show info

• 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

PLACEHOLDER	DESCRIPTION
.ID	Container ID
.Image	Image ID
.Command	Quoted command
.CreatedAt	Time when the container was created.
.RunningFor	Elapsed time since the container was started.
.Ports	Exposed ports.
.State	Container status (for example; "created", "running", "exited").
.Status	Container status with details about duration and health-status.
.Size	Container disk size.
.Names	Container names.
.Labels	All labels assigned to the container.
.Label	Value of a specific label for this container. For example '{{.Label "com.docker.swarm.cpu"}}'
.Mounts	Names of the volumes mounted in this container.
.Networks	Names of the networks attached to this container.

• 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

reference:

• docker inspect

• See full command of running/stopped container in Docker

• Docker remove TAG images

• Return container settings in JSON format

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

reference:

• Monitor the Resource Usage of Docker Containers

• See Memory and CPU Usage for All Your Docker Containers

• How to See Memory and CPU Usage for All Your Docker Containers (on CentOS 6)

• How to Monitor the Resource Usage of Docker Containers

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

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

docker status

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}}"