Completek8s Classroomnotes 12/Jul/2023

YAML

• YAML is key value or name value pair collection

<name>: <value>

• Lets try to understand with an example of sports club
  • name: ltsportsclub
  • branches:
    • Ameerpet
      • indoor
        • carrom
        • bowling
        • chess
        • ludo
      • outdoor
        • badminton
        • volley ball
        • swimming
    • KPHB
      • indoor:
        • carrom
        • bowling
        • chess
        • ludo
      • outdoor
        • badminton
        • volley ball
        • swimming
        • cricket
    • Gachibowli
      • indoor:
        • bowling
        • playstation
        • snooker
      • outdoor
        • badminton
        • volley ball
        • swimming
        • cricket
        • golf
• Sample yaml

---
name: ltsportsclub
headoffice: 
  address:
    flatno: 407
    building: mytrivanam
    street: ameerpet main road
    area: Ameerpet
    city: Hyderabad
    pincode: 500082      
  mobile: 9999999999
  email: headoffice@ltsportsclub.com
branches:
  - ameerpet:
      sports:
        indoor:
          - carrom
          - chess
          - bowling
          - ludo
        outdoor:
          - badminton
          - volley ball
          - swimming
      address:
        flatno: 408
        building: ameerpet main
        street: ameerpet main
        city: Hyderabad        
      mobile: 88888888888
      email: ameerpet@ltsportsclub.com
  - kphb:
      sports:
        indoor:
          - carrom
          - chess
          - bowling
          - ludo
        outdoor:
          - badminton
          - volley ball
          - swimming
          - cricket
      address:
        flatno: 408
        building: kphb main
        street: kphb main
        city: Hyderabad        
      mobile: 88888888888
      email: kphb@ltsportsclub.com
  - gachibowli:
      sports:
        indoor:
          - carrom          
          - bowling
          - snooker
        outdoor:
          - badminton
          - volley ball
          - swimming
          - cricket
          - golf
          - tennis
      address:
        flatno: 408
        building: gachibowli main
        street: gachibowli main
        city: Hyderabad        
      mobile: 88888888888
      email: gachibowli@ltsportsclub.com

• Note: YAML Tutorial Refer Here
• YAML Types:
  • Simple:
    • Text
    • Number
    • boolean: true/false yes/no
  • complex
    • list/array (-)
    • dictionary/map/object
• Schema: yaml schema represents structure of yaml which we would be authoring

Docker Compose

• Refer Here for docker compose reference
• Basic structure

---
version: string
services: 
networks:
volumes:
configs:
secrets:

• references
  • version: Refer Here
  • services: Refer Here
  • networks: Refer Here
  • volumes: Refer Here

Activity: execute these by using docker cli

• create a nginx container expose 80 port to any port
• create an apache container expose 80 to any port
• create an jenkins/jenkins container: expose 8080 to any free port

docker container run -d -P nginx
docker container run -d -P httpd
docker container run -d -P jenkins/jenkins

• docker-compose

---
version: "3.8"
services:
  nginx:
    image: nginx
    ports:
      - "80"
  apache:
    image: httpd
    ports:
      - "80"
  jenkins:
    image: jenkins/jenkins
    ports:
      - "8080"

• Now create and start containers
  
  
• lets view the containers and network
  
  
• To remove whatever was created
  

Activity 2:

• Create a volume
• Create a network
• Create a mysql container and attach volume to /var/lib/mysql and run on the network created
• Create a wordpress container and run on network created. WordPress should expose port 80
• Docker-compose yaml

---
version: "3.8"
services:
  wordpress:
    image: wordpress
    networks:
      - wordpress-net
    ports:
      - 80
  mysql:
    image: mysql:8
    networks:
      - wordpress-net
    volumes:
      - wordpressdb:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: wordpress@123
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress@123
      MYSQL_DATABASE: wordpress
networks:
  wordpress-net:
volumes:
  wordpressdb:

• bring up the containers
  
• Examine containers, network and volume
  
• Exercise:
  • Run the docker compose files in nop commerce Refer Here
    • with microsoft sql server
    • with mysql
    • with postgress
  • Refer Here and try to understand any docker-compose file run and explain what happens
• Next Topics:
  • Containers on Windows