docker-library/wordpress — pull request #32 by SpencerCooley (2014-12-12 02:29:42+00:00)
Title: Container does not start when a non-graceful shutdown occurs on the host machine 

To recreate the problem you need to run the container like normal then do a hard power off of your server. When you turn the server back on the container will not start when you try to start it . This is due to a lingering .pid file

error:
httpd (pid 1) already running

In the entrypoint file I added some logic to remove the .pid file if the .pid file exists so that the pid file is removed when the container is started.