Difference between revisions of "ClamAV - Reset Defs DB"

(Adding Article Footer)
m (Adding category)
Line 47: Line 47:
 
[[Category:Certified]]
 
[[Category:Certified]]
 
[[Category:Troubleshooting]]
 
[[Category:Troubleshooting]]
 +
[[Category:ZCS 5.0]]

Revision as of 19:42, 24 November 2009


Sometimes ClamAV will download a virus update, and the update will not download correctly. This causes an error in its checksum. If this happens, ClamAV usually goes down and the system suspends delivery. Downloading fresh definition files can correct this problem.

Symptoms

You will experience the following symptoms if ClamAV fails to correctly download a virus update:

The definitions are corrupt if in /var/log/zimbra.log:

  • ClamAV isn't running
  • postfix/qmgr errors out at delivery temporarily suspended

And in /opt/zimbra/log/clamd.log:

  • There are log error messages, like malformed database
  • zmclamdctl status shows clamd as down.

The following symptoms may occur if you stop & restart Zimbra services (using zmcontrol stop and zmcontrol start):

  • Antivirus may fail to start with the error (among others) clamd failed to start

Note: The WARNING: Your ClamAV installation is OUTDATED! error may also appear, but this is not indicative of a corrupt clamd database. This error simply occurs because ClamAV has a more recent release available than the one that ships with Zimbra. Updating your ClamAV installation to a version not included with a released ZCS product is not recommended and is not supported. Zimbra updates the ClamAV engine to latest with every release of ZCS. Users who wish to upgrade ClamAV independently from ZCS at their own risk can find directions here: ClamAV - Updating Version Out of cycle updates RFE is Bug 15137

Note: ClamAV Virus definitions update automatically every 2h by default (zimbraVirusDefinitionsUpdateFrequency attribute).

Fix

To fix this issue, you can delete the definitions and try again:

su - zimbra
mkdir /tmp/clamdb

(in versions prior to 5.0.3)

mv /opt/zimbra/clamav/db/* /tmp/clamdb

(in version 5.0.3 or later)

mv /opt/zimbra/data/clamav/db/* /tmp/clamdb
zmprov ms `zmhostname` +zimbraServiceEnabled antivirus
/opt/zimbra/clamav/bin/freshclam --config-file=/opt/zimbra/conf/freshclam.conf 
zmantivirusctl stop
zmantivirusctl start

Note: zmantivirusctl incorporates zmclamdctl/zmamavidsctl/zmmtaconfigctl though you can just restart ClamAV individually.

Verify

Verify by running:

/opt/zimbra/clamav/bin/clamscan -d /opt/zimbra/data/clamav/db/

In releases prior to 5.0.3, this command will be:

/opt/zimbra/clamav/bin/clamscan -d /opt/zimbra/clamav/db/
Verified Against: ZCS 5.0.6 Date Created: 6/23/08
Article ID: https://wiki.zimbra.com/index.php?title=ClamAV_-_Reset_Defs_DB Date Modified: 2009-11-24



Try Zimbra

Try Zimbra Collaboration with a 60-day free trial.
Get it now »

Want to get involved?

You can contribute in the Community, Wiki, Code, or development of Zimlets.
Find out more. »

Looking for a Video?

Visit our YouTube channel to get the latest webinars, technology news, product overviews, and so much more.
Go to the YouTube channel »

Jump to: navigation, search