# show info

* [docker ps](#docker-ps)
* [docker list](#docker-list)
* [docker inspect](#docker-inspect)
  * [show docker image](#show-docker-image)
  * [show entrypoint](#show-entrypoint)
  * [list environment](#list-environment)
  * [check mounts](#check-mounts)
  * [log path](#log-path)
  * [get full container ID](#get-full-container-id)
  * [check repo tag](#check-repo-tag)
* [docker stats](#docker-stats)
* [docker system](#docker-system)
  * [df](#df)
  * [events](#events)
  * [prune](#prune)
* [ps format](#ps-format)

> \[!TIP|label:references:]
>
> * [Format command and log output](https://docs.docker.com/config/formatting/)
> * [Format the output (--format)](https://docs.docker.com/engine/reference/commandline/ps/#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

    ```bash
    $ 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

    ```bash
    $ 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

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

### docker inspect

{% hint style="info" %}
> reference:
>
> * [docker inspect](https://docs.docker.com/engine/reference/commandline/inspect/)
> * [See full command of running/stopped container in Docker](https://stackoverflow.com/a/27380853/2940319)
> * [Docker remove TAG images](https://stackoverflow.com/a/33913711/2940319)
> * [Return container settings in JSON format](https://megamorf.gitlab.io/2021/03/14/return-container-settings-in-json-format/)
{% endhint %}

#### show docker image

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

#### show entrypoint

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

*   or list only

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

    *   i.e.:

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

#### [list environment](https://stackoverflow.com/a/43875774/2940319)

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

#### [check mounts](https://stackoverflow.com/a/68096235/2940319)

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

*   i.e.:

    ```bash
    $ 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

    ```bash
    $ 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

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

#### [log path](https://stackoverflow.com/a/41147654/2940319)

> \[!TIP] [how to redirect docker logs to a single file](https://www.scalyr.com/blog/how-to-redirect-docker-logs-to-a-single-file)

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

#### [get full container ID](https://forums.docker.com/t/how-to-get-a-full-id-of-a-certain-container/2418/3)

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

#### [check repo tag](https://stackoverflow.com/a/33913711/2940319)

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

### docker stats

{% hint style="info" %}
> reference:
>
> * [Monitor the Resource Usage of Docker Containers](https://www.cloudsavvyit.com/13715/how-to-monitor-the-resource-usage-of-docker-containers/)
> * [See Memory and CPU Usage for All Your Docker Containers](https://dev.to/rubberduck/how-to-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)](https://dev.to/rubberduck/how-to-see-memory-and-cpu-usage-for-all-your-docker-containers)
> * [How to Monitor the Resource Usage of Docker Containers](https://www.howtogeek.com/devops/how-to-monitor-the-resource-usage-of-docker-containers/)
{% endhint %}

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

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

![docker status](https://1999659500-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MHqOSW6on5cHbtwcSH6%2Fuploads%2Fgit-blob-3ba2ba8da9b6154af22e23f976291f4c4ddcf27a%2Fdocker-stat-resource-1.gif?alt=media)

### docker system

#### [df](https://docs.docker.com/engine/reference/commandline/system_df/)

```bash
$ 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](https://docs.docker.com/engine/reference/commandline/system_events/)

```bash
$ docker system events --since '24h'
```

#### [prune](https://docs.docker.com/engine/reference/commandline/system_prune/)

```bash
$ 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](https://docs.docker.com/engine/reference/commandline/ps/#formatting)

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

*   id and command

    ```bash
    $ docker ps --no-trunc --format "{{.ID}}: {{.Command}}"
    ```
*   id, image and commands

    ```bash
    $ docker ps --no-trunc --format "{{.ID}}: {{.Command}}: {{.Image}}"
    ```
*   [log path](https://stackoverflow.com/a/41147654/2940319)

    > \[!NOTE] [how to redirect docker logs to a single file](https://www.scalyr.com/blog/how-to-redirect-docker-logs-to-a-single-file)

    ```bash
    $ docker inspect --format='{{.LogPath}}' containername
    ```
*   [with table](https://stackoverflow.com/q/34748747/2940319)

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