GlusterFS Init Script and Puppet
The other day I had quite the head scratcher. I was setting up a new environment for a customer which included the usual suspects in a LAMP stack spread across a few virtual machines in an ESXi cluster. As the project is quite volatile in terms of requirements, amount of servers, server roles, location etc. I decided to start off using Puppet to make my life easier further down the road.
I got most of it set up, and got started on writing up the glusterfs Puppet module. Fairly straight forward, a few directories, configuration files and a mount point. Then I came to the Service declaration, and of course we want this to be running at all times, so I went on and wrote:
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expecting glusterfsd to be running shortly after I purposefully stopped it. But it didn’t. So I dove into puppet (Yay Ruby!) and deduced that the way it determines whether something is running or not is the return code of: /sbin/service servicename status
So a quick look in the init script which ships with glusterfs-server shows that it calls the stock init function “status” on glusterfsd, which is perfectly fine, but then it doesn’t exit with the return code from this function, it simply runs out of scope and exits with the default value of 0.
So to get around this, I made a quick change to the init script and used the return code from the “status” function (/etc/rc.d/init.d/functions on RHEL5) and exited with $?, and Puppet had glusterfsd running within minutes.
I couldn’t find anything when searching for this, so I thought I’d make a note of it here.