# MySQL 8.0 master/replica compose for two separate servers.
#
# Master server:
#   COMPOSE_PROFILES=master docker compose -f config/docker-compose.mysql-replication.yml up -d
#
# Replica server:
#   MASTER_HOST=<master_public_or_private_ip> COMPOSE_PROFILES=replica docker compose -f config/docker-compose.mysql-replication.yml up -d
#
# Required env on both servers:
#   MYSQL_ROOT_PASSWORD=<strong-root-password>
#   MYSQL_REPLICATION_PASSWORD=<strong-replication-password>
#
# Optional env:
#   MYSQL_DATABASE=ppanel
#   MYSQL_REPLICATION_USER=repl
#   MYSQL_MASTER_PORT=3306
#   MYSQL_REPLICA_PORT=3306
#   MYSQL_SERVER_ID=1     # master default
#   MYSQL_REPLICA_ID=2    # replica default
#
# If the master already has data, import a GTID-aware dump into the replica
# before starting replication. Fresh empty deployments can start master first,
# then replica, then point the application at the master.

services:
  mysql-master:
    image: mysql:8.0
    container_name: ppanel-mysql-master
    profiles:
      - master
    restart: always
    ports:
      - "${MYSQL_MASTER_PORT:-3306}:3306"
    environment:
      MYSQL_ROOT_PASSWORD: "${MYSQL_ROOT_PASSWORD:?please set MYSQL_ROOT_PASSWORD}"
      MYSQL_DATABASE: "${MYSQL_DATABASE:-ppanel}"
      MYSQL_REPLICATION_USER: "${MYSQL_REPLICATION_USER:-repl}"
      MYSQL_REPLICATION_PASSWORD: "${MYSQL_REPLICATION_PASSWORD:?please set MYSQL_REPLICATION_PASSWORD}"
      TZ: Asia/Shanghai
    command:
      - --default-authentication-plugin=mysql_native_password
      - --server-id=${MYSQL_SERVER_ID:-1}
      - --log-bin=mysql-bin
      - --binlog-format=ROW
      - --gtid-mode=ON
      - --enforce-gtid-consistency=ON
      - --log-replica-updates=ON
      - --binlog-expire-logs-seconds=604800
      - --max_connections=1000
      - --character-set-server=utf8mb4
      - --collation-server=utf8mb4_unicode_ci
    volumes:
      - mysql_master_data:/var/lib/mysql
    configs:
      - source: mysql_master_init
        target: /docker-entrypoint-initdb.d/01-create-replication-user.sh
        mode: 0755
    healthcheck:
      test: ["CMD-SHELL", "mysqladmin ping -h 127.0.0.1 -uroot -p$${MYSQL_ROOT_PASSWORD}"]
      interval: 10s
      timeout: 5s
      retries: 10
    logging:
      driver: json-file
      options:
        max-size: 10m
        max-file: "3"

  mysql-replica:
    image: mysql:8.0
    container_name: ppanel-mysql-replica
    profiles:
      - replica
    restart: always
    ports:
      - "${MYSQL_REPLICA_PORT:-3306}:3306"
    environment:
      MYSQL_ROOT_PASSWORD: "${MYSQL_ROOT_PASSWORD:?please set MYSQL_ROOT_PASSWORD}"
      MYSQL_DATABASE: "${MYSQL_DATABASE:-ppanel}"
      TZ: Asia/Shanghai
    command:
      - --default-authentication-plugin=mysql_native_password
      - --server-id=${MYSQL_REPLICA_ID:-2}
      - --relay-log=mysql-relay-bin
      - --read-only=ON
      - --super-read-only=ON
      - --gtid-mode=ON
      - --enforce-gtid-consistency=ON
      - --log-replica-updates=ON
      - --binlog-format=ROW
      - --max_connections=1000
      - --character-set-server=utf8mb4
      - --collation-server=utf8mb4_unicode_ci
    volumes:
      - mysql_replica_data:/var/lib/mysql
    healthcheck:
      test: ["CMD-SHELL", "mysqladmin ping -h 127.0.0.1 -uroot -p$${MYSQL_ROOT_PASSWORD}"]
      interval: 10s
      timeout: 5s
      retries: 10
    logging:
      driver: json-file
      options:
        max-size: 10m
        max-file: "3"

  mysql-replica-init:
    image: mysql:8.0
    container_name: ppanel-mysql-replica-init
    profiles:
      - replica
    restart: "no"
    depends_on:
      mysql-replica:
        condition: service_healthy
    environment:
      MYSQL_ROOT_PASSWORD: "${MYSQL_ROOT_PASSWORD:?please set MYSQL_ROOT_PASSWORD}"
      MYSQL_REPLICATION_USER: "${MYSQL_REPLICATION_USER:-repl}"
      MYSQL_REPLICATION_PASSWORD: "${MYSQL_REPLICATION_PASSWORD:?please set MYSQL_REPLICATION_PASSWORD}"
      MASTER_HOST: "${MASTER_HOST:?please set MASTER_HOST to the master server ip or hostname}"
      MASTER_PORT: "${MASTER_PORT:-3306}"
    entrypoint:
      - /bin/sh
      - -ec
      - |
        mysql -hmysql-replica -uroot -p"$${MYSQL_ROOT_PASSWORD}" <<SQL
        STOP REPLICA;
        CHANGE REPLICATION SOURCE TO
          SOURCE_HOST='$${MASTER_HOST}',
          SOURCE_PORT=$${MASTER_PORT},
          SOURCE_USER='$${MYSQL_REPLICATION_USER}',
          SOURCE_PASSWORD='$${MYSQL_REPLICATION_PASSWORD}',
          SOURCE_AUTO_POSITION=1,
          GET_SOURCE_PUBLIC_KEY=1;
        START REPLICA;
        SQL

configs:
  mysql_master_init:
    content: |
      #!/bin/sh
      set -eu

      mysql -uroot -p"$${MYSQL_ROOT_PASSWORD}" <<SQL
      CREATE USER IF NOT EXISTS '$${MYSQL_REPLICATION_USER}'@'%' IDENTIFIED WITH mysql_native_password BY '$${MYSQL_REPLICATION_PASSWORD}';
      GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO '$${MYSQL_REPLICATION_USER}'@'%';
      FLUSH PRIVILEGES;
      SQL

volumes:
  mysql_master_data:
  mysql_replica_data:
