Day 20 - Docker CheatSheet

Docker is an open source software platform used to create, deploy and manage virtualized application containers on a common operating system (OS) with the aid of certain tools.

Installing Docker Engine

Essential Glossary related to Docker

Commands

Running a container

• Start a container from image

    docker run <image>
  

• Start a container with custom name

    docker run --name <your_name> <image>
  

• Start a container in detached mode

    docker run -d <image>
  

• Start a container with Port mappings

    docker run -P [host_port]:[container_port] <image>
  

• Start a container with a hostname

    docker run --hostname <your_name> <image>
  

• Start container in interactive mode

    docker run -it <image>
  

• Start container with a specific entrypoint

    docker run --entrypoint <executable> <image>
  

• Start a container by mapping a local directory into the container

    docker run -v <host_dir>:<target_dir_in_container> image
  

---

Operations on images

• Build an image from Dockerfile

    docker build <directory>/<url>
  

• Download an image from DockerHub

    docker pull <image>:[TAG] # can also specify version/TAG
    #default is the 'latest' version
  

• List all the images

    docker images
  

• Remove all containers

    docker rmi $(docker images -q)
  

• List dangling images

    docker images -f dangling=true
  

• Remove all dangling images

    docker rmi $(docker images -f dangling=true -q)
  

• Give tag to an image

    docker build tag <name>/<image_ID> <new_name>:[tag]
  

• Save an image to a tar file

    docker save <image> > <name.tar>
  

• Load an image from a tar file

    docker load -i <tar_file>
  

Operations related to a container

• Stop or remove all the containers at once

    docker rm -f $(docker ps -aq)
    docker stop -f $(docker ps)
  

• List all the running containers

    docker ps
    docker ps -a # list all active and stopped containers
  

• Stop a container

    docker stop <container1> <container2> ...
  

• Delete a container

    docker rm <container1> <container2> ...
    docker rm -f <container1> <container2> ... # force delete
  

• Restart a running container

    docker restart <container1> <container2> ...
  

• Start a stopped container

    docker start <container1> <container2> ...
  

• Execute a command within a running container

    docker exec <container> <command>
    # for e.g.
    docker exec -d mycontainer touch /tmp/execWorks
  

• Copy files from localhost to container and reverse

    docker cp <source_path> <container>:<dest_path> # localhost to container
    docker cp <container>:<source_path> <dest_path>
  

• Rename a container

    docker rename <old_name> <new_name>
  

• Create an image from a container

    docker container commit -a "author" -m "message" <container> <image_name>
  

• Delete all the stopped containers

    docker prune $(docker ps -a)
  

---

Monitoring

• Show overall stats of all containers

    docker stats <container>
  

• Show logs of a container

    docker logs <container>
  

• Show processes running in a container

    docker top <continer>
  

• Show mapped ports of a container

    docker port <container>
  

• Detailed info about any docker entity

    docker inspect <image>|<container>|<entity>
  

• List files/directories added, edited or deleted from a container compared to the base image

    docker diff <container>
  

Happy Learning ;)