• docker ps
• docker list
• docker inspect
  • show docker image
  • show entrypoint
  • list environment
  • check mounts
  • log path
  • get full container ID
  • check repo tag
• docker stats
• docker system
  • df
  • events
  • prune
• ps format

[!TIP|label:references:]

• Format command and log output
• Format the output (--format)

docker ps

• original

  $ docker ps -a --filter 'status=exited' | head -2
  CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS               NAMES
  5e5f59e3aff3        3129a2ca29d7        "/configmap-reload -…"   2 months ago        Exited (137) 2 months ago                       k8s_rules-configmap-reloader_prometheus-k8s-0_monitoring_aeba5164-dda4-11ec-b785-0cc47aff0b92_1
  

• via foramt

  $ docker ps -f 'status=exited' --format 'table {{.ID}}\t{{.Image}}\t{{.Command}}\t{{.RunningFor}}\t{{.Status}}\t{{.Ports}}\t{{.Names}}' | head -2
  CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS               NAMES
  5e5f59e3aff3        3129a2ca29d7        "/configmap-reload -…"   2 months ago        Exited (137) 2 months ago                       k8s_rules-configmap-reloader_prometheus-k8s-0_monitoring_aeba5164-dda4-11ec-b785-0cc47aff0b92_1
  

docker list

• sort by image size

  $ docker images --format "{{.ID}}\t{{.Size}}\t{{.Repository}}:{{.Tag}}" | sort -k 2 -hr

docker inspect

show docker image

$ docker inspect 5b4299c238e5 -f '{{ .Config.Image }}'

show entrypoint

$ docker inspect -f "{{.Path}} {{.Args}} ({{.Id}})" $(docker ps -a -q)

• or list only

  $ docker inspect -f "{{.Path}} {{.Args}} ({{.Id}})" <name>
  

• i.e.:

  $ docker inspect -f "{{.Path}} {{.Args}} ({{.Id}})" bf6f6d166b88
  /usr/bin/tini [-- /usr/local/bin/jenkins.sh] (bf6f6d166b88ed9695b89d859ddc1feb7d2deaf07c64352ad479645b707e0157)
  

list environment

$ docker inspect \
         --format='{{ .Name }}{{ printf "\n" }}{{ range .Config.Env }}{{ printf "\n\t" }}{{ printf . }}{{ end }}' \
         <containerID>

check mounts

$ docker inspect \
         --format='{{ .Name }}{{ printf "\n" }}{{ range .HostConfig.Binds }}{{ printf "\n\t" }}{{ printf . }}{{ end }}' \
         <containerID>

• i.e.:

  $ docker inspect \
           --format='{{ .Name }}{{ printf ":\n" }}{{ range .HostConfig.Binds }}{{ printf "\n\t" }}{{ printf . }}{{ end }}' \
           <containerID>
  /k8s_jnlp-s31sk-1rvd0_060d5260-8b42-11ed-9c0f-b883034b82d0_0:
  
    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/volumes/kubernetes.io~empty-dir/workspace-volume:/home/marslo
    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/volumes/kubernetes.io~secret/default-token-m6bqf:/var/run/secrets/kubernetes.io/serviceaccount:ro
    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/etc-hosts:/etc/hosts
    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/containers/jnlp/1d0c9319:/dev/termination-log
  

• or

  $ docker inspect \
          -f '{{ .Name }}{{ printf ":\n" }}{{ range .Mounts }}{{ printf "\n\t" }}{{ .Type }}{{ printf "\t" }}{{ if eq .Type "bind" }}{{ .Source }}{{ end }}{{ .Name }} => {{ .Destination }}{{ end }}{{ printf "\n" }}' \
          8e59c4dd2f65
  /k8s_jnlp-s31sk-1rvd0_060d5260-8b42-11ed-9c0f-b883034b82d0_0:
  
    bind    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/volumes/kubernetes.io~secret/default-token-m6bqf => /var/run/secrets/kubernetes.io/serviceaccount
    volume  6c18dbf9b131a9fb245fe896a56b4f4db33f3f32eb1f2b3fcc10c5e50baf7e4f => /home/devops/.jenkins
    bind    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/volumes/kubernetes.io~empty-dir/workspace-volume => /home/devops
    bind    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/etc-hosts => /etc/hosts
    bind    /var/lib/kubelet/pods/060d5260-8b42-11ed-9c0f-b883034b82d0/containers/jnlp/1d0c9319 => /dev/termination-log
    volume  69c10d1602dc0af1ad305f21ec74f5c568a735c18c64b7b0cb5e04120159e2bd => /home/devops/.ssh
    volume  02668c553b25d1b3f5ba51c85885fab6abf74296a4c0393d35006737d543a174 => /home/devops/agent
  

• or

  $ docker container inspect \
           -f '{{ range .Mounts }}{{ .Type }} : {{ .Source }}:{{ .Destination }}{{ println }}{{  end  }}' \
           <containerID>
  

log path

[!TIP] how to redirect docker logs to a single file

$ docker inspect --format='{{.LogPath}}' containername

get full container ID

$ docker inspect --format="{{.Id}}" d40df87b2f87
d40df87b2f87261152d2541b870c6b801c031f8df969e4bd3e9b3c607e6c1698

check repo tag

$ docker images -q -a | xargs docker inspect --format='{{.Id}}{{range $rt := .RepoTags}} {{$rt}} {{end}}'

docker stats

$ docker stats --format "table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}" <CONTAINER_ID>

# or show all
$ docker ps -q | xargs  docker stats --no-stream

docker system

df

$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          5         1         9.81GB    8.384GB (85%)
Containers      1         0         0B        0B
Local Volumes   4449      4         172.2GB   156.7GB (90%)
Build Cache     0         0         0B        0B

events

$ docker system events --since '24h'

prune

$ docker system prune --all
WARNING! This will remove:
        - all stopped containers
        - all networks not used by at least one container
        - all dangling images
        - all build cache
Are you sure you want to continue? [y/N] y

# prune volume only
$ docker system prune --volumes

ps format

$ docker ps -a --format 'CONTAINER ID : {{.ID}} | Name: {{.Names}} | Image:  {{.Image}} |  Ports: {{.Ports}}'

• id and command

  $ docker ps --no-trunc --format "{{.ID}}: {{.Command}}"

• id, image and commands

  $ docker ps --no-trunc --format "{{.ID}}: {{.Command}}: {{.Image}}"

• log path

  [!NOTE] how to redirect docker logs to a single file

  $ docker inspect --format='{{.LogPath}}' containername

• with table

  $ docker ps --format "table {{.Image}}\t{{.Names}}\t{{.Ports}}\t{{.Status}}"