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# Show what would be removed first
docker system df

# Safe pruning — dangling (untagged) images only
docker image prune -f

# Aggressive — remove ALL unused images, not just dangling
docker image prune -a -f

# Stopped containers
docker container prune -f

# Build cache (newer Docker)
docker builder prune -af

# Everything not in use (most aggressive, most space recovered)
docker system prune -af --volumes

# Crontab entry for nightly cleanup
# 0 3 * * * docker system prune -af --filter "until=168h" >/var/log/docker-prune.log 2>&1