MySQL NDB Cluster使用docker compose一键部署

本文主要用来学习MySQL NDB Cluster
解决学习过程中的痛点：需要开启N台VMware虚拟机，电脑不堪重负
使用docker部署，完美解决

本文使用的docker image: mysql/mysql-cluster:8.0

创建mysql_cluster目录，后续操作都在这个目录下

创建docker-compose.yaml

# docker exec -it ndb_management ndb_mgm
# docker exec -it ndb_mysqld1 mysql -uroot -p
# docker exec -it ndb_mysqld2 mysql -uroot -p
version: '3'
networks:
  my_cluster:
    driver: bridge
services:
  # 服务名，在同一个网络下的docker容器之间可以通过服务名访问，
  # 所以我在创建容器以及后面的配置文件中没有指定IP
  ndb_management:
    image: mysql/mysql-cluster:8.0
    # 容器名，docker exec等命令用的
    container_name: ndb_management
    # 容器启动命令
    # command会传给entrypoint.sh并启动不同的服务
    # 这个就只是启动的 ~ $ ndb_mgmd --ndb-nodeid=1 ...
    command: [
      'ndb_mgmd',
      '--ndb-nodeid=1',
      '--reload',
      '--initial'
    ]
    # 容器卷，用来配置集群
    # 集群配置文件为config.cnf
    # 对应到容器里面的/etc/mysql-cluster.cnf，至于为什么，大家可以去看下镜像的源码
    volumes:
      - ./config.cnf:/etc/mysql-cluster.cnf
      - ./my.cnf:/etc/my.cnf
      - ./ndb_mgmd:/var/lib/mysql
    ports:
      - "1186:1186"
    # 指定网络
    networks:
      - my_cluster
  
  ndb_data1:
    image: mysql/mysql-cluster:8.0
    container_name: ndb_data1
    command: [
      'ndbd'
    ]
    volumes:
      - ./config.cnf:/etc/mysql-cluster.cnf
      - ./my.cnf:/etc/my.cnf
      - ./ndbd1:/var/lib/mysql
    networks:
      - my_cluster
  ndb_data2:
    image: mysql/mysql-cluster:8.0
    container_name: ndb_data2
    command: [
      'ndbd'
    ]
    volumes:
      - ./config.cnf:/etc/mysql-cluster.cnf
      - ./my.cnf:/etc/my.cnf
      - ./ndbd2:/var/lib/mysql
    networks:
      - my_cluster
  
  ndb_mysqld1:
    image: mysql/mysql-cluster:8.0
    container_name: ndb_mysqld1
    command: [
      'mysqld',
      '--default-authentication-plugin=mysql_native_password'
    ]
    environment:
      MYSQL_ROOT_PASSWORD: 123456
      MYSQL_DATABASE: mycluster
    volumes:
      - ./config.cnf:/etc/mysql-cluster.cnf
      - ./my.cnf:/etc/my.cnf
      - ./mysql1:/var/lib/mysql
    networks:
      - my_cluster
    ports:
      - "3306:3306"
    depends_on:
      - ndb_management
      - ndb_data1
      - ndb_data2

  ndb_mysqld2:
    image: mysql/mysql-cluster:8.0
    container_name: ndb_mysqld2
    command: [
      'mysqld',
      '--default-authentication-plugin=mysql_native_password'
    ]
    environment:
      MYSQL_ROOT_PASSWORD: 123456
    volumes:
      - ./config.cnf:/etc/mysql-cluster.cnf
      - ./my.cnf:/etc/my.cnf
      - ./mysql2:/var/lib/mysql
    networks:
      - my_cluster
    ports:
      - "3307:3306"
    depends_on:
      - ndb_management
      - ndb_data1
      - ndb_data2

创建my.cnf

# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
# 配置mysqld的初始化和启动参数，像这里我指定ndb_mgmd的地址为docker中的服务名
[mysqld]
ndbcluster
ndb-connectstring=ndb_management
user=mysql

[mysql_cluster]
ndb-connectstring=ndb_management

[ndbd]
connect-string=ndb_management

[ndb_mgm]
connect-string=ndb_management

创建config.cnf

# file "config.ini" - showing minimal setup consisting of 1 data node,
# 1 management server, and 3 MySQL servers.
# The empty default sections are not required, and are shown only for
# the sake of completeness.
# Data nodes must provide a hostname but MySQL Servers are not required
# to do so.
# If you don't know the hostname for your machine, use localhost.
# The DataDir parameter also has a default value, but it is recommended to
# set it explicitly.
# Note: [db], [api], and [mgm] are aliases for [ndbd], [mysqld], and [ndb_mgmd],
# respectively. [db] is deprecated and should not be used in new installations.
# 配置ndb_mgmd启动时的集群相关信息
[ndbd default]
NoOfReplicas= 2

[mysqld  default]
[ndb_mgmd default]
[tcp default]

[ndb_mgmd]
NodeId=1
hostname=ndb_management
DataDir=/var/lib/mysql

[ndbd]
hostname=ndb_data1
DataDir=/var/lib/mysql

[ndbd]
hostname=ndb_data2
DataDir=/var/lib/mysql
# MySQL API 节点不用特意指定hostname
[mysqld]
[mysqld]

完成相关卷目录创建

启动 docker-compose up -d

docker-compose前3行注释写了怎么进入数据库和ndb_mgm

最后MySQL NDB Cluster的最简单的环境已经搭建起来了，鼓掌