ClamAV
zh-CN:ClamAV Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. Because ClamAV's main use is on file/mail servers for Windows desktops it primarily detects Windows viruses and malware.
Contents
Installation
ClamAV can be installed with package clamav, available in the Official Repositories.
Configuration
Whether you are going to use clamav as a daemon or use it as a simple file checker you need to comment out the line that contains the word Example, usually it is found at the beginning of /etc/clamav/freshclam.conf
and /etc/clamav/clamd.conf
files.
Starting the daemon
To start the daemon:
# systemctl start clamd
To start it automatically at boot:
# systemctl enable clamd
Also in /etc/conf.d/clamav
change the start options from "no" to "yes".
# change these to "yes" to start START_FRESHCLAM="yes" START_CLAMD="yes"
Updating database
Edit the below file and comment out the line saying "Example"
# vim /etc/clamav/freshclam.conf # Comment or remove the line below. #Example
Update the virus definitions with:
# freshclam
The database files are saved in:
/var/lib/clamav/daily.cvd /var/lib/clamav/main.cvd
Scan for Viruses
clamscan
can be used to scan certain files, home directory, or an entire system:
$ clamscan myfile $ clamscan -r -i /home $ clamscan -r -i --exclude-dir=^/sys\|^/proc\|^/dev /
If you would like clamscan
to remove the infected file use the --remove
option in the command.
Troubleshooting
If you get the following messages after running freshclam:
WARNING: Clamd was NOT notified: Cannot connect to clamd through /var/lib/clamav/clamd.sock connect(): No such file or directory
Add a sock file for clamav:
# touch /var/lib/clamav/clamd.sock # chown clamav:clamav /var/lib/clamav/clamd.sock
Then, edit /etc/clamav/clamd.conf
– uncomment this line:
LocalSocket /var/lib/clamav/clamd.sock
Save the file and restart the daemon systemctl restart clamd
If you get the next error when starting the daemon:
LibClamAV Error: cli_loaddb(): No supported database files found in /var/lib/clamav ERROR: Not supported data format
Run freshclam as root:
# freshclam -v
If you get a:
# can't create temporary directory
error, along with a 'HINT' containing a UID and a GID number.
Do the following:
# chown UID:GID /var/lib/clamav & chmod 755 /var/lib/clamav
# ex: chown 64:64