PROBLEM
My ClamAV is not always running.

ENVIRONMENT

• On-Premise Server + WebMail Installations: Version 6.0 > Current Version

CAUSE
ClamAV, at times, fails and puts mail delivery and the processing of emails in the spool to a stop. This can be avoided by using ClamAV with supervise, a Unix tool that comes with the daemontools (http://cr.yp.to/daemontools.html) package, which basically checks if a service is running, then re-runs it if found inactive.
Implementing supervise with ClamAV is pretty straightforward. Just go through the following steps:

RESOLUTION

1. Download daemontools (http://cr.yp.to/daemontools/daemontools-0.76.tar.gz), and install it on your server
2. Add the following to your /etc/inittab file:
   

   SV:123456:respawn:/command/svscanboot

3. Create the ClamAV supervise log directory:
   

   % mkdir /usr/local/atmail/av/supervise/log

4. Create a file (with 755 permissions) called /usr/local/atmail/av/supervise/run, and place the following inside it:
   

   #!/bin/sh 
   /usr/local/atmail/av/sbin/clamd

5. Create a file (with 755 permissions) called /usr/local/atmail/av/supervise/log/run, and place the following inside it:
   

   #!/bin/sh
   exec setuidgid root multilog s100000 n20 ./clamd

6. Link the ClamAV supervice directory to the /service directory:
   

   % ln -s /usr/local/atmail/av/supervise/ /service/clamd

7. Run svstat for ClamAV:
   

   % svstat clamd

   This should then have ClamAV run alongside supervise, and auto-regenerate if found inactive.