CFEngine can do wonders to keep a cluster in shape, but it can be very useful for a single server as well. Here is a configuration sample to monitor a few common services and restart them should they fail.
Here is how you can setup cfengine to monitor services on a server :
# cat cfagent.conf control: actionsequence = ( processes ) processes: "/usr/sbin/sshd" restart "/usr/sbin/sshd" "sendmail" restart "/usr/sbin/sendmail a-L sm-mta -C/etc/mail/localhost.cf -bd -q30m" "named" restart "named"
In the “control/actionsequence” part, we state that the “processes” part should be executed. Each statement in the processes part is composed of 2 lines :
- description of the running service (as it should appear if you run ps)
- how to restart it if it is not there
So if you put cfexecd -F to run periodically in your crontab, it CfEngine will ensure that the services you monitor are running.
PS : This is the 100th post 🙂