Docker: Display system-wide information and Go templates to manipulate the output format

docker_flags.md

• Search official images for desired : docker search --format "table {{.Name}}\t{{.StarCount}}\t{{.IsOfficial}}" <IMAGE>

• Output image name and tag: docker images --format '{{.Repository}} and {{.Tag}}'

• Output image name, tag and elapsed time + timestamp since the image has been created: docker images --format "{{.Repository}}:{{.Tag}} {{.CreatedSince}} --> {{.CreatedAt}}"

• Inspect Cmd for desired : docker inspect -f '{{.Config.Cmd}}' <IMAGE>

• Inspect Entrypoint for desired : docker inspect -f '{{.Config.Entrypoint}} <IMAGE>'

• Inspect attached containers to bridge network: docker inspect network bridge --format "{{json .Containers }}"

• Inspect storage: docker info -f 'Storage drive: {{.Driver}} and storage path {{.DockerRootDir}}'

• Inspect container runtimes: docker system info --format "{{.Runtimes}} {{.DefaultRuntime}}"

• containers resource usage

# docker stats [OPTIONS] [CONTAINER...]
docker stats --no-stream

• check the container runtimes

docker system info
docker system info --format "Runtimes:  {{.Runtimes}}  with default {{ .DefaultRuntime }}"

• check root directory for Docker storage, defaults to /var/lib/docker

docker system info -f '{{ .DockerRootDir}}'

• remove dangling/untagged images and not referenced by a container

docker rm $(docker ps -aq)
docker image prune -a

• debug Docker with systemctl/service and journalctl

systemctl status docker
systemctl daemon-reload
systemctl start docker
service docker restart
journalctl -xeu docker.service
journalctl -u docker

• get events

docker events --filter event=restart --since=60m
docker events --filter event=restart --since=60m > events.log 2>&1

• show docker disk usage docker system df