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Thursday, 28th March 2024

Comment on Improve Websites SEO: Optimize images to Increase website loading performance on Linux server – Image Compress tools by admin.

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Improve Websites SEO: Optimize images to Increase website loading performance on Linux server – Image Compress tools
Here is also two other tips to optimie:

find . -iname ‘*.jpg’ -print0 | xargs -0 jpegoptim –max=90 –strip-all –preserve –totals;
find . -iname ‘*.png’ -print0 | xargs -0 optipng -o7 -preserve;


./images/back.jpg 85×203 24bit Adobe [OK] 1044 –> 724 bytes (30.65%), optimized.
./images/322.jpg 100×100 24bit JFIF [OK] 3044 –> 2666 bytes (12.42%), optimized.
./images/257.jpg 100×100 24bit JFIF [OK] 2929 –> 2533 bytes (13.52%), optimized.
Average compression (1636 files): 48.48% (10643k)

** Processing: ./selector-arrow.png
13×10 pixels, 4 bits/pixel, 16 colors (1 transparent) in palette
Input IDAT size = 81 bytes
Input file size = 211 bytes

Trying:
zc = 9 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 9 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 8 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 8 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 7 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 7 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 6 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 6 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 5 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 5 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 4 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 4 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 3 zm = 9 zs = 0 f = 0 IDAT size = 68
zc = 3 zm = 8 zs = 0 f = 0 IDAT size = 68
zc = 3 zm = 9 zs = 1 f = 0 IDAT size = 68
zc = 3 zm = 8 zs = 1 f = 0 IDAT size = 68

Selecting parameters:
zc = 3 zm = 8 zs = 1 f = 0 IDAT size = 68

Output IDAT size = 68 bytes (13 bytes decrease)
Output file size = 198 bytes (13 bytes = 6.16% decrease)


Improve Websites SEO: Optimize images to Increase website loading performance on Linux server – Image Compress tools
Make sure you check all your pictures output as it happened one time to me that some images got screwed up. Make sure you run the batsch script only in case if the images are coming in the same format and created by the same Graphic Editor other wise better off run it to a dir and do serious testing that all pictures are viewable after that ..


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Install and configure rkhunter for improved security on a PCI DSS Linux / BSD servers with no access to Internet
       –rwo, –report-warnings-only
              This option causes only warning messages to be displayed. This can be useful when rkhunter is run via cron. Other options may
              be used to force other items of information to be displayed.

       –sk, –skip-keypress
              When  the  –check command option is used, after certain sections of tests, the user will be prompted to press the return key
              in order to continue. This option disables that feature, and rkhunter will run until all the tests have completed.

         


Install and configure rkhunter for improved security on a PCI DSS Linux / BSD servers with no access to Internet
As rkhunter check, can be pretty annoying and ask you to press keypresses multiple times and spit you a lot of unnecessery data a very good useful option arguments are:

–rwo and –sk

# rkhunter -c –rwo –sk
Warning: The SSH and rkhunter configuration options should be the same:
         SSH configuration option 'PermitRootLogin': yes
         Rkhunter configuration option 'ALLOW_SSH_ROOT_USER': no


Fix eth changing network interface names from new Linux naming scheme ens, eno, em1 to legacy eth0, eth1, eth2 on CentOS Linux

Sorry for really late reply.

perhaps you have to create it or rename the ifcfg-eno1 to ifcfg-eth1 or you have some old ifcfg-enp1s0f0 or ifcfg-eno still under /etc/sysconfig/network-scripts/ interfering


How to RPM update Hypervisors and Virtual Machines running Haproxy High Availability cluster on KVM, Virtuozzo without a downtime on RHEL / CentOS Linux
if you happen to be missing versionlock plugin and you need to get use of it

yum versionlock capabilities

You will have to install yum-utils package:

For example on CentOS 8 Linux, to enable the yum versionlock plugiun

yum install yum-utils.noarch


How to log every Linux executed command by every running system program to separte log via rsyslog for better server Security and audit trails

In case if by default log is not configured for snoopy,
these are default output locations on various Linux distributions:

Distribution Snoopy output location Notes
CentOS /var/log/secure  
Debian /var/log/auth.log  
Ubuntu /var/log/auth.log  
(others) /var/log/messages (potentially, could be elsewhere)

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