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End to End Dockerization

Consider we have a Simple Spring Boot application which exposes REST endpoints to fetch Employee records from MySQL Database

In Below, we explained step by step on how we can Dockerize the entire application

Stage 1 : Both SpringBoot App & DB Running in local (host system)​

DB Connection String

jdbc:mysql://localhost:3306/MY_DB

Dockerfile

Not applicable (N/A)

Docker-compose.yaml

N/A

Stage 2 : SpringBoot App containerized using Dockerfile & DB Running in local (host system)​

DB Connection String

jdbc:mysql://host.docker.internal:3306/MY_DB

Dockerfile

FROM openjdk:8-jdk-alpine
COPY EmpApp.jar EmpApp.jar
CMD ["java", "-jar", "EmpApp.jar"]

Docker-compose.yaml

N/A

Stage 3 : SpringBoot App containerized using docker-compose.yaml & DB Running in local (host system)​

DB Connection String

jdbc:mysql://host.docker.internal:3306/MY_DB

Dockerfile

FROM openjdk:8-jdk-alpine
COPY EmpApp.jar EmpApp.jar
CMD ["java", "-jar", "EmpApp.jar"]

Docker-compose.yaml

version : '3'
services:
  web:
    image : emp-compose-img
    build : .
    ports :
      - "8080:8080"

Stage 4 : Both SpringBoot App & MySQL DB containerized using docker-compose.yaml​

DB Connection String

jdbc:mysql://db:3306/MY_DB

Dockerfile

FROM openjdk:8-jdk-alpine
COPY EmpApp.jar EmpApp.jar
CMD ["java", "-jar", "EmpApp.jar"]

Docker-compose.yaml

version : '3'
services:
  web:
    image : emp-compose-img
    build : .
    ports :
      - "8080:8080"
  db:
    image : mysql:5.7
    restart : always
    environment:
      MYSQL_DATABASE: 'MY_DB'
      MYSQL_ROOT_PASSWORD: 'rootroot'
    expose :
      - "3306"
    volumes:
      - ./scripts:/docker-entrypoint-initdb.d
      - ./data:/var/lib/mysql