Docker commands

• clear the stopped containers, volumes, images

  docker container prune
  docker volume prune
  docker image prune
  

• docker-compose making 2 differnet container talk to one another

  • https://github.ibm.com/Krishna-Damarla1/Edeka/blob/master/ldap/docker-compose-persistent1.yml

• Pull or Import the docker image

  • docker pull cloudera/quickstart:latest (sample Cloudera docker image installation) (or)
  • docker import - cloudera/quickstart:latest < cloudera-quickstart-vm-5.13.0-0-beta-docker.tar.gz (Import is better than pull. Download the package with download manager to surpass any pauses in bandwidths)

• Run the docker image

  • docker run --hostname=quickstart.cloudera --privileged=true -t -it -p 8888:8888 -p 80:80 cloudera/quickstart /usr/bin/docker-quickstart

• Show containers

  • list only running containers - docker ps
  • Containers with assigned ports info - docker container ls -a
  • show only stopped Docker containers, - docker ps --filter "status=exited" (or) docker ps -f "status=exited"
  • show all containers (those even exited) - docker ps -a

• Enter the existing docker container shell

  • docker exec -it container-id bash (or) docker exec -it container_id

• Start / stop containers

  • docker stop container_name
  • docker start container_name
  • docker restart container_name (give this command on running docker container)

• Kill the container

  • docker kill container_id
  • kill all running containers - docker ps -aq
  • Remove specific container - docker rm -f CONTAINER_ID
  • Remove all stopped containers - docker rm $(docker ps -a -q) (or) docker rm -f `docker ps -aq`

• Display / Delete images

  • docker images
  • Delete specific images - docker image rm image_id1 image_id2
  • Delete all images - docker rmi $(docker images -q)
  • Incase image is used by stopped containers, force remove - docker rmi -f <image_id>

• Image build history

  • docker image history --no-trunc image_name

Restore / Commit

• Restore last save point
  • docker start container_id
  • docker attach container_id
• Commit after each run to preserve data
  • Display all containers - docker container ls -a
  • sudo docker commit <container_id> iman/ping
  • sudo docker run iman/ping ping www.google.com

Build and push image

• docker build -t <docker-hub-address/your-private-repo>/image-name:latest .
• docker push <docker-hub-address/your-private-repo>/image-name:latest

Delete images / containers

• Delete the images - docker rmi image_id Ex: docker rmi a3f949e5ebfd
• Delete the containers - docker stop container_id ; docker rm container_id Ex: docker rm a3f949e5ebfd
• Remove all those images at once that have exited container - docker image prune -a

Ref: https://docs.docker.com/engine/reference/commandline/image_prune/ https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes

Delete volumes / networks

docker system prune --volumes docker network rm network_id

Ref: https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks/

Docker settings - UI - Preferences (Advanced)

• For some applications like cloudera quickstart, Docker need 2 virtual cpus and minimum 8 gb ram. Only then we can start all servers and cloudera manager sucessfully.
• Check system requirements like # of cpu, ram of your application before running docker image.

Ref

• https://docs.docker.com/engine/reference/commandline/rm/
• https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks/
• Cloudera docker installation https://www.youtube.com/watch?v=jILo-WnZUEY

Others

• Running Cloudera Quickstart has constraints of centos having outdated python in /usr/bin location. creating a seperate venv is recommended / easier than updating python to newer versions in centos. (Some system files need the pre installed python version)
• Working with docker is easier than oracle virtual box. Copy paste between local m/c and docker dosenot need any specific folder sharing like in virtual box. Also, docker images can be build and pushed to any server easily than vm.

Virtual Box

• Use option + commnand to come out of virtual box environment.