Mycat（三）读写分离双主双从

文章目录

搭建双主双从
- 双主机配置
- 双从机配置
- 双从配置
- 两个主机互相复制
- 停止从服务复制功能
- 重新配置主从
修改 Mycat 的集群配置实现多种主从
- 双主双从集群角色划分
- 增加两个数据源
- 修改集群配置文件
- 读写分离配置扩展
- - （1）读写分离(一主一从,无备)(m是主,s是从)
  - （2）读写分离(一主一从,一备)(m是主,s是从备)
  - （3）读写分离(一主一从,一备)(m是主,s是从,b是备)
  - （4）MHA(一主一从,一备)(m是主,s是从,b是备,READ_ONLY判断主)
  - （5）MGR(一主一从,一备)(m是主,s是从,b是备,READ_ONLY判断主)
  - （6）GARELA_CLUSTER(一主一从,一备)(m是主,s是从,b多主)

本篇和Mycat（二）中搭建一主一从内容上部分重合，记录一下集群配置
https://www.bilibili.com/video/BV1iT41157JX/

搭建双主双从

一个主机 m1 用于处理所有写请求，它的从机 s1 和另一台主机 m2 还有它的从机 s2负责所有读请求。当 m1 主机宕机后，m2 主机负责写请求，m1、m2 互为备机。
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编号	角色	IP 地址	机器名
1	Master1	192.168.140.100	atguigu01
2	Slave1	192.168.140.99	atguigu02
3	Master2	192.168.140.98	atguigu03
4	Slave2	192.168.140.97	atguigu04

双主机配置

可参考Mycat（二）中的配置，注意log-slave-updates、auto-increment-increment、auto-increment-offset

Master1配置

#主服务器唯一ID
server-id=1
#启用二进制日志
log-bin=mysql-bin
# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
#设置需要复制的数据库(不填即全部)
binlog-do-db=需要复制的主数据库名字
#设置logbin格式
binlog_format=STATEMENT
# 在作为从数据库的时候，有写入操作也要更新二进制日志文件
log-slave-updates
#表示自增长字段每次递增的量，指自增字段的起始值，其默认值是1，取值范围是
1 .. 65535
auto-increment-increment=2
# 表示自增长字段从哪个数开始，指字段一次递增多少，他的取值范围是1 .. 65535
auto-increment-offset=1

Master2配置

vim /etc/my.cnf
#主服务器唯一ID
server-id=3
#启用二进制日志
log-bin=mysql-bin
# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
#设置需要复制的数据库
binlog-do-db=需要复制的主数据库名字
#设置logbin格式
binlog_format=STATEMENT
# 在作为从数据库的时候，有写入操作也要更新二进制日志文件
log-slave-updates
#表示自增长字段每次递增的量，指自增字段的起始值，其默认值是1，取值范围是
1 .. 65535
auto-increment-increment=2
# 表示自增长字段从哪个数开始，指字段一次递增多少，他的取值范围是1 .. 65535
auto-increment-offset=2

双从机配置

vim /etc/my.cnf
#从服务器唯一ID
server-id=2
#启用中继日志
relay-log=mysql-relay
Slave2配置
修改配置文件：vim /etc/my.cnf
#从服务器唯一ID
server-id=4
#启用中继日志
relay-log=mysql-relay

双主机、双从机重启 mysql 服务
主机从机都关闭防火墙
在两台主机上建立帐户并授权 slave

#在主机MySQL里执行授权命令
CREATE USER 'slave2'@'%' IDENTIFIED BY '123123';
GRANT REPLICATION SLAVE ON *.* TO 'slave2'@'%';
#此语句必须执行。否则见下面。
ALTER USER 'slave2'@'%' IDENTIFIED WITH mysql_native_password BY '123123';

#查询Master1的状态
show master status;#查询Master2的状态
show master status;

分别记录下File和Position的值
执行完此步骤后不要再操作主服务器MYSQL，防止主服务器状态值变化

双从配置

Slava1 复制 Master1，Slava2 复制 Master2

Slava1的复制命令

#复制主机的命令
CHANGE MASTER TO MASTER_HOST='主机的IP地址',
MASTER_USER='slave',
MASTER_PASSWORD='123123',
MASTER_LOG_FILE='mysql-bin.具体数字',MASTER_LOG_POS=具体值;

Slava1的复制命令
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Slava2的复制命令
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#启动两台从服务器复制功能
start slave;
#查看从服务器状态
show slave status\G;

#下面两个参数都是Yes，则说明主从配置成功！
# Slave_IO_Running: Yes
# Slave_SQL_Running: Yes

两个主机互相复制

Master2 复制 Master1，Master1 复制 Master2

Master2的复制命令
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Master1的复制命令
在这里插入图片描述

#启动两台从服务器复制功能
start slave;
#查看从服务器状态
show slave status\G;

停止从服务复制功能

stop slave;

重新配置主从

stop slave;
reset master;

修改 Mycat 的集群配置实现多种主从

Mycat2.0的特点是集群概念，和mysql主从复制、集群配合实现多节点读写分离

双主双从集群角色划分

*m1：主机
*m2：备机，也负责读
*s1，s2：从机

增加两个数据源

/*+ mycat:createDataSource{ "name":"rwSepw2",
"url":"jdbc:mysql://192.168.140.98:3306/mydb1?useSSL=false&characterEncodin
g=UTF-8&useJDBCCompliantTimezoneShift=true", "user":"root",
"password":"123123" } */;
/*+ mycat:createDataSource{ "name":"rwSepr2",
"url":"jdbc:mysql://192.168.140.97:3306/mydb1?useSSL=false&characterEncodin
g=UTF-8&useJDBCCompliantTimezoneShift=true", "user":"root",
"password":"123123" } */;

修改集群配置文件

vim /usr/local/mycat/conf/clusters/prototype.cluster.json
{"clusterType": "MASTER_SLAVE","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["rwSepw","rwSepw2"],"replicas": ["rwSepw2","rwSepr","rwSepr2"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

重启Mycat生效

读写分离配置扩展

通过对集群配置的修改，可以根据需求实现更多种情况的读写分离配置，总结如下

（1）读写分离(一主一从,无备)(m是主,s是从)

{"clusterType": "MASTER_SLAVE","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

（2）读写分离(一主一从,一备)(m是主,s是从备)

{"clusterType": "MASTER_SLAVE","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m","s"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

（3）读写分离(一主一从,一备)(m是主,s是从,b是备)

{"clusterType": "MASTER_SLAVE","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m","b"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

（4）MHA(一主一从,一备)(m是主,s是从,b是备,READ_ONLY判断主)

{"clusterType": "MHA","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m","b"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

（5）MGR(一主一从,一备)(m是主,s是从,b是备,READ_ONLY判断主)

{"clusterType": "MGR","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m","b"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}

（6）GARELA_CLUSTER(一主一从,一备)(m是主,s是从,b多主)

{"clusterType": "GARELA_CLUSTER","heartbeat": {"heartbeatTimeout": 1000,"maxRetryCount": 3,"minSwitchTimeInterval": 300,"slaveThreshold": 0},"masters": ["m","b"],"replicas": ["s"],"maxCon": 200,"name": "prototype","readBalanceType": "BALANCE_ALL","switchType": "SWITCH","timer": {"initialDelay": 30,"period": 5,"timeUnit": "SECONDS"}
}