Mary.

The Martyrdom of Saint John happened in the 32 years after the Nativity (The Birth) of Christ as this is said in the Gospel of Mathew 14:1-12 and Gospel of Mark (6:14-29) in New Testament.

Saint-John-The-Baptist-Orthodox-Bulgarian-icon

Many of the small details, we know about saint John and his earthly living are not given in the Gospel however, but are instead given in the Chuch Tradition (that is kept in the main books and the Living of the Saints, as well as all the books written by the officially canonized saints over the years that used for Eastern Orthodox Church services Singing for many centuries).

From there we know the beheading of Saint John happened short time before the Crucifixion of Christ. After the death of Herode the Great, Romans divided the territory of Province of Palestine in 4 parts and on top of each placed his governor.

Herodos Antipa received by Emperor Augustus Galilea as a territory of Governance. He had a law binded marriage, who was a daughter of king Arepha. Herod left her and cohabited (unlawfully) with Herodias who was his mistress and brother's wife.

As Herodos was a governer and recpetively example for all his subordinate in his Kingdom and was living unlawfully with that woman saint John who knew him personally rebuked him multiple times publicly advising him to leave that woman and live with his lawfully marriaged one as it was written in God's law – that such people are worthy for death just like moreover this was the unwritten law followed by all kind of peoples of his time from noble to smallest and poorest.

Herodoes did not listened and wanted to get rid of saint Johns somehow but he was scared to accuse him for some kind of kingdom lawlessness as the knew saint John was a true prophet of God and feared the people who recognized him as a true prophet  as well as feared he might be put off throne for his evil deed if he finds an excuse to kill the prophet of God.

As the critics on Herodoes living with a concubine while being in marriage, eventually not finding any other way to shut Saint John's mouth, king Herodoes put saint John in Prison with the excuse Saint John was a rebel and preaching things against established authority (About this event is said in Bible Gospel of Luke 3, 19-20).

For his birthday Herodoes prepared enormous banquet in which in front of the many invited guests danced (Salome / Salomia) – the daughter of Herod II and Herodias and her dancing was so much pleasing for the already drunk Herod and in his drunkenness he promised to give her anything she desired up to half of his kingdom.
Salome was still young woman and as it was the tradition then not knowing what would be the best to ask for, she asked her Mother and the Mother being in unlawful relations with Herod in her hatred for the rebuking prophet saint John asked, the head of Saint John the Baptist on a platter.

The-Beheading-of-Saint-John-The-Baptist-Salomnia-dance-in-front-of-Herodos-Sv.-Ioan-Krastitel

The dance of Salome with Saint John's head on a Platter Orthodox icon

Even though Herod was appaled by this strange request, he had to reluctanly agree to keep his word as he was a ruler of a great power and for that time, not keeping a word publicly given would make him though weak, a fraudulant and eventually this will be reason for a rumors for his unseriousness to circulate the kingdom, thus unwillingly he agreed sent soldier to the prison to behead Saint John and the Head of the saint was brought to the perverted Solome and the harlot mother of hers Herodias.

Due to Church tradition when the Head of the 'Biggest in Spiritual Power' of Man born after Christ, as the Gospel speaks was brought to the lecherous feast, the Head even in the platter continued to rebuke, the unwalfullness of Herod.
 

The Jewish famous Historian Flavius Josiphus in his historical book Antiques of the Jews wrote, the reason for beheading of Saint John was:

"lest the great influence John had over the people might put it into his [John’s] power and inclination to raise a rebellion, (for they seemed ready to do any thing he should advise), [so Herod] thought it best [to put] him to death."

Flavius also states that many of the Jews believed that the military disaster that fell upon Herod as his throne fall a by the hands of Aretas his (father-in-law) was God's immediate punishment for unrighteous behaviour.
There is no exact date when behading of Saint John occured but the historians place it somewhere in year 28 or 29 A. D. (Anno Dommini).

Execution_of_John_the_Baptist_orthodox-icon


The body of saint John was buried immediately (separately from the body) as Herodias for her hatred for the prophet ordered the body to be buried separately from the head, it was buried in the small Palestinian Village (Sebaste), while Herodias took his holy head and buried it in a dung heep. 
Later Joanna (canonized later by saint known as Saint Joanna) – a wife of Herods steward, secretly went to place took the head and buried in the Mount of Olives, where it remained hidden for many centuries.

But the wrath of God is never late soon after Salome was passing a frozen river and while walking on it the ice collapsed and her body up to the head fall hanging in the water, while her head was sitting still over the water.
Just as she used to kick her feet on the ground, she was now, like dancing, making helpless movements in icy water.
 

So Salome hung until the sharp ice cut through her neck. Her head, cut off with a sharp ice, then her head was brought to Herod and Herodias, as John the Baptist's head had once been brought to them, and her body had never been found. The king of Arif of Arabia, in revenge for the dishonor of his daughter – the wife of Herod the four-owner – moved his troops against the wicked king and defeated him. The Roman emperor Guy Julius Caesar Caligula (37-41) in anger sent Herod, together with Herodias, into captivity to Gaul, and then to  . There they were consumed by the sprawling earth.


By a divine revelation the head of Saint John has been found in the 4th century (Celebrated in the Church with a special feast known as The First Finding of Saint John's the Baptist head by a governing official of Eastern Roman empire district who eventually choose to become a monk (monk Inokentij / Innocent). The head of saint John has been found by both divine revelation and the testimony of an Old Jew who confirmed the Jewish oral tradition for the burial of John the Baptist head on that exact place .
Innocent decided to build a Church and a monastic Cell in glory of Saint John the Baptist as the place was holy and sanctified by the graceous head of St. John.
Fearful that holy relics of such a high importance, might be soon stolen and sold, mocked over by unbelievers or destroyed, he immediately hide (burid) the St. John on the very same place, where he found it in the same vessel it was orginally.
Unfortunately on monk Innocent dead the Church fell into ruin was abandoned due to its desert location and eventually as it always happened in that times with old buildings, people used its construction stones for fortifying their own near village houses.

The Second Finding of the Head of Saint John the Baptist, happened some years later in 452 A.D. , during the days of Constantine the Great by two Christian monks who went for a Jerusalem for pilgrimage.who had God given revelation (Saint John himself appeared in a kind of a Vision to the two) and hsa indicated for the same hidden location where Innocent found it (laying under the Church ruins altar).
After digging on the place, the holy relic was found placed in a sack and brought with them to heir home land. On the way back they've met a potter not telling him what was inside the bag and asked him the bag to carry being lazy to do. Saint John the Baptist appeared the potter and told him to take his head and bring it away from this careless lazy monks immediately. The potter took Saint John's head home, and kept it there praying fervently to saint John the Baptist daily, soon before his death he put the head in a container and gave it to his sister.
The 1st and 2nd finding of saint Johns head is established as a feast celebrated yearly in Eastern Orthodox Church on 24 of February.

beheading-of-saint-John-icon

The feast of Beheading of Saint John in the Church is always observed in the Eastern Orthodox Churches Bulgarian, Russian, Serbian, Greek, Romanian, Georgian etc. with a strict fasting as a sign for the great sorrow we Christians have for the beheading of the Greatest of Prophets and Highest in sight of God born of man.

In some cultures, the pious will not eat food from a flat plate, use a knife, or eat round or red food (such as tomatoes, watermelon, red peppers etc.) on this day.

A short time after a Hieromonk Eustathius (considered by Church historians) to be part of the Arian heretical division happen to have th chance to possess the holy head and he used it frequently to attract followers to the Heretical teachings of Arius (a Lybian heretic presbyter who was condemned in 325 A.D. on the First Council of Nicea convened by Saint Emperor Constantine The Great. Being in a hardships Eustathius buried the head in a cave near Emesa (circa 810 – 820) and soon after a monastery was built on that place by God's providence.

In the year 452, St. John the Baptist appeared to Archimandrite Marcellus of this monastery and indicated where his head was hidden in a water jar buried in the earth. The relic was brought into the city of Emesa and was later transferred to Constantinople.

Saint_John_Head_Holy-relics-Caput-Sti-Joannis-Baptistae-Praecurssoris-Domini-1

The current pressumable relics of head of Saint John the Baptist kept in San Silvestro in Capite Rome

The head of John Baptist disappeared once again after it was transferred from Comana of Cappadocia during a period of Muslim raids (about 820) and was again hidden in the ground during a period of iconoclastic persecusion.
After the veneration of icons was restored in year 850, A vision was revelead by God to patriarch Ignatius of Constantinople (ruling on patriarchial throne in 847 – 857) saw a vision revealing the place where the head of saint John was hidden around y. 850. The patriarch as the order was then communicated about his vision to emperor Michael III, who sent a delegation to Comana, where the head was found. Soon after the head was transferred to city of Nyc and here on 25 of May it was placed in a church in emperor court in Constantinople. The Church feast of the Third Finding of Saint John Baptist head is established for celebration in the Eastern Orthodox Church on 25 of May.

Third-finding-of-Saint-John-the-Baptist-head-holy-relics-orthodox-icon

Currently many small particles of Saint John Head are available for generation among many Eastern Orthodox and Roman Catholic Churches.

The-Face-of-saint-John-the-Baptist-in-Cathedral-of-Our_Lady-in-Amiens-Cathedral

The head  is claimed to be in San Silvestro (Saint Silvester) in Capite in Rome or in Amiens Cathedral, said to have been brought from Constantinople by Wallon de Sarton as he was returning from the Fourth Crusade.
There are also some sources claiming that the real head of John the Baptist is buried in Turkish Antioch or Southern France.

Amiens_-_Cathedrale_Notre-Dame_France

Amiens Cathedrale Notre Dame France – one of most magnificent Gothic edifice in Europe.

During the French Revolution the kept Head in Amiens has been secretly hidden by the Amiens city Mayor in his own home to protect this sacred relic from the destruction (as many holy relics saints disappeared or have been destroyed) by the rebellious enraged crowds fighting for the rights of "Liberty, Equality, Fraternity" being the goals of the Masonic bortherhoods and many secret societies in France in that time.

Also a reliquary at the Residenz in Munich, Germany, is labeled as containing the skull of John the Baptist by Catholics. In history some sources claim the St. John used to be owned by Knight Templars
А piece of Saint John Baptist skull is held at the Eastern Orthodox Romanian skete Prodromos on Mount Athos.

Further on according to Church tradition saint Luke the Evangelist went to the city of Sebaste bringing with him the right hand of Saint John the Forerunner which was conducting numerous of miracles.

Some of the Relics of John the Baptist are said to be in the possession of the Coptic Orthodox Monastery of Saint Macarius the Great in Scetes, Egypt.
It is said John the Baptist's arm and a piece of his skull can be found at the Topkapı Palace in Istanbul, Turkey.

the_Holy-head-of-saint-John-the-Baptist-relics

It is said John the Baptist's arm and a piece of his skull can be found at the Topkapı Palace in Istanbul, Turkey.
At the time of Mehmed the Conqueror, the skull was held in Topkapı, while after his death, his stepmother Mara Branković, a Serbian princess, brought it to Serbia. It was then kept a while at the Dionisios monastery at Mount Athos, then the skull fragment was sent to a nearby island in order to prevent the outbreak of a plague; however, the Ottoman fleet seized it and delivered it to Hasan Pasha of Algeria, who held it in his home until his death. It was then returned to Topkapı. The skull is kept on a golden plate decorated with gold bands with gems and Old Serbian inscriptions. The plate itself is stored in a 16th-century rock crystal box.

The-Face-of-saint-John-the-Baptist-in-Cathedral-of-Our_Lady-in-Amiens-Holy-Relics

The face of St. John the Baptist, in the Cathedral of Our Lady in Amiens.

St. John's arm was brought from Antioch to Constantinople at the time of Constantine VII. It was kept in the Emperor's chapel in the 12th century, then in the Church of the Virgin of the Pharos, then in the Church of Peribleptos in the first half of the 15th century. Spanish envoy Clavijo reported that he saw two different arms in two different monasteries while on a visit to Constantinople in 1404. With the Fall of Constantinople, the Ottomans seized possession of it. In 1484, Bayezid II sent it the knights of Rhodes, while they held his brother Cem captive in return. In 1585, Murad III had the arms brought from Lefkosia castle to Constantinople (henceforth known as Istanbul). The arm is kept in a gold-embellished silver reliquary. There are several inscriptions on the arm: "The beloved of God" on the forefinger, "This is the hand of the Baptist" on the wrist, and "belongs to (monk) Dolin Monahu" on the band above the elbow.

In July 2010, a small reliquary was discovered under the ruins of a 5th-century monastery on St. Ivan Island, Bulgaria. Local archaeologists opened the reliquary in August and found bone fragments of a skull, a hand and a tooth, which they believe belong to st. John the Baptist, based on their interpretation of a Greek inscription on the reliquary.The remains have been carbon-dated to the 1st century. Currently The found relics are being placed for veneration in the sea resort town  of Sozopol, Bulgaria in the Church of saint saint Cyril and Methodius.

The_Holy_Relics-of-Saint-John-The-Baptist-kept-in-Saint-Cyril-Church-Sozopol

Saint John the Baptist Holy Relics in Sozopol Bulgaria

 

Sozopol-Lithia-Lity-with-the-holy-relics-of-saint-John-the-Baptist
 A Lity (Orthodox Vespers) in front of Saint Cyril and Methodius Church in Sozopol resort Bulgaria

There is much to be said in Saint Johns beheading and many great Theology books have been written on the topic however I hope the goal of this article to give a very brief overview for the ordinary people to know our human history over the last 2000 which is highly entangled with Christian faith  succeeded to give a very brief overview on the history of the beheading of saint John the Baptist and the deep history across his holy relics veneration over the centuries.

As a closure for the Article I find worthly to share the sung troparion in the Church services glorifying of saint John the Forerunner in Old Bulgarian / Church Slavonic, Greek and English

TROPARION IN CHURCH SLAVONIC

Па́мять пра́веднаго с похвала́ми, тебе́ же довле́ет свиде́тельство Госпо́дне, Предте́че: показа́л бо ся еси́ вои́стинну и проро́ков честне́йший, я́ко и в струя́х крести́ти сподо́бился еси́ Пропове́даннаго. Те́мже за и́стину пострада́в, ра́дуяся, благовести́л еси́ и су́щим во а́де Бо́га, я́вльшагося пло́тию, взе́млющаго грех ми́ра и подаю́щаго нам ве́лию ми́лость.

TROPARION IN GREEK

Μνήμη Δικαίου μέτ' ἐγκωμίων, σοὶ δὲ ἀρκέσει ἡ μαρτυρία τοῦ Κυρίου Πρόδρομε· ἀνεδείχθης γὰρ ὄντως καὶ Προφητῶν σεβασμιώτερος, ὅτι καὶ ἐν ῥείθροις βαπτίσαι κατηξιώθης τὸν κηρυττόμενον. Ὅθεν τῆς ἀληθείας ὑπεραθλήσας, χαίρων εὐηγγελίσω καὶ τοῖς ἐν ᾍδῃ, Θεὸν φανερωθέντα ἐν σαρκί, τὸν αἴροντα τὴν ἁμαρτίαν τοῦ κόσμου, καὶ παρέχοντα ἡμῖν τὸ μέγα ἔλεος.

TROPARION (TONE 4)
O Prophet and Forerunner of the coming of Christ, in spite of our eagerness to render you due honor, we fall short when singing your praise. Your glorious birth saved your mother from the shame of barrenness, returned to your father the power of speech, and proclaimed to the world the Incarnation of the Son of God.

KONTAKION (TONE 3)
The woman who had been barren becomes fertile and gives birth today to the Forerunner of Christ. He is the greatest and last of the prophets, for standing in the waters of the Jordon River, he placed his hands on Christ whom all the prophets had announced, and in so doing he became a prophet himself, a preacher and a forerunner of the Word of God.

ClamTK Linux Desktop Anti-Virus program – Checking Windows mapped drives with ClamTK

Thursday, June 20th, 2013

Linux desktop graphical program to scan for-viruses ClamTK clamav frontend application

In general Linux has fame for being Virus Free Operating System. During the 13 last years as dedicated GNU / Linux user, I've seen Linux servers with binaries infected with Viruses, however the hosts, were severely messed hosts because noone updated them on time and script kiddy crackers has "hacked" multiple times. In lifetime one of my old testing computers got infected with Virus because of my mistake of running "suspicious" pre-compiled "cracker" software binaries with no MD5 verification and "questionable" websites…
I share this story because, I want to beat-up the Myth that Linux cannot have Viruses. It CAN but not very likely to happen 🙂

As a Desktop user over the last 10 years, even though I installed plenty of packages from third party sources and never happened to infect my computer with Virus – or at least if I infected I never knew it. A lot of popular MS-Windows Anti-Virus programs, has already ports for Linux. Just to mention few non-free Linux AV software providing install binaries;

  • Avast

  • BitDefender

  • AVG

  • Dr. Web

Though risk of Viruses on Linux is so tiny, it is useful to have ANTI-Virus Software to check files received from Skype, E-mails and onse downloaded with Browser. I always prefer so until now I used Clamav Antivirus to keep an eye periodically on my Desktop Linux host and servers running mail servers (those who run Mail Servers know how useful is Clamav in stopping tons of E-mail attached Malware Viruses and Trojans).

I use mostly Debian Linux, so on every new server or Desktop one of first things I did was to install it, i.e.:

# apt-get --yes install clamav
...

Before I knew Clamav AV for Windows has GUI, anyways till recently I didn't know if there is some kind of free software AV Graphical frontend for Linux. I just found out about ClamTK

Linux Free Antivirus ClamTk clamav Virus Scanner graphical frontend

ClamTK is available in most Linux distributions from default package repositories

On Debian and Ubuntu to install it run common:

debian:~# apt-get --yes clamtk
...

On Fedora and CentOS Linux to install:

[root@fedora ~]# yum -y install clamtk
...

Its best to run it as root superuser (or via sudo) to make ClamTK able read all files or mounts on system:

hipo@debian:~$ sudo clamtk

ClamTK is very simple to use and there are only few configuration options;
clamtk desktop linux free antivirus startup preferences

clamtk scan for viruses linux gui proxy

linux Anti-Virus Desktop graphics  easy to use AntiVirus ClamTK preferences screenshot

ClamTK is very useful when used with mounted Samba Shared (Mapped) Windows drives to scan for Viruses and malware, i.e, after mounting share using cmd like:

# smbmount //192.168.2.28/projects /mnt/projects -o user=USERNAME

Clean disk space, fix broken shortcuts and delete old restore points on Windows 98,XP, 2000 with Free Spacer

Thursday, February 28th, 2013

 

freespacer perfect clean disk space on Windows 98 XP 2000 russian software

If you end up with a low disk space, or a lot of broken shorcuts without knowing how this exaclty happened  on  Windows XP and you need to free some disk space on OS without manually bothering to delete Windows Temporary files. Check out a tiny Russian Program called Free Spacer. The program is a good substitute for the inefficient windows default app Disk Cleaner. Free Spacer is FreeWare and it can be just used "as it is" but unfortunately access to source code is unavailable as well as use for commercial purposes is prohibited.

I've used Free Spacer multiple times on messed up PCs and always it does good, it is an excellent piece of software. Any Windows-Admin knows  Cleaning some disk space from unnecessary junk files, makes PC work faster. Free Spacer is very useful to run on Virus infested PCs, together with SpyBot , Malware Bytes and some AV soft like Avira.

As software is Russian, unfortunately menu buttons are in Russian too. Even non-russians can easily orientate as the most important buttons are first two from up to bottom and the last which is exit. The first button on from top onwards starts searching for garbage and obsolete and temporary files you can afterwards delete with the second button Удалить – meaning Delete in Russian). A note to make here is on newer Windows than XP Pro or XP Home FreeSpacer does not work well; even though it installs and runs on x86 Windows Vista and Win 7 it hangs up during scan.

For latest version of FreeSpacer check Free Spacer's Official version here, only available in Russian. As of time of writting this post FreeSpacer's latest version is 1.67, I've created mirror of FreeSpcer 1.67 here.

Here is description of what FreeSpacer "features" translated to English:

  • Powerful cleaner drive of unnecessary files.
  • Cleans efficient found "garbage." files
  • A large number of masks for the detection of unnecessary files / folders.
  • Cleanup folders with temporary files, not only Windows / Internet, but about 30 popular programs.
  • Search for invalid shortcuts.
  • Search system restore points.
  • Search for missing files and folders.
  • Support Exclude files and folders.
     

How to: Open Office view / edit .doc , .odt document in Full Screen mode

Tuesday, January 8th, 2013

Most programs, like Firefox, Opera, Chrome, Adobe Acrobat Reader, Evince etc. etc. have as a default set F11 to bring the program to full screen.  It seems logical that the Linux substitute for Microsoft Office – Open Office should also go full screen while the user press F11, but weirdly it doesn't.

Pressing F11 in Open Office on my current Debian Squeeze (6.0.5) Stable Linux with OpenOffice.org 3 brings to screen Styles and Formatting customization dialog.

openoffice.org 3 debian linux F11 key press Styles and Formatting dialog screenshot

I'm not sure why openoffice is behaving like this, but one of my guess is cause OpenOffice was multiple times upgraded whenever I upgraded my Debian to latest stable with apt-get update && apt-get upgrade thus most likely still some keyboard bindings from older OO versions are affecting it. There are two ways to make OpenOffice display in Full-Screen.

1. Using OO menus

Use View -> Full Screen (F11)

As I said it is possible, the F11 key assignment is still reacting to old config assignment as in dialog for full screen the Shortcut key said to bring OO full-screen is F11.

2. Making OpenOffice FullScreen through keyboard

Keyboard config to bring OpenOffice to Full-Screen mode is a simultaneous key-press of:

CTRL + SHIFT + J

Pressing Ctrl + Shift + J again brings OO to its standard window.

Openoffice / Libreoffice run in full screen screenshot pic Debian squeeze Linux

Though I'm not sure I assume in newer OpenOffice versions now distributed under the LibreOffice name (cause of some Patents and Licensing issues), CTRL + SHIFT + J should bring up LibreOffice in Full-Screen too. I don't have at hand installed version of LibreOffice, so if someone can confirm for sure of Ctrl + Shift + J makes LibreOffice go FullScreen? Please drop comment.

Cheers 😉
 

How to enable AUTO fsck (ext3, ext4, reiserfs, LVM filesystems) checking on Linux boot through /etc/fstab

Tuesday, July 12th, 2011

How to auto FSCK manual fsck screenshot

Are you an administrator of servers and it happens a server is DOWN.
You request the Data Center to reboot, however suddenly the server fails to boot properly and you have to request for IPKVM or some web java interface to directly access the server physical terminal …

This is a very normal admin scenario and many people who have worked in the field of remote system administrators (like me), should have experienced that bad times multiple times.

Sadly enough only a insignifant number of administrators try to do their best to reduce this down times to resolve client stuff downtime but prefer spending time playing the ztype! game or watching some porn website 😉

Anyways there are plenty of things like Server Auto Reboot on Crash with software Watchdog etc., that we as sysadmins can do to reduce server downtimes and most of the manual human interactions on server boot time.

In that manner of thougts a very common thing when setting up a new Linux server that many server admins forget or don’t know is to enable all the server partition filesystems to be auto fscked during server boot time.

By not enabling the auto filesystem check options in Linux the server filesystems did not automatically scan and fix hard drive partitions for fs innode inconsistencies.
Even though the filesystems are tuned to automatically get checked on every 38 system reboots, still if some kind of filesystem errors are found that require a manual confirmation the boot process is interrupted and the admin ends up with a server which is not reachable remotely via ssh !

For the remote system administrator, this times are a terrible times of waitings, prayers and hopes that the server hardware is fine 😉 as well as being on hold to get a KVM to get into the server manually and enter the necessery input to fsck prompt.

Many of this bad times can be completely avoided with a very simple fix through /etc/fstab by enabling all server partitions containing any filesystem to be automatically checked and fixed in case if inconsistencies or errors are found by fsck.ext3, fsck.ext4, fsck.reiserfs etc. commands.

A very typical default /etc/fstab file you will find on many servers should look something like:

/dev/sda8 / ext3 errors=remount-ro 0 1
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/sda1 /home ext3 defaults 0 0

Notice the line:
/dev/sda1 /home ext3 defaults 0 0

The first column in the example contains the device name, the second one its mount point, third its filesystem type, fourth the mount options, fifth (a number) dump options, and sixth (another number) filesystem check options. Let’s take a closer look at this stuff.

The ones which are interesting to enable auto fsck checking and error resolving is provided usually by the last sixth variable (filesystem check option) which in the above example equals 0 .

When the filesystem check option equals 0 this means the auto fsck and repair for the respective filesystem is disabled.
Some time in the past the dump backup option (5th option in the example) was also used but as far as I can understand today it’s not that important in modern GNU/Linux distributions.

Now having the above sample crontab in order to enable the fsck file checking on Linux boot for /dev/sda1 , we will need to modify the above line’s filesystem check option be 2, e.g. the line would afterwards look like:

/dev/sda1 /home ext3 defaults 0 2

Setting the 2 as an option for filesystem check is necessery for every filesystem which is not mounted as a root filesystem /

In above example /etc/fstab you already see that auto filesystem fsck is enabled for root partition:

/dev/sda8 / ext3 errors=remount-ro 0 1
(notice the 1 in the end of the line)

Finally a modified version of the default sample /etc/fstab which will check the extra /dev/sda1 /home partition would look like so:

/dev/sda8 / ext3 errors=remount-ro 0 1
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/sda1 /home ext3 defaults 0 2

Making sure all Linux server partitions has the auto filesystem check option enabled is something absoultely necessery!
Enabling the auto fsck on servers always makes me sleep calmer 😉
Hope it helps your too. 🙂