How to Automate Docker Cleanup on a Linux VPS

Create /etc/systemd/system/docker-cleanup.timer:

[Unit]
Description=Schedule Docker cleanup

[Timer]
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timers.target

Load and enable the timer:

sudo systemctl daemon-reload
sudo systemctl enable --now docker-cleanup.timer
sudo systemctl status docker-cleanup.timer
sudo systemctl list-timers docker-cleanup.timer

Persistent=true allows systemd to run the service after the machine returns from a period when it was powered off. The service requires Docker and starts after the Docker service, reducing failures during boot. A daily trigger does not mean every object is deleted daily: the until=168h filter still protects anything newer than the retention window.

Inspect execution and failures with:

sudo journalctl -u docker-cleanup.service
sudo journalctl -u docker-cleanup.service --since '7 days ago'
sudo systemctl start docker-cleanup.service

Run the service manually first on a staging VPS or during a maintenance window. Confirm the output, verify that the intended rollback images remain, and only then leave the timer enabled.

Use cron when systemd is not your scheduler

A root crontab can run the same root-owned wrapper. Edit it with sudo crontab -e and choose a quiet maintenance time:

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30 03 * * * /usr/local/sbin/docker-cleanup >>/var/log/docker-cleanup.log 2>&1

This example runs daily at 03:30 in the host's local time. Make the log root-readable, monitor its growth and configure normal host log rotation; otherwise the cleanup log can become another source of disk usage. Cron supplies no dependency ordering, so ensure the Docker daemon is normally available at that time and investigate non-zero exits rather than ignoring them.

Target the object that is actually consuming space

Stopped containers

Use docker container prune --force --filter 'until=168h' when stopped containers are the only concern. It is narrower than a system prune and supports age and label filters. Running containers are not stopped or deleted by this command.

Images

Use docker image prune --all --force --filter 'until=240h' for an image-focused policy. The --all switch removes images not referenced by any container, so retain a window that covers your rollback plan. Without --all, image pruning is limited to dangling images.

Build cache

If docker system df -v shows build cache as the dominant reclaimable category, use docker buildx prune instead of widening image deletion. Buildx supports bounded policies using max-used-space, min-free-space and reserved-space. Those controls let you preserve a reserve for builds while reclaiming cache when a filesystem approaches its limit. Check the installed buildx help for exact syntax and units before putting it in a timer.

Networks

Unused networks are included in the conservative system prune. If a network is unexpectedly removed, inspect whether any container was attached at the time; active container attachments prevent it from being considered unused. Network cleanup normally has little rollback value compared with image retention, but a deployment that creates networks ahead of a release should account for the age filter.

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Handle volumes as persistent data, not cache

List volumes and classify them before any volume prune:

docker volume ls

Named volumes often hold database files, media or application state. Docker leaves them out of ordinary docker system prune precisely because “unused” at this instant does not prove that the data is disposable. A service may be stopped for maintenance while its volume remains the only copy of its data.

docker volume prune --force is limited to unused anonymous local volumes. The --all form broadens the operation to unused named volumes where supported by the installed API and CLI. Treat that as a destructive policy decision: verify ownership, confirm a recent restorable backup and apply labels or an explicit allow-list before scheduling it. Do not infer safety from a volume's lack of current attachments.

Use labels and retention to protect rollback material

Age alone cannot tell Docker that an unreferenced image is reserved for rollback. If your deployment tooling applies stable labels, use Docker's positive or negative label filters to express which objects may be pruned. For example, a policy can exclude objects carrying a keep label and allow cleanup of objects carrying an environment or lifecycle label. Check the relevant prune command's help for the supported label-filter syntax, then test it against a non-production copy of the inventory.

Keep the retention window at least as long as the rollback promise you make to operators. If releases occur every two weeks but the job keeps only seven days of unreferenced images, the previous release may be gone before the next release is proven stable. Conversely, retaining many large images on a small disk may require a registry pull during rollback; document that dependency and monitor registry availability.

Do not confuse Docker-object cleanup with log rotation

Pruning images and containers does not remove logs produced by a running container. Docker's logging guidance warns that excessive log output can fill a filesystem independently of Docker objects. Choose and configure an appropriate logging driver or rotation policy for your deployment, and monitor the host filesystem as a whole. A successful prune cannot recover space consumed by unrotated container logs.

Monitor results and failure modes

• No space was reclaimed: inspect docker system df -v. The remaining data may be in active containers, referenced images, named volumes, build cache outside the selected scope or logs.
• A rollback image disappeared: the job likely used --all or a filter that did not encode your keep rule. Restore the image from the registry, lengthen retention and add labels or an allow-list.
• The timer fails with a Docker connection error: check systemctl status docker, the service's After/Requires relationship and the absolute Docker path. Review the journal for permission errors.
• Cron reports “command not found”: use the absolute paths shown in the wrapper and confirm the crontab belongs to the account with daemon access.
• Builds become slower after cleanup: cache pruning removed reusable layers. Bound buildx cache with a reserved-space or maximum-space policy rather than repeatedly deleting all cache.
• The disk still fills between runs: shorten the schedule only after identifying the source. Check logs, volume growth and application data; increasing prune frequency will not fix a non-Docker consumer.

Set an alert for low free space and for a failed cleanup service. Review the before-and-after reports and disk trend, not merely the scheduler's “success” status. A command can complete successfully while reclaiming little space because no eligible objects existed.

A rollout checklist

1. Run docker system df -v, docker ps -a, docker image ls and docker volume ls as the scheduler identity.
2. Write down the rollback window and classify every named volume.
3. Start with docker system prune --force --filter 'until=168h'; do not add --all or --volumes by habit.
4. Save the wrapper as /usr/local/sbin/docker-cleanup, use /usr/bin/docker, and set root ownership and restrictive permissions.
5. Run it interactively on staging or during a maintenance window and compare the two disk reports.
6. Schedule it with a systemd timer or root cron, then inspect logs after the first run.
7. Add a separate, bounded buildx policy only if build cache is the dominant consumer.
8. Alert on free-space thresholds and failed jobs, and revisit retention whenever deployment or rollback practice changes.

The practical default is therefore a daily or weekly, root-owned, age-filtered system prune that leaves volumes alone. Expand the scope only when measurements show a specific category needs attention and your rollback and backup policies explicitly allow the deletion.

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