> For the complete documentation index, see [llms.txt](https://smadi0x86-blog.gitbook.io/smadi0x86-playground/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://smadi0x86-blog.gitbook.io/smadi0x86-playground/cloud-native/docker/cheatsheet.md).

# Cheatsheet

## <mark style="color:red;">Check Version</mark> <a href="#check-version" id="check-version"></a>

* [`docker version`](https://docs.docker.com/engine/reference/commandline/version/) shows which version of docker you have running.

## <mark style="color:red;">Containers</mark> <a href="#containers" id="containers"></a>

### <mark style="color:yellow;">**Lifecycle**</mark>

* ​[`docker create`](https://docs.docker.com/engine/reference/commandline/create) creates a container but does not start it.
* ​[`docker rename`](https://docs.docker.com/engine/reference/commandline/rename/) allows the container to be renamed.
* ​[`docker run`](https://docs.docker.com/engine/reference/commandline/run) creates and starts a container in one operation.
* ​[`docker rm`](https://docs.docker.com/engine/reference/commandline/rm) deletes a container.
* ​[`docker update`](https://docs.docker.com/engine/reference/commandline/update/) updates a container's resource limits.

### <mark style="color:yellow;">**Starting and Stopping**</mark>

* ​[`docker start`](https://docs.docker.com/engine/reference/commandline/start) starts a container so it is running.
* ​[`docker stop`](https://docs.docker.com/engine/reference/commandline/stop) stops a running container.
* ​[`docker restart`](https://docs.docker.com/engine/reference/commandline/restart) stops and starts a container.
* ​[`docker pause`](https://docs.docker.com/engine/reference/commandline/pause/) pauses a running container, "freezing" it in place.
* ​[`docker unpause`](https://docs.docker.com/engine/reference/commandline/unpause/) will unpause a running container.
* ​[`docker wait`](https://docs.docker.com/engine/reference/commandline/wait) blocks until running container stops.
* ​[`docker kill`](https://docs.docker.com/engine/reference/commandline/kill) sends a SIGKILL to a running container.
* ​[`docker attach`](https://docs.docker.com/engine/reference/commandline/attach) will connect to a running container.

**​**

**CPU Constraints** You can limit CPU, either using a percentage of all CPUs, or by using specific cores.For example, you can tell the [`cpu-shares`](https://docs.docker.com/engine/reference/run/#/cpu-share-constraint) setting.&#x20;

The setting is a bit strange -- 1024 means 100% of the CPU, so if you want the container to take 50% of all CPU cores, you should specify 512:docker run -it -c 512 agileek/cpuset-test

You can also only use some CPU cores using [`cpuset-cpus`](https://docs.docker.com/engine/reference/run/#/cpuset-constraint)`:`docker run -it --cpuset-cpus=0,4,6 agileek/cpuset-test

> Note that Docker can still **see** all of the CPUs inside the container -- it just isn't using all of them.

**Memory Constraints:** You can also set [memory constraints](https://docs.docker.com/engine/reference/run/#/user-memory-constraints) on Docker:docker run -it -m 300M ubuntu:14.04 /bin/bash

### <mark style="color:yellow;">**Info**</mark>

* ​[`docker ps`](https://docs.docker.com/engine/reference/commandline/ps) shows running containers.
* ​[`docker logs`](https://docs.docker.com/engine/reference/commandline/logs) gets logs from container.
* ​[`docker inspect`](https://docs.docker.com/engine/reference/commandline/inspect) looks at all the info on a container (including IP address).
* ​[`docker events`](https://docs.docker.com/engine/reference/commandline/events) gets events from container.
* ​[`docker port`](https://docs.docker.com/engine/reference/commandline/port) shows public facing port of container.
* ​[`docker top`](https://docs.docker.com/engine/reference/commandline/top) shows running processes in container.
* ​[`docker stats`](https://docs.docker.com/engine/reference/commandline/stats) shows containers' resource usage statistics.
* ​[`docker diff`](https://docs.docker.com/engine/reference/commandline/diff) shows changed files in the container's FS.

### <mark style="color:yellow;">**Import / Export**</mark>

* ​[`docker cp`](https://docs.docker.com/engine/reference/commandline/cp) copies files or folders between a container and the local filesystem.
* ​[`docker export`](https://docs.docker.com/engine/reference/commandline/export) turns container filesystem into tarball archive stream to STDOUT.

### <mark style="color:yellow;">**Import/Export container**</mark>

Import a container as an image from file:cat my\_container.tar.gz | docker import - my\_image:my\_tagExport an existing container:docker export my\_container | gzip > my\_container.tar.gz

### <mark style="color:yellow;">**Executing Commands**</mark>

* ​[`docker exec`](https://docs.docker.com/engine/reference/commandline/exec) to execute a command in container.

## <mark style="color:red;">Images</mark> <a href="#images" id="images"></a>

### <mark style="color:yellow;">**Lifecycle**</mark>

* ​[`docker images`](https://docs.docker.com/engine/reference/commandline/images) shows all images.
* ​[`docker import`](https://docs.docker.com/engine/reference/commandline/import) creates an image from a tarball.
* ​[`docker build`](https://docs.docker.com/engine/reference/commandline/build) creates image from Dockerfile.
* ​[`docker commit`](https://docs.docker.com/engine/reference/commandline/commit) creates image from a container, pausing it temporarily if it is running.
* ​[`docker rmi`](https://docs.docker.com/engine/reference/commandline/rmi) removes an image.
* ​[`docker load`](https://docs.docker.com/engine/reference/commandline/load) loads an image from a tar archive as STDIN, including images and tags (as of 0.7).
* ​[`docker save`](https://docs.docker.com/engine/reference/commandline/save) saves an image to a tar archive stream to STDOUT with all parent layers, tags & versions (as of 0.7).

### <mark style="color:yellow;">**Info**</mark>

* ​[`docker history`](https://docs.docker.com/engine/reference/commandline/history) shows history of image.
* ​[`docker tag`](https://docs.docker.com/engine/reference/commandline/tag) tags an image to a name (local or registry).

### <mark style="color:yellow;">**Load/Save image**</mark>

#### <mark style="color:purple;">Load an image from file:</mark>&#x20;

```bash
docker load < my_image.tar.gz
```

#### <mark style="color:purple;">Save an existing image:</mark>&#x20;

```bash
docker save my_image:my_tag | gzip > my_image.tar.gz
```

## <mark style="color:red;">Dockerfile</mark> <a href="#dockerfile" id="dockerfile"></a>

### <mark style="color:yellow;">**Instructions**</mark>

* ​[.dockerignore](https://docs.docker.com/engine/reference/builder/#dockerignore-file)​
* ​[FROM](https://docs.docker.com/engine/reference/builder/#from) Sets the Base Image for subsequent instructions.
* ​[MAINTAINER (deprecated - use LABEL instead)](https://docs.docker.com/engine/reference/builder/#maintainer-deprecated) Set the Author field of the generated images.
* ​[RUN](https://docs.docker.com/engine/reference/builder/#run) execute any commands in a new layer on top of the current image and commit the results.
* ​[CMD](https://docs.docker.com/engine/reference/builder/#cmd) provide defaults for an executing container.
* ​[EXPOSE](https://docs.docker.com/engine/reference/builder/#expose) informs Docker that the container listens on the specified network ports at runtime. NOTE: does not actually make ports accessible.
* ​[ENV](https://docs.docker.com/engine/reference/builder/#env) sets environment variable.
* ​[ADD](https://docs.docker.com/engine/reference/builder/#add) copies new files, directories or remote file to container. Invalidates caches. Avoid `ADD` and use `COPY` instead.
* ​[COPY](https://docs.docker.com/engine/reference/builder/#copy) copies new files or directories to container. By default this copies as root regardless of the USER/WORKDIR settings. Use `--chown=<user>:<group>` to give ownership to another user/group. (Same for `ADD`.)
* ​[ENTRYPOINT](https://docs.docker.com/engine/reference/builder/#entrypoint) configures a container that will run as an executable.
* ​[VOLUME](https://docs.docker.com/engine/reference/builder/#volume) creates a mount point for externally mounted volumes or other containers.
* ​[USER](https://docs.docker.com/engine/reference/builder/#user) sets the user name for following RUN / CMD / ENTRYPOINT commands.
* ​[WORKDIR](https://docs.docker.com/engine/reference/builder/#workdir) sets the working directory.
* ​[ARG](https://docs.docker.com/engine/reference/builder/#arg) defines a build-time variable.
* ​[ONBUILD](https://docs.docker.com/engine/reference/builder/#onbuild) adds a trigger instruction when the image is used as the base for another build.
* ​[STOPSIGNAL](https://docs.docker.com/engine/reference/builder/#stopsignal) sets the system call signal that will be sent to the container to exit.
* ​[LABEL](https://docs.docker.com/config/labels-custom-metadata/) apply key/value metadata to your images, containers, or daemons.
* ​[SHELL](https://docs.docker.com/engine/reference/builder/#shell) override default shell is used by docker to run commands.
* ​[HEALTHCHECK](https://docs.docker.com/engine/reference/builder/#healthcheck) tells docker how to test a container to check that it is still working.

## <mark style="color:red;">Registry & Repository</mark> <a href="#registry-and-repository" id="registry-and-repository"></a>

* ​[`docker login`](https://docs.docker.com/engine/reference/commandline/login) to login to a registry.
* ​[`docker logout`](https://docs.docker.com/engine/reference/commandline/logout) to logout from a registry.
* ​[`docker search`](https://docs.docker.com/engine/reference/commandline/search) searches registry for image.
* ​[`docker pull`](https://docs.docker.com/engine/reference/commandline/pull) pulls an image from registry to local machine.
* ​[`docker push`](https://docs.docker.com/engine/reference/commandline/push) pushes an image to the registry from local machine.

## <mark style="color:red;">Volumes</mark> <a href="#volumes" id="volumes"></a>

### <mark style="color:yellow;">**Lifecycle**</mark>

* ​[`docker volume create`](https://docs.docker.com/engine/reference/commandline/volume_create/)​
* ​[`docker volume rm`](https://docs.docker.com/engine/reference/commandline/volume_rm/)​

### <mark style="color:yellow;">**Info**</mark>

* ​[`docker volume ls`](https://docs.docker.com/engine/reference/commandline/volume_ls/)​
* ​[`docker volume inspect`](https://docs.docker.com/engine/reference/commandline/volume_inspect/)​

## <mark style="color:red;">Networks</mark> <a href="#networks" id="networks"></a>

### <mark style="color:yellow;">**Lifecycle**</mark>

* ​[`docker network create`](https://docs.docker.com/engine/reference/commandline/network_create/) NAME Create a new network (default type: bridge).
* ​[`docker network rm`](https://docs.docker.com/engine/reference/commandline/network_rm/) NAME Remove one or more networks by name or identifier. No containers can be connected to the network when deleting it.

### <mark style="color:yellow;">**Info**</mark>

* ​[`docker network ls`](https://docs.docker.com/engine/reference/commandline/network_ls/) List networks
* ​[`docker network inspect`](https://docs.docker.com/engine/reference/commandline/network_inspect/) NAME Display detailed information on one or more networks.

### <mark style="color:yellow;">**Connection**</mark>

* ​[`docker network connect`](https://docs.docker.com/engine/reference/commandline/network_connect/) NETWORK CONTAINER Connect a container to a network
* ​[`docker network disconnect`](https://docs.docker.com/engine/reference/commandline/network_disconnect/) NETWORK CONTAINER Disconnect a container from a network.

​<https://github.com/wsargent/docker-cheat-sheet#dockerfile>