Docker 101

Docker theory

• What is Docker ?
• [https://www.docker.com/resources/what-container] (https://www.docker.com/resources/what-container)
• Notions:
  • container
  • image
  • registry
  • Dockerfile

Docker practice

Install docker on your machine

Use my repository: [https://github.com/g-dury/docker101] (https://github.com/g-dury/docker101)

Latest Docker version: 18.09.2

1. Build a docker image helloworld

   • FROM (choose from docker hub)
   • ADD
   • RUN
   • and then CMD/ENTRYPOINT
   • go into the helloworld folder
   • docker build -t helloworld:1 .

2. Launch a hello world service with docker

   • Know your docker commands:
     • docker ps -a
     • docker pull
     • docker run -d --name=hello helloworld:1
     • docker logs -f <CONTAINER>
     • docker stop
     • docker rm -f <CONTAINER>

3. How to expose a container to the host

   • Use the -p argument
   • Understand the network notions of docker:
     • bridge
     • host
     • others

4. Make two containers communicate with each other

   • launch a mongodb docker container [https://hub.docker.com/_/mongo] (https://hub.docker.com/_/mongo)
   • use another docker container to write to it and detail the network configuration you used

5. Make data of docker container persistent: volumes