Docker compose deploys SpringBoot project to connect to MySQL and the pitfalls encountered

//Download docker-compose
curl -L "https://get.daocloud.io/docker/compose/releases/download/1.27.3/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

//Add executable permissions to the file, otherwise the root user does not have permission chmod +x /usr/local/bin/docker-compose

//Check whether the installation is successful [root@SJS local]# docker-compose --version
docker-compose version 1.27.3, build 4092ae5d

#Build, create, and start related containers docker-compose up -d

#Stop all related containers docker-compose stop

#List all container information docker-compose ps

FROM java:8
# Create a container volume in the docker container for data storage and persistence VOLUME /tmp
#Used to copy files and decompress (COPY cannot decompress)
#Copy the current redpacket-backend-1.0.0-SNAPSHOT.jar to the root directory of the docker container ADD redpacket-backend-1.0.0-SNAPSHOT.jar app.jar
#Create an app.jar file during the run process RUN sh -c 'touch /app.jar'
ENV JAVA_OPTS=""
#Execute the Linux command with the passed parameters to start the jar package #The difference between CMD is that only the last one of multiple CMD commands will take effect, and CMD will be replaced by the parameters after docker run #The command executed by ENTRYPOINT will be appended and will not overwrite ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

version: '3.8'
services:
  #mysql service name mysql:
    #Image used: mysql:5.7
    command: --default-authentication-plugin=mysql_native_password
    ports:
      -3306:3306
    environment:
      MYSQL_ROOT_HOST: '%'
      MYSQL_ROOT_PASSWORD: '123456'
      MYSQL_ALLOW_EMPTY_PASSWORD: 'no'
      MYSQL_DATABASE: 'redpacket'
      MYSQL_USER: 'root'
      MYSQL_PASSWORD: '123456'
    #File volumes that need to be mounted:
      - /mydata/mysql/data:/var/lib/mysql
      - /mydata/mysql/log:/var/log/mysql
      - /mydata/mysql/conf:/etc/mysql
    restart: always
    networks:
      -test_network
  #SpringBoot project service redpacket:
    container_name: redpacket
    #Build the Dockerfile in the specified directory
    build:
      context: .
      dockerfile: Dockerfile
    depends_on:
      -mysql
    ports:
      - "8090:8090"
    restart: always
    networks:
      -test_network
networks:
  test_network: