A simple docker container and image garbage collection script.
- Containers that exited more than an hour ago are removed.
- Images that don't belong to any remaining container after that are removed.
Although docker normally prevents removal of images that are in use by
containers, we take extra care to not remove any image tags (e.g. ubuntu:14.04,
busybox, etc) that are in use by containers. A naive docker rmi $(docker images -q)
will leave images stripped of all tags, forcing docker to re-pull the
repositories when starting new containers even though the images themselves are
still on disk.
This script is intended to be run as a cron job.
Build the debian package:
$ apt-get install git devscripts
$ git clone https://github.com/spotify/docker-gc.git
$ cd docker-gc
$ debuild -us -uc -b
$ dpkg -i ../docker-gc_0.0.1_all.deb
This installs the docker-gc
script into /usr/sbin
and drops a docker-gc
cron
file into /etc/cron.hourly/
.
To use the script manually, run docker-gc
.
The script can also be run in "reporting" mode, where it simply outputs a list of containers that would have been reaped. To invoke this mode, run docker-gc -r
.
There can be images that are large that serve as a common base for
many application containers, and as such, make sense to pin to the
machine, as many derivative containers will use it. This can save
time in pulling those kinds of images. There may be other reasons to
exclude images from garbage collection. To do so, create
/etc/docker-gc-exclude
, or if you want the file to be read from
elsewhere, set the EXCLUDE_FROM_GC
environment variable to its
location. This file can contain image name patterns (in the grep
sense), one per line, such as spotify/cassandra:latest
or it can
contain image ids (truncated to the length shown in docker images
which is 12.
An example excludes file might contain:
spotify/cassandra:latest
9681260c3ad5