Setting up auto-updating
freshclam is the automatic database update tool for Clam AntiVirus.
It can work in two modes:
- interactive - on demand from command line
- daemon - silently in the background
freshclam is advanced tool: it supports scripted updates (instead
of transferring the whole CVD file at each update it only transfers the
differences between the latest and the current database via a special
script), database version checks through DNS, proxy servers (with
authentication), digital signatures and various error scenarios.
Quick test: run freshclam (as superuser) with no parameters
and check the output. If everything is OK you may create the log file in
/var/log (owned by clamav or another user
freshclam will be
# touch /var/log/freshclam.log
# chmod 600 /var/log/freshclam.log
# chown clamav /var/log/freshclam.log
Now you should edit the configuration file
and point the UpdateLogFile directive to the log file. Finally, to
freshclam in the daemon mode, execute:
# freshclam -d
The other way is to use the cron daemon. You have to add the
following line to the crontab of root or clamav user:
N * * * * /usr/local/bin/freshclam --quiet
to check for a new database every hour. N should be a
number between 3 and 57 of your choice. Please don't choose any multiple
of 10, because there are already too many clients using those time slots.
Proxy settings are only configurable via the configuration file and
freshclam will require strict permission settings for the config
HTTPProxyPassword is turned on.