mookjp/pool — pull request #31 by ainoya (2014-09-19 07:27:19+00:00)
Title: Add limitation of max running containers at the same time

I implemented this feature with cron service.
cron executes `/etc/cron.d/limit_containers` script every minute. If the number of running containers is up to `MAX_CONTAINERS`, then the script remove old containers in order of the old date.