PID File Cleanup

[pioto]

Hi,

It seems that, if the container dies unexpectedly (e.g. power loss), it will not restart properly.

The root cause seems to be some PID files left in /opt/graphite/storage/, specifically carbon-cache-a.pid.

It seems that the PID checker code is not robust enough to know that the process died, so it refuses to start it up again.

Since we're running in a Docker container, perhaps an earlier part of the /etc/my_init.d/01_conf_init.sh file could remove those PID files?

[mpareja]

For people using volume mounts on the storage directory this further complicates things. It can prevent carbon-cache from starting up on a newly launched container because the PID files from previously launches remain.