Docker Client Operations

External

• Docker Cheat Sheet: https://github.com/wsargent/docker-cheat-sheet

Internal

• Docker Concepts
• Docker Operations

Commands

build	create	cp	rm
pull	push	rmi
tag

Installation Verification

Docker Installation Verification

Running the Client

On the Same Host as the Server

In order to connect to the docker server over the Unix socket, the user running the client must have permissions to do so:

[testuser@docker-server ~]$ ls -al /var/run/docker.sock
srw-rw----. 1 root docker 0 Apr 25 16:00 /var/run/docker.sock

One way to do that is to make the user a member of "docker" group:

usermod -G docker testuser

Info

• Server and client version docker version
• System-wide info docker info
• Low level metadata about an image or container docker inspect
• Resource statistics for running containers docker stats.

Image Operations

Registry Operations

• Search Docker Hub or other registries: docker search
• List images in the local registry: docker images
• Remove images from the local registry: docker rmi
• Pull an image or a repository from a registry and place it in the local registry: docker pull
• Push an image or a repository to a registry: docker push
• TODO: how is a docker instance configured with specific registries?
• docker tag

Image Introspection and Manipulation

• Build an image: docker build
  • Building a Container that Loops
• Obtain low-level metadata about an image: docker inspect
• Obtain image history: docker history
• Save an image into a TAR archive: docker save
• Load an image from a TAR archive: docker load
• Export a container's filesystem into a TAR file: docker export
• Create a new image from a TAR archive: docker import
• Modifying an existing Image
• Copy Files In and Out of a Container

Explore an Image

If the image has a shell, it can be run in interactive mode and explored:

 docker run --rm -it <image-id|name> sh

While the container is running, the image can be exported into a TAR file system with docker export and explored off-line.

Container Lifecycle Operations

• List containers (running or otherwise): docker ps
• Create and run a new container: docker run
• Stop a running container: docker stop
• Start a previously stopped container: docker start
• Restart a container: docker restart
• Remove a container: docker rm
• Start a Container Automatically

Container Introspection

• Low-level information about a container: docker inspect
• Look at container's logs docker logs
• Explore changes introduced in the container's file system docker diff
• Resource statistics for running containers docker stats.

Interaction with a Running Container

• Attach to a Running Container
• docker exec
• docker update
• docker attach
• Copy files docker cp.

Security

• docker login

Scenarios

Docker Client Scenarios

Troubleshooting

• Get the Reasons a Container Was Killed For