Question 1

How do I stop Docker GC from deleting my important containers?

Accepted Answer

Use the STICKY_LABEL feature: add a label like 'persistent_image=true' to your Dockerfile for the image, then set STICKY_LABEL in the configuration to protect it from deletion, as described in the README.

Question 2

Docker GC vs Docker's built-in prune commands: which is better for Swarm?

Accepted Answer

Docker GC is better for automated, scheduled cleanup in Docker Swarm clusters because it integrates natively with Swarm deployments. Docker prune commands are manual and don't handle Swarm-specific objects as seamlessly.

Question 3

Can Docker GC clean up old Docker images automatically?

Accepted Answer

No, Docker GC does not remove unused images by default; it only deletes containers, volumes, and networks. You must manage images separately or use other tools for image cleanup.

Question 4

How to deploy Docker GC on a single Docker host without Swarm?

Accepted Answer

Use the provided docker-compose.yml file, set the AGE and SLEEP environment variables to define cleanup thresholds and intervals, then run it as a regular Docker service.

Question 5

What happens if Docker GC deletes a volume still in use?

Accepted Answer

Docker GC uses standard Docker APIs to identify unused objects based on age, but misconfiguration could risk deleting active resources. Always test policies in a safe environment and use STICKY_LABEL for critical items.

Question 6

Is Docker GC compatible with Kubernetes?

Accepted Answer

No, Docker GC is designed specifically for Docker Swarm and standard Docker services; for Kubernetes, you'd need a different garbage collection tool tailored to its ecosystem.

Question 7

How to adjust the frequency of cleanup checks in Docker GC?

Accepted Answer

Set the SLEEP parameter in your deployment file using Go duration strings (e.g., '30m' for every 30 minutes) to control how often the service scans for unused objects.

docker_gc

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