DevOps Classrom Series – 25/Jun/2020

Docker Internals

• Refer Here for Docekr internals

Docker Container (Contd..)

• Execute the following command

docker container run --help
docker container --help

• To remove all the containers

docker container rm -f $(docker container ls -a -q)

Portforwading

• To access the app on the container we use port forwarding
• To acheive this in command line
  • Assign dynamic port on host.

  docker container run -P <image>
  docker container run -P -d jenkins
  docker container ls
  

  • Assign a specific port on host

  docker container run -p <hostport>:<containerport> <image>
  docker container run -p 80:8080 -d jenkins
  docker container ls
  

Docker container modes

• Attached :
  • Container runs in the foreground
  • Default mode of docker
  • Example: docker container run -P jenkins
• Detached
  • Docker container runs in the background
  • add -d to container run to set this mode
  • Example: docker container run -P -d jenkins
• Interactive
  • In this mode we can interact with docker using terminal (/bin/bash, /bin/sh)
  • add -it to container run to set this mode
  • Example docker container run -it -P jenkins /bin/bash

Experiment with docker command line

• Execute docker container --help