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Artur Dryomov 2015-10-11 20:21:46 +03:00
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# Docker Cheat Sheet # Docker Cheat Sheet
NOTE: This used to be a gist that continually expanded. It's now a github project because it's considerably easier for other people to edit, fix and expand on Docker using Github. Just click [README.md](https://github.com/wsargent/docker-cheat-sheet/blob/master/README.md), and then on the "writing pen" icon on the right to edit. NOTE: This used to be a gist that continually expanded. It's now a GitHub project because it's considerably easier for other people to edit, fix and expand on Docker using Github. Just click [README.md](https://github.com/wsargent/docker-cheat-sheet/blob/master/README.md), and then on the "writing pen" icon on the right to edit.
* [Why](#why) * [Why](#why)
* [Prerequisites](#prerequisites) * [Prerequisites](#prerequisites)
@ -31,7 +31,7 @@ I use [Oh My Zsh](https://github.com/robbyrussell/oh-my-zsh) with the [Docker pl
### Linux ### Linux
The 3.10.x kernel is [the minimum requirement](http://docs.docker.com/installation/binaries/#check-kernel-dependencies) for Docker. The 3.10.x kernel is [the minimum requirement](https://docs.docker.com/installation/binaries/#check-kernel-dependencies) for Docker.
### MacOS ### MacOS
@ -49,11 +49,11 @@ curl -sSL https://get.docker.com/ | sh
If you're not willing to run a random shell script, please see the [installation](https://docs.docker.com/installation/) instructions for your distribution. If you're not willing to run a random shell script, please see the [installation](https://docs.docker.com/installation/) instructions for your distribution.
If you are a complete Docker newbie, you should follow the [series of tutorials](http://docs.docker.com/linux/started/) now. If you are a complete Docker newbie, you should follow the [series of tutorials](https://docs.docker.com/linux/started/) now.
### Mac OS X ### Mac OS X
Download and install [Docker Toolbox](https://www.docker.com/toolbox). If that doesn't work, see the [installation instructions](http://docs.docker.com/installation/mac/). Download and install [Docker Toolbox](https://www.docker.com/toolbox). If that doesn't work, see the [installation instructions](https://docs.docker.com/installation/mac/).
Docker used to use boot2docker, but you should be using docker machine now. The Docker website has instructions on [how to upgrade](https://docs.docker.com/installation/mac/#migrate-from-boot2docker). If you have an existing docker instance, you can also install the [Docker Machine](https://docs.docker.com/machine/install-machine/) binaries directly. Docker used to use boot2docker, but you should be using docker machine now. The Docker website has instructions on [how to upgrade](https://docs.docker.com/installation/mac/#migrate-from-boot2docker). If you have an existing docker instance, you can also install the [Docker Machine](https://docs.docker.com/machine/install-machine/) binaries directly.
@ -73,7 +73,7 @@ docker run hello-world
That's it, you have a running Docker container. That's it, you have a running Docker container.
If you are a complete Docker newbie, you should probably follow the [series of tutorials](http://docs.docker.com/mac/started/) now. If you are a complete Docker newbie, you should probably follow the [series of tutorials](https://docs.docker.com/mac/started/) now.
## Containers ## Containers
@ -124,7 +124,7 @@ Restart policies on crashed docker instances are [covered here](http://container
### Import / Export ### Import / Export
* [`docker cp`](http://docs.docker.com/reference/commandline/cp) copies files or folders between a container and the local filesystem.. * [`docker cp`](https://docs.docker.com/reference/commandline/cp) copies files or folders between a container and the local filesystem..
* [`docker export`](https://docs.docker.com/reference/commandline/export) turns container filesystem into tarball archive stream to STDOUT. * [`docker export`](https://docs.docker.com/reference/commandline/export) turns container filesystem into tarball archive stream to STDOUT.
### Executing Commands ### Executing Commands
@ -167,7 +167,7 @@ Docker.com hosts its own [index](https://registry.hub.docker.com/) to a central
### Run local registry ### Run local registry
[Registry implementation](http://github.com/docker/docker-registry) has an official image for basic setup that can be launched with [Registry implementation](https://github.com/docker/docker-registry) has an official image for basic setup that can be launched with
[`docker run -p 5000:5000 registry`](https://github.com/docker/docker-registry#quick-start) [`docker run -p 5000:5000 registry`](https://github.com/docker/docker-registry#quick-start)
Note that this installation does not have any authorization controls. You may use option `-P -p 127.0.0.1:5000:5000` to limit connections to localhost only. Note that this installation does not have any authorization controls. You may use option `-P -p 127.0.0.1:5000:5000` to limit connections to localhost only.
In order to push to this repository tag image with `repositoryHostName:5000/imageName` then push this tag. In order to push to this repository tag image with `repositoryHostName:5000/imageName` then push this tag.
@ -201,11 +201,11 @@ In order to push to this repository tag image with `repositoryHostName:5000/imag
The versioned filesystem in Docker is based on layers. They're like [git commits or changesets for filesystems](https://docs.docker.com/terms/layer/). The versioned filesystem in Docker is based on layers. They're like [git commits or changesets for filesystems](https://docs.docker.com/terms/layer/).
Note that if you're using [aufs](http://en.wikipedia.org/wiki/Aufs) as your filesystem, Docker does not always remove data volumes containers layers when you delete a container! See [PR 8484](https://github.com/docker/docker/pull/8484) for more details. Note that if you're using [aufs](https://en.wikipedia.org/wiki/Aufs) as your filesystem, Docker does not always remove data volumes containers layers when you delete a container! See [PR 8484](https://github.com/docker/docker/pull/8484) for more details.
## Links ## Links
Links are how Docker containers talk to each other [through TCP/IP ports](https://docs.docker.com/userguide/dockerlinks/). [Linking into Redis](https://docs.docker.com/examples/running_redis_service/) and [Atlassian](http://blogs.atlassian.com/2013/11/docker-all-the-things-at-atlassian-automation-and-wiring/) show worked examples. You can also (in 0.11) resolve [links by hostname](https://docs.docker.com/userguide/dockerlinks/#updating-the-etchosts-file). Links are how Docker containers talk to each other [through TCP/IP ports](https://docs.docker.com/userguide/dockerlinks/). [Linking into Redis](https://docs.docker.com/examples/running_redis_service/) and [Atlassian](https://blogs.atlassian.com/2013/11/docker-all-the-things-at-atlassian-automation-and-wiring/) show worked examples. You can also (in 0.11) resolve [links by hostname](https://docs.docker.com/userguide/dockerlinks/#updating-the-etchosts-file).
NOTE: If you want containers to ONLY communicate with each other through links, start the docker daemon with `-icc=false` to disable inter process communication. NOTE: If you want containers to ONLY communicate with each other through links, start the docker daemon with `-icc=false` to disable inter process communication.
@ -232,11 +232,11 @@ And you can connect to it that way.
To delete links, use `docker rm --link `. To delete links, use `docker rm --link `.
If you want to link across docker hosts then you should look at [Swarm](http://docs.docker.com/swarm/). This [link on stackoverflow](http://stackoverflow.com/questions/21283517/how-to-link-docker-services-across-hosts) provides some good information on different patterns for linking containers across docker hosts. If you want to link across docker hosts then you should look at [Swarm](https://docs.docker.com/swarm/). This [link on stackoverflow](https://stackoverflow.com/questions/21283517/how-to-link-docker-services-across-hosts) provides some good information on different patterns for linking containers across docker hosts.
## Volumes ## Volumes
Docker volumes are [free-floating filesystems](http://docs.docker.com/userguide/dockervolumes/). They don't have to be connected to a particular container. You should use volumes mounted from [data-only containers](https://medium.com/@ramangupta/why-docker-data-containers-are-good-589b3c6c749e) for portability. Docker volumes are [free-floating filesystems](https://docs.docker.com/userguide/dockervolumes/). They don't have to be connected to a particular container. You should use volumes mounted from [data-only containers](https://medium.com/@ramangupta/why-docker-data-containers-are-good-589b3c6c749e) for portability.
Volumes are useful in situations where you can't use links (which are TCP/IP only). For instance, if you need to have two docker instances communicate by leaving stuff on the filesystem. Volumes are useful in situations where you can't use links (which are TCP/IP only). For instance, if you need to have two docker instances communicate by leaving stuff on the filesystem.
@ -248,7 +248,7 @@ See [advanced volumes](http://crosbymichael.com/advanced-docker-volumes.html) fo
For an easy way to clean abandoned volumes, see [docker-cleanup-volumes](https://github.com/chadoe/docker-cleanup-volumes) For an easy way to clean abandoned volumes, see [docker-cleanup-volumes](https://github.com/chadoe/docker-cleanup-volumes)
As of 1.3, you can [map MacOS host directories as docker volumes](http://docs.docker.com/userguide/dockervolumes/#mount-a-host-directory-as-a-data-volume) through boot2docker: As of 1.3, you can [map MacOS host directories as docker volumes](https://docs.docker.com/userguide/dockervolumes/#mount-a-host-directory-as-a-data-volume) through boot2docker:
``` ```
docker run -v /Users/wsargent/myapp/src:/src docker run -v /Users/wsargent/myapp/src:/src