Docker cheat sheet

Check Version
 docker version shows which version of docker you have running.
Containers
Lifecycle
​docker create creates a container but does not start it.
​docker rename allows the container to be renamed.
​docker run creates and starts a container in one operation.
​docker rm deletes a container.
​docker update updates a container's resource limits.
Starting and Stopping
​docker start starts a container so it is running.
​docker stop stops a running container.
​docker restart stops and starts a container.
​docker pause pauses a running container, "freezing" it in place.
​docker unpause will unpause a running container.
​docker wait blocks until running container stops.
​docker kill sends a SIGKILL to a running container.
​docker attach will connect to a running container.
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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 setting. 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:
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 on Docker:
docker run -it -m 300M ubuntu:14.04 /bin/bash
Info
​docker ps shows running containers.
​docker logs gets logs from container.
​docker inspect looks at all the info on a container (including IP address).
​docker events gets events from container.
​docker port shows public facing port of container.
​docker top shows running processes in container.
​docker stats shows containers' resource usage statistics.
​docker diff shows changed files in the container's FS.
Import / Export
​docker cp copies files or folders between a container and the local filesystem.
​docker export turns container filesystem into tarball archive stream to STDOUT.
Import/Export container
Import a container as an image from file:
cat my_container.tar.gz | docker import - my_image:my_tag
Export an existing container:
docker export my_container | gzip > my_container.tar.gz
Executing Commands
​docker exec to execute a command in container.
Images
Lifecycle
​docker images shows all images.
​docker import creates an image from a tarball.
​docker build creates image from Dockerfile.
​docker commit creates image from a container, pausing it temporarily if it is running.
​docker rmi removes an image.
​docker load loads an image from a tar archive as STDIN, including images and tags (as of 0.7).
​docker save saves an image to a tar archive stream to STDOUT with all parent layers, tags & versions (as of 0.7).
Info
​docker history shows history of image.
​docker tag tags an image to a name (local or registry).
Load/Save image
Load an image from file:
docker load < my_image.tar.gz
Save an existing image:
docker save my_image:my_tag | gzip > my_image.tar.gz
Dockerfile
Instructions
​.dockerignore​
​FROM Sets the Base Image for subsequent instructions.
​MAINTAINER (deprecated - use LABEL instead) Set the Author field of the generated images.
​RUN execute any commands in a new layer on top of the current image and commit the results.
​CMD provide defaults for an executing container.
​EXPOSE informs Docker that the container listens on the specified network ports at runtime. NOTE: does not actually make ports accessible.
​ENV sets environment variable.
​ADD copies new files, directories or remote file to container. Invalidates caches. Avoid ADD and use COPY instead.
​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 configures a container that will run as an executable.
​VOLUME creates a mount point for externally mounted volumes or other containers.
​USER sets the user name for following RUN / CMD / ENTRYPOINT commands.
​WORKDIR sets the working directory.
​ARG defines a build-time variable.
​ONBUILD adds a trigger instruction when the image is used as the base for another build.
​STOPSIGNAL sets the system call signal that will be sent to the container to exit.
​LABEL apply key/value metadata to your images, containers, or daemons.
​SHELL override default shell is used by docker to run commands.
​HEALTHCHECK tells docker how to test a container to check that it is still working.
Registry & Repository
​docker login to login to a registry.
​docker logout to logout from a registry.
​docker search searches registry for image.
​docker pull pulls an image from registry to local machine.
​docker push pushes an image to the registry from local machine.
Volumes
Lifecycle
​docker volume create​
​docker volume rm​
Info
​docker volume ls​
​docker volume inspect​
Networks
Lifecycle
​docker network create NAME Create a new network (default type: bridge).
​docker network rm NAME Remove one or more networks by name or identifier. No containers can be connected to the network when deleting it.
Info
​docker network ls List networks
​docker network inspect NAME Display detailed information on one or more networks.
Connection
​docker network connect NETWORK CONTAINER Connect a container to a network
​docker network disconnect NETWORK CONTAINER Disconnect a container from a network
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​https://github.com/wsargent/docker-cheat-sheet#dockerfile​
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Docker Compose
Docker Compose cheat sheet
Last modified 3yr ago
Docker cheat sheet

Check Version

Containers

Lifecycle

Starting and Stopping

​

Info

Import / Export

Import/Export container

Executing Commands

Images

Lifecycle

Info

Load/Save image

Dockerfile

Instructions

Registry & Repository

Volumes

Lifecycle

Info

Networks

Lifecycle

Info

Connection
