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content/post/mysql-group-replication.md
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content/post/mysql-group-replication.md
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---
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title: "MySQL 组复制"
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date: 2020-04-28T00:52:00+08:00
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lastmod: 2020-04-28T00:52:00+08:00
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tags: ["mysql", "group", "replication", "组复制"]
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categories: ["database"]
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---
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# 环境
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hostname | ip | os | mysql
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---- | ---- | ---- | ----
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mysql_11 | 192.168.1.11 | centos7.7 | 8.0.19
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mysql_22 | 192.168.1.22 | centos7.7 | 8.0.19
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mysql_33 | 192.168.1.33 | centos7.7 | 8.0.19
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# 安装 mysql
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- 懒得写了 ...
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# 修改 my.cnf
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```
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# mysql_11(选择一个)
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server-id = 11
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# mysql_22(选择一个)
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server-id = 22
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# mysql_33(选择一个)
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server-id = 33
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# 开启 binlog
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log-bin = /var/log/mysql-bin/master
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binlog-format = ROW
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# 关闭 binlog 校验
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binlog-checksum = NONE
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# 保留 2 天的 binlog
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binlog-expire-logs-seconds = 172800
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# 开启 gtid
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gtid-mode = ON
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enforce-gtid-consistency = TRUE
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# 指定 relay-log 存储位置
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relay-log = /var/lib/mysql-bin/slave
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# relay-log 更新计入 binlog
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log-slave-updates = TRUE
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# 多线程执行从库日志(可选)
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slave-parallel-workers = 2
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slave-parallel-type = LOGICAL_CLOCK
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slave-preserve-commit-order = ON
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# 存储引擎只能用 InnoDB
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disabled-storage-engines = "MyISAM,BLACKHOLE,FEDERATED,ARCHIVE,MEMORY"
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# 加载插件，克隆插件用于快速 state transfer
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plugin-load-add = "group_replication.so;mysql_clone.so"
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# 集群 uuid
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group-replication-group-name = "aaaa1111-bbbb-2222-cccc-3333dddd4444"
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# mysql_11(选择一个)
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group-replication-local-address = "192.168.1.11:33061"
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# mysql_22(选择一个)
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group-replication-local-address = "192.168.1.22:33061"
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# mysql_33(选择一个)
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group-replication-local-address = "192.168.1.33:33061"
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# 种子节点
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group-replication-group-seeds = "192.168.1.11:33061,192.168.1.22:33061,192.168.1.33:33061"
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# 新主库在执行完自己的从库日志后，再处理用户的写请求
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group-replication-consistency = BEFORE_ON_PRIMARY_FAILOVER
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# 启动时，不自动创建/初始化新集群
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group-replication-bootstrap-group = OFF
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# 新节点启动时，先不启动组复制，待手动配置完成并确认正常后，再把 OFF 改成 ON
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group-replication-start-on-boot = OFF
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# 怀疑某节点不可用，2秒内，如果该嫌疑节点依旧无响应，则开除它(可选)
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group-replication-member-expel-timeout = 2
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# 2秒内，依旧连接不上主网(majority)，则退出组复制，进入 ERROR 状态(可选)
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group-replication-unreachable-majority-timeout = 2
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# 退出组复制后，不再尝试重新加入组复制，直接执行指定的退出动作(默认)
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group-replication-autorejoin-tries = 0
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# 指定退出动作: 数据库设置超级只读并关闭客户端连接(推荐)
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group-replication-exit-state-action = OFFLINE_MODE
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```
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# 初始化集群
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- 重新启动节点 mysql_11
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```bash
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systemctl restart mysqld
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```
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- 创建同步用户
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```sql
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SET SQL_LOG_BIN = 0;
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CREATE USER rpl_user@'%' IDENTIFIED BY 'password';
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GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%';
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GRANT BACKUP_ADMIN ON *.* TO rpl_user@'%';
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FLUSH PRIVILEGES;
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SET SQL_LOG_BIN = 1;
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```
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- 配置同步信息
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```sql
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CHANGE MASTER TO
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MASTER_USER='rpl_user',
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MASTER_PASSWORD='password'
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FOR CHANNEL 'group_replication_recovery';
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```
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- 启动集群
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```sql
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SET GLOBAL group_replication_bootstrap_group=ON;
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START GROUP_REPLICATION;
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SET GLOBAL group_replication_bootstrap_group=OFF;
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```
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- 查看集群成员(只有一个)
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```sql
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SELECT * FROM performance_schema.replication_group_members;
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```
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- 修改 my.cnf，配置 group-replication-start-on-boot = ON
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# 增加节点
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- 重新启动节点 mysql_22
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```bash
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systemctl restart mysql_22
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```
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- 创建同步用户，与 mysql_11 相同
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```sql
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SET SQL_LOG_BIN = 0;
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CREATE USER rpl_user@'%' IDENTIFIED BY 'password';
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GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%';
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GRANT BACKUP_ADMIN ON *.* TO rpl_user@'%';
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FLUSH PRIVILEGES;
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SET SQL_LOG_BIN = 1;
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```
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- 配置同步信息
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```sql
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CHANGE MASTER TO
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MASTER_USER='rpl_user',
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MASTER_PASSWORD='password'
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FOR CHANNEL 'group_replication_recovery';
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```
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- 启动组复制
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```sql
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START GROUP_REPLICATION;
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```
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- 在 mysql_33 上重复 mysql_22 的步骤
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- 查看集群成员(有三个)
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```sql
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SELECT * FROM performance_schema.replication_group_members;
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```
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- 修改 mysql_22 和 mysql_33 的 my.cnf，配置 group-replication-start-on-boot = ON
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# 注意
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- 每张表都必须显式指定主键
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