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Cleanup unused Docker images and containers
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#!/bin/sh | |
# Cleanup docker files: untagged containers and images. | |
# | |
# Use `docker-cleanup -n` for a dry run to see what would be deleted. | |
untagged_containers() { | |
# Print containers using untagged images: $1 is used with awk's print: 0=line, 1=column 1. | |
# NOTE: "[0-9a-f]{12}" does not work with GNU Awk 3.1.7 (RHEL6). | |
# Ref: https://github.com/blueyed/dotfiles/commit/a14f0b4b#commitcomment-6736470 | |
docker ps -a | tail -n +2 | awk '$2 ~ "^[0-9a-f]+$" {print $'$1'}' | |
} | |
untagged_images() { | |
# Print untagged images: $1 is used with awk's print: 0=line, 3=column 3. | |
# NOTE: intermediate images (via -a) seem to only cause | |
# "Error: Conflict, foobarid wasn't deleted" messages. | |
# Might be useful sometimes when Docker messed things up?! | |
# docker images -a | awk '$1 == "<none>" {print $'$1'}' | |
docker images | tail -n +2 | awk '$1 == "<none>" {print $'$1'}' | |
} | |
# Dry-run. | |
if [ "$1" = "-n" ]; then | |
echo "=== Containers with uncommitted images: ===" | |
untagged_containers 0 | |
echo | |
echo "=== Uncommitted images: ===" | |
untagged_images 0 | |
exit | |
fi | |
if [ -n "$1" ]; then | |
echo "Cleanup docker files: remove untagged containers and images." | |
echo "Usage: ${0##*/} [-n]" | |
echo " -n: dry run: display what would get removed." | |
exit 1 | |
fi | |
# Remove containers with untagged images. | |
echo "Removing containers:" >&2 | |
untagged_containers 1 | xargs --no-run-if-empty docker rm --volumes=true | |
# Remove untagged images | |
echo "Removing images:" >&2 | |
untagged_images 3 | xargs --no-run-if-empty docker rmi |
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