Week 4: Docker

Weekly tasks

1. Introduction to Docker
   • Concepts to Learn:
     • Docker Docs
     • Docker compose Docs
     • Docker Crash Course for Absolute Beginners
     • Ultimate Docker Compose Tutorial
     • Networking

HomeWORK

Docker

1. Install docker and docker-compose-plugin on server week4. Add your user to docker group.
2. Create docker network
   1. Set week4 as a name.
   2. Set bridge as driver.
   3. Set 172.20.0.0/16 as subnet.
   4. Set 172.20.0.1 as gateway.
3. Write Dockerfile on server to build image nginx. It is important to build nginx image not to use already existed.
   1. Use Ubuntu as base image
   2. As nginx default page image has to return "DevOps Internship" message as nginx's default web page.
   3. Run newly created image on server as week4-nginx named container with 8080:80 binded port.
   4. Deploy newly created image to remote image registry as REGISTRY/name-surname:week4-nginx.
4. Pull gitlab repository to server week4 and write dockerfile for tictactoe project.
   1. Build and push image to REGISTRY/name-surname:week4-tictactoe.
   2. Run newly created image as week4-tictactoe named container
   3. week4-tictactoe container to week4 network. EXTRA: Image should be optimized as possible (as less image size as possible).
5. Work with docker compose folder. You have to write dockerfile for application folder it is python application runs on port 5000. Dockerfile for database is already provided no need to edit anything there. Declare week4 network as external in docker-compose.yml. database service name: postgres application service name: application
   1. Write docker compose file and run it as week4.
      1. Application started
      2. Database started
   2. Service: application
      1. Should be networks: default, week4
   3. Service: database
      1. Should be in networks: week4
   4. Bind application to port 5000.

Important!

Be carefull with environmental variables. 
Default values you can find in application/main.py