DevOps Classroomnotes 27/Jun/2022

Docker Contd…

• Open Container Initiative:
  • Refer Here
  • An OCI image is created by OCI Runtime filesystem and can be run by OCI Runtime
• The other container technologies:
  • Podman Refer Here
  • rkt Refer Here
  • lxc Refer Here
• Note: JSON and YAML Tutorial Refer Here

Scenario 1

• Docker image with non root user

FROM python:3.9-alpine
LABEL author "khaja"
RUN adduser -D qtuser && mkdir /home/qtuser/sample
USER qtuser
WORKDIR /home/qtuser/sample
ADD . /home/qtuser/sample/
RUN pip install -r requirements.txt
EXPOSE 5000
CMD ["python", "main.py"]

• Refer Here for the sample app code

Scenario 2

• Try Creating a user called appuser in the Openjdk:11 and try to run springpetclic as appuser

FROM openjdk:11
LABEL author 'khaja'
EXPOSE 8080
RUN useradd -m appuser
USER appuser
WORKDIR /home/appuser
ADD --chown=appuser https://referenceapplicationskhaja.s3.us-west-2.amazonaws.com/spring-petclinic-2.4.2.jar /home/appuser/spring-petclinic-2.4.2.jar
CMD ["java", "-jar", "/home/appuser/spring-petclinic-2.4.2.jar"]

Scenario 3

• create a mysql container on a new network with some password
• create a phpmyadmin container which connects to mysql container created in earlier step

docker network create -d bridge mynet
docker volume create mydbstore
docker container run --name mydb -d -P --mount type=volume,src=mydbstore,target=/var/lib/mysql --network -e MYSQL_ROOT_PASSWORD=rootroot mynet mysql:8 
docker container run --name mysqlui -d -P -e PMA_HOST=mydb --network mynet -e MYSQL_ROOT_PASSWORD=rootroot phpmyadmin

• The same in docker-compose Refer Here

version: "3.9"
services:
  mysqlui:
    image: phpmyadmin
    ports:
      - 8080:80
    networks:
      - mynet
    environment:
      - PMA_HOST=mydb
      - PMA_USER=root
      - PMA_PASSWORD=rootroot
    depends_on: 
      - mydb
  mydb:
    image: mysql:8
    volumes:
      - mydbstore:/var/lib/mysql
    networks:
      - mynet
    ports:
      - 3306:3306
    environment:
      - MYSQL_ROOT_PASSWORD=rootroot
      - MYSQL_USER=app
      - MYSQL_PASSWORD=appapp

volumes:
  mydbstore:
    driver: local

networks:
  mynet: {}