Note: This will only remove docker images without a tag, but not all images not associated to a running or stopped container. See our post on How to automatically cleanup (prune) docker images daily in case this is not the desired behaviour.
docker image prune provides an easy way to remove “unused” (i.e. untagged) docker images from a system and hence fixes or significantly delays docker eating up all your disk space on.
I created a systemd-timer based daily prune routine using TechOverflow’s Simple systemd timer generator.
Quick install using
wget -qO- https://techoverflow.net/scripts/install-cleanup-docker.sh | sudo bash
This is the script which automatically creates & installs both systemd config files.
#!/bin/sh # This script installs automated docker cleanup via "docker image prune" # onto systemd-based systems. # It requires that docker is installed properly cat >/etc/systemd/system/PruneDocker.service <<EOF [Unit] Description=PruneDocker [Service] Type=oneshot ExecStart=/usr/bin/docker image prune -f WorkingDirectory=/tmp EOF cat >/etc/systemd/system/PruneDocker.timer <<EOF [Unit] Description=PruneDocker [Timer] OnCalendar=daily Persistent=true [Install] WantedBy=timers.target EOF # Enable and start service systemctl enable PruneDocker.timer && sudo systemctl start PruneDocker.timer
To view logs, use
journalctl -xfu PruneDocker.service
To view the status, use
sudo systemctl status PruneDocker.timer
To immediately cleanup your docker images, use
sudo systemctl start PruneDocker.service