官方文件

https://www.percona.com/doc/percona-xtradb-cluster/5.6/index.html

Benefits:

• When you execute a query, it is executed locally on the node. All data is available locally, no need for remote access.
• No central management. You can loose any node at any point of time, and the cluster will continue to function.
• Good solution for scaling a read workload. You can put read queries to any of the nodes.

本叢集採用多主同步結構（multi-master）,部署3個master節點，任意一個節點上都可以進行讀寫操作。

叢集特性

• 實現mysql資料庫叢集架構的高可用性和資料的強一致性。
• 完成了真正的多節點讀寫的叢集方案。
• 改善了傳統意義上的主從複製延遲問題，真正達到了實時同步。
• 新加入的節點可以自動部署，無須提供手動備份，維護起來很方便。
• 由於是多節點寫入，所以資料庫故障切換很容易。

叢集架構

部署步驟

node1

./docker-compose -f MySQL-PXC-MASTER.yaml up -d

version: "3.7"
services:
  MySQLPXC_node:
    image: 1573927589/mysql:percona-xtradb-cluster-5.6.50
    network_mode: "host"
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: "Single&2020"
      CLUSTER_NAME: "PXC" 
      XTRABACKUP_PASSWORD: 123456
      MYSQL_USER: "single"
      MYSQL_PASSWORD: "Single&2020"
      MYSQL_DATABASE: "scplatform_node"
    command: [
      '--character-set-server=utf8mb4',
      '--collation-server=utf8mb4_unicode_ci'
    ]
    volumes:
      - mysqldata:/var/lib/mysql

node2

export MASTER_IP=10.3.192.29
docker-compose -f MySQL-PXC-node.yaml up -d
version: "3.7"
services:
  MySQLPXC_node:
    image: dockerhub.test.wacai.info/fmpc/percona-xtradb-cluster:5.6.50
    network_mode: "host"
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: "Single&2020"
      CLUSTER_NAME: "PXC" 
      XTRABACKUP_PASSWORD: 123456
      CLUSTER_JOIN: $MASTER_IP
      MYSQL_USER: "single"
      MYSQL_PASSWORD: "Single&2020"
    command: [
      '--character-set-server=utf8mb4',
      '--collation-server=utf8mb4_unicode_ci'
    ]
    volumes:
      - mysqldata:/var/lib/mysql

node3

和node2一樣

叢集擴容

增加一個部署節點即可

export MASTER_IP=10.3.192.29
docker-compose -f MySQL-PXC-node.yaml up -d