docker-gc.service

[Unit]
Description=jackil/docker-gc

[Service]
TimeoutStartSec=1200
ExecStartPre=/opt/bin/docker pull %n

# This service accesses docker on the host, so we map the socket into it.
# We are setting the docker-gc to:
# 1. Execute every 12 hours
# 2. Keep disk usage of docker images below 80% of (total diskspace - 100Gb) // 100Gb is reserved for system files and log files
# 3. Delete least used images first by comparing image last touch date
ExecStart=/bin/bash -c "/opt/bin/docker run --rm --memory=128M -v /var/run/docker.sock:/var/run/docker.sock -e DOCKERGC_EXECUTION_INTERVAL_IN_MINUTES='720' -e DOCKERGC_RECYCLING_STRATEGY='ByDiskSpace' -e DOCKERGC_IMAGE_DELETION_ORDER='ByImageLastTouchDate' -e DOCKERGC_SIZE_LIMIT_IN_GIGABYTE=$$(freeDisk=$(df --output=size /var/lib/docker | awk 'FNR == 2 {print int(($1/1024/1024-100)*0.8)}'); if [[ $freeDisk -gt 0 ]]; then echo $freeDisk; else echo 0; fi) -e DOCKERGC_STATSD_LOGGER_ENABLED='True' %n"
ExecStop=/opt/bin/docker stop %n
RestartSec=5s
Restart=on-failure

[X-Fleet]
Global=true