kevinxh/docker-cheat-sheet.md

## docker-cheat-sheet.md

      
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              docker-cheat-sheet.md
            
          
    1. 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.

Info


docker ps shows running containers.
docker logs gets logs from container.  (You can use a custom log driver, but logs is only available for json-file and journald in 1.10).
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.

Executing Commands


docker exec to execute a command in container.

2. 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).

3. 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.  Note that this only copies as root, so you have to chown manually regardless of your USER / WORKDIR setting.  See moby/moby#30110
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.

4. Volumes

Docker volumes are free-floating filesystems. They don't have to be connected to a particular container. You should use volumes mounted from data-only containers for portability.
Lifecycle


docker volume create
docker volume rm

Info


docker volume ls
docker volume inspect

5. Networks

Lifecycle


docker network create
docker network rm

Info


docker network ls
docker network inspect

Connection


docker network connect
docker network disconnect

6. 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.