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#!/bin/bash
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# Copyright (c) 2014 Spotify AB.
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#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# This script attempts to garbage collect docker containers and images.
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# Containers that exited more than an hour ago are removed.
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# Images that have existed more than an hour and are not in use by any
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# containers are removed.
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# Note: Although docker normally prevents removal of images that are in use by
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# containers, we take extra care to not remove any image tags (e.g.
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# ubuntu:14.04, busybox, etc) that are used by containers. A naive
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# "docker rmi `docker images -q`" will leave images stripped of all tags,
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# forcing users to re-pull the repositories even though the images
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# themselves are still on disk.
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# Note: State is stored in $STATE_DIR, defaulting to /var/lib/docker-gc
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set -o nounset
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set -o errexit
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GRACE_PERIOD_SECONDS=${GRACE_PERIOD_SECONDS:=3600}
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STATE_DIR=${STATE_DIR:=/var/lib/docker-gc}
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DOCKER=${DOCKER:=docker}
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PID_DIR=${PID_DIR:=/var/run}
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for pid in $(pidof -s docker-gc); do
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if [[ $pid != $$ ]]; then
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echo "[$(date)] : docker-gc : Process is already running with PID $pid"
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exit 1
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fi
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done
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trap "rm -f -- '$PID_DIR/dockergc'" EXIT
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echo $$ > $PID_DIR/dockergc
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EXCLUDE_FROM_GC=${EXCLUDE_FROM_GC:=/etc/docker-gc-exclude}
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if [ ! -f "$EXCLUDE_FROM_GC" ]
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then
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EXCLUDE_FROM_GC=/dev/null
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fi
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EXCLUDE_CONTAINERS_FROM_GC=${EXCLUDE_CONTAINERS_FROM_GC:=/etc/docker-gc-exclude-containers}
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if [ ! -f "$EXCLUDE_CONTAINERS_FROM_GC" ]
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then
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EXCLUDE_CONTAINERS_FROM_GC=/dev/null
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fi
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EXCLUDE_IDS_FILE="exclude_ids"
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EXCLUDE_CONTAINER_IDS_FILE="exclude_container_ids"
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function date_parse {
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if date --utc >/dev/null 2>&1; then
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# GNU/date
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echo $(date -u --date "${1}" "+%s")
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else
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# BSD/date
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echo $(date -j -u -f "%F %T" "${1}" "+%s")
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fi
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}
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# Elapsed time since a docker timestamp, in seconds
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function elapsed_time() {
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# Docker 1.5.0 datetime format is 2015-07-03T02:39:00.390284991
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# Docker 1.7.0 datetime format is 2015-07-03 02:39:00.390284991 +0000 UTC
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utcnow=$(date -u "+%s")
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replace_q="${1#\"}"
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without_ms="${replace_q:0:19}"
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replace_t="${without_ms/T/ }"
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epoch=$(date_parse "${replace_t}")
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echo $(($utcnow - $epoch))
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}
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function compute_exclude_ids() {
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# Find images that match patterns in the EXCLUDE_FROM_GC file and put their
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# id prefixes into $EXCLUDE_IDS_FILE, prefixed with ^
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PROCESSED_EXCLUDES="processed_excludes.tmp"
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# Take each line and put a space at the beginning and end, so when we
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# grep for them below, it will effectively be: "match either repo:tag
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# or imageid". Also delete blank lines or lines that only contain
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# whitespace
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sed 's/^\(.*\)$/ \1 /' $EXCLUDE_FROM_GC | sed '/^ *$/d' > $PROCESSED_EXCLUDES
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# The following looks a bit of a mess, but here's what it does:
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# 1. Get images
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# 2. Skip header line
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# 3. Turn columnar display of 'REPO TAG IMAGEID ....' to 'REPO:TAG IMAGEID'
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# 4. find lines that contain things mentioned in PROCESSED_EXCLUDES
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# 5. Grab the image id from the line
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# 6. Prepend ^ to the beginning of each line
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# What this does is make grep patterns to match image ids mentioned by
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# either repo:tag or image id for later greppage
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$DOCKER images \
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| tail -n+2 \
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| sed 's/^\([^ ]*\) *\([^ ]*\) *\([^ ]*\).*/ \1:\2 \3 /' \
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| grep -f $PROCESSED_EXCLUDES 2>/dev/null \
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| cut -d' ' -f3 \
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| sed 's/^/^/' > $EXCLUDE_IDS_FILE
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}
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function compute_exclude_container_ids() {
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# Find containers matching to patterns listed in EXCLUDE_CONTAINERS_FROM_GC file
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# Implode their values with a \| separator on a single line
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PROCESSED_EXCLUDES=`cat $EXCLUDE_CONTAINERS_FROM_GC \
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| xargs \
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| sed -e 's/ /\|/g'`
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# The empty string would match everything
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if [ "$PROCESSED_EXCLUDES" = "" ]; then
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touch $EXCLUDE_CONTAINER_IDS_FILE
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return
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fi
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# Find all docker images
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# Filter out with matching names
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# and put them to $EXCLUDE_CONTAINER_IDS_FILE
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$DOCKER ps -a \
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| grep -E "$PROCESSED_EXCLUDES" \
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| awk '{ print $1 }' \
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| tr -s " " "\012" \
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| sort -u > $EXCLUDE_CONTAINER_IDS_FILE
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}
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# Change into the state directory (and create it if it doesn't exist)
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if [ ! -d "$STATE_DIR" ]
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then
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mkdir -p $STATE_DIR
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fi
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cd "$STATE_DIR"
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# Verify that docker is reachable
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$DOCKER version 1>/dev/null
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# List all currently existing containers
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$DOCKER ps -a -q --no-trunc | sort | uniq > containers.all
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# List running containers
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$DOCKER ps -q --no-trunc | sort | uniq > containers.running
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# compute ids of container images to exclude from GC
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compute_exclude_ids
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# compute ids of containers to exclude from GC
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compute_exclude_container_ids
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# List containers that are not running
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comm -23 containers.all containers.running > containers.exited
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# Find exited containers that finished at least GRACE_PERIOD_SECONDS ago
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echo -n "" > containers.reap.tmp
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cat containers.exited | while read line
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do
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EXITED=$(${DOCKER} inspect -f "{{json .State.FinishedAt}}" ${line})
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ELAPSED=$(elapsed_time $EXITED)
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if [[ $ELAPSED -gt $GRACE_PERIOD_SECONDS ]]; then
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echo $line >> containers.reap.tmp
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fi
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done
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# List containers that we will remove and exclude ids.
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cat containers.reap.tmp | sort | uniq | grep -v -f $EXCLUDE_CONTAINER_IDS_FILE > containers.reap || true
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# List containers that we will keep.
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comm -23 containers.all containers.reap > containers.keep
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# List images used by containers that we keep.
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# This may be both image id's and repo/name:tag, so normalize to image id's only
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cat containers.keep |
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xargs -n 1 $DOCKER inspect -f '{{.Config.Image}}' 2>/dev/null |
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sort | uniq |
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xargs -n 1 $DOCKER inspect -f '{{.Id}}' 2>/dev/null |
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sort | uniq > images.used
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# List images to reap; images that existed last run and are not in use.
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$DOCKER images -q --no-trunc | sort | uniq > images.all
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# Find images that are created at least GRACE_PERIOD_SECONDS ago
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echo -n "" > images.reap.tmp
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cat images.all | while read line
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do
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CREATED=$(${DOCKER} inspect -f "{{.Created}}" ${line})
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ELAPSED=$(elapsed_time $CREATED)
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if [[ $ELAPSED -gt $GRACE_PERIOD_SECONDS ]]; then
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echo $line >> images.reap.tmp
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fi
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done
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comm -23 images.reap.tmp images.used | grep -v -f $EXCLUDE_IDS_FILE > images.reap || true
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# Reap containers.
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xargs -n 1 $DOCKER rm --volumes=true < containers.reap &>/dev/null || true
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# Reap images.
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xargs -n 1 $DOCKER rmi < images.reap &>/dev/null || true
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Smaine Kahlouch