Docker Client Operations

External

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

Internal

• Docker Concepts
• Docker Operations

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

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
• TODO: how is a docker instance configured with specific registries?

Image Manipulation

• Build an image: docker build
• 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: load
• Export a container's filesystem into a TAR file: docker export
• Create a new image from a TAR archive: docker import

Explore an Image

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

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

Otherwise it can be exported into a TAR file system with docker export and explored.

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
• 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

Interaction with a Running Container

• Attach to a Running Container
• docker exec
• docker update

Scenarios

Docker Client Scenarios