如何使用 docker compose 初始化包含容器中某些表的数据库？

Question

I have my db service:

...
mysql-server:
    container_name: silos-database
    init: true
    restart: always
    build:
      context: .
      dockerfile: Dockerfile-db
    environment:
      - MYSQL_ROOT_PASSWORD=${ROOT_PASSWORD}
      - MYSQL_DATABASE=${DATABASE}
      - MYSQL_USER=${USER}
      - MYSQL_PASSWORD=${USER_PASSWORD}
    ports:
      - target: 3036
        published: 3036
    networks:
      - backend-net
    volumes:
      - type: volume
        source: db_vol
        target: /var/lib/mysql
...

This is my Dockerfile

FROM mysql:latest

The init.sql file contain same tables that my database must have

...
-- users data
CREATE TABLE IF NOT EXISTS users (
  email VARCHAR(128) PRIMARY KEY,
  username VARCHAR(64) UNIQUE,
  -- password is SHA256 hashed, so 64 characters
  password CHAR(64) NOT NULL
);

CREATE TABLE IF NOT EXISTS sessions (
  email VARCHAR(128) PRIMARY KEY,
  token TEXT NOT NULL,
  expireDate BIGINT(13) NOT NULL,
  FOREIGN KEY (email) REFERENCES users(email) ON UPDATE CASCADE ON DELETE CASCADE
);
...

How can I build a service with the content of init.sql file already inside the service?

Answer 1

The simplest way would be to add init.sql file to Your docker image:

FROM mysql:latest
ADD init.sql /docker-entrypoint-initdb.d

If You want to provide init.sql during container start instead of build time, You can mount directory containing init.sql into container:

mysql-server:
    container_name: silos-database
    init: true
    restart: always
    build:
      context: .
      dockerfile: Dockerfile-db
    environment:
      - MYSQL_ROOT_PASSWORD=${ROOT_PASSWORD}
      - MYSQL_DATABASE=${DATABASE}
      - MYSQL_USER=${USER}
      - MYSQL_PASSWORD=${USER_PASSWORD}
    ports:
      - target: 3036
        published: 3036
    networks:
      - backend-net
    volumes:
      - type: volume
        source: db_vol
        target: /var/lib/mysql
      - /local/path/with/initsql:/docker-entrypoint-initdb.d