cheatsheets/docker.md

---
title: Docker CLI
category: Devops
---

Manage images
-------------

### `docker build`

```yml
docker build [options] .
  -t "app/container_name"    # name
  --build-arg APP_HOME=$APP_HOME    # Set build-time variables
```

Create an `image` from a Dockerfile.


### `docker run`

```yml
docker run [options] IMAGE
  # see `docker create` for options
```

#### Example

```
$ docker run -it debian:buster /bin/bash
```
Run a command in an `image`.

Manage containers
-----------------

### `docker create`

```yml
docker create [options] IMAGE
  -a, --attach               # attach stdout/err
  -i, --interactive          # attach stdin (interactive)
  -t, --tty                  # pseudo-tty
      --name NAME            # name your image
  -p, --publish 5000:5000    # port map (host:container)
      --expose 5432          # expose a port to linked containers
  -P, --publish-all          # publish all ports
      --link container:alias # linking
  -v, --volume `pwd`:/app    # mount (absolute paths needed)
  -e, --env NAME=hello       # env vars
```

#### Example

```
$ docker create --name app_redis_1 \
  --expose 6379 \
  redis:3.0.2
```

Create a `container` from an `image`.

### `docker exec`

```yml
docker exec [options] CONTAINER COMMAND
  -d, --detach        # run in background
  -i, --interactive   # stdin
  -t, --tty           # interactive
```

#### Example

```
$ docker exec app_web_1 tail logs/development.log
$ docker exec -t -i app_web_1 rails c
```

Run commands in a `container`.


### `docker start`

```yml
docker start [options] CONTAINER
  -a, --attach        # attach stdout/err
  -i, --interactive   # attach stdin

docker stop [options] CONTAINER
```

Start/stop a `container`.


### `docker ps`

```
$ docker ps
$ docker ps -a
$ docker kill $ID
```

Manage `container`s using ps/kill.


### `docker logs`

```
$ docker logs $ID
$ docker logs $ID 2>&1 | less
$ docker logs -f $ID # Follow log output
```

See what's being logged in an `container`.


Images
------

### `docker images`

```sh
$ docker images
  REPOSITORY   TAG        ID
  ubuntu       12.10      b750fe78269d
  me/myapp     latest     7b2431a8d968
```

```sh
$ docker images -a   # also show intermediate
```

Manages `image`s.

### `docker rmi`

```yml
docker rmi b750fe78269d
```

Deletes `image`s.

## Clean up

### Clean all

```sh
docker system prune
```

Cleans up dangling images, containers, volumes, and networks (ie, not associated with a container)

```sh
docker system prune -a
```

Additionally remove any stopped containers and all unused images (not just dangling images)

### Containers

```sh
# Stop all running containers
docker stop $(docker ps -a -q)

# Delete stopped containers
docker container prune
```

### Images

```sh
docker image prune [-a]
```

Delete all the images

### Volumes

```sh
docker volume prune
```

Delete all the volumes

### Systems

```sh
docker system df
```

Show docker disk usage

```sh
docker system events
```

Get real time events from the server

```sh
docker system info
```

Display system-wide information



Also see
--------

 * [Getting Started](https://www.docker.io/gettingstarted/) _(docker.io)_