目录

1、环境设置
2、配置my.cnf配置文件
3、授权允许同步
4、开启slave同步
5、验证互为主从
6、安装keepalived
7、配置keepalived
8、验证

1、环境设置

10.0.0.132 master1
10.0.0.134 master2
setenforce 0
systemctl stop firewalld

2、配置my.cnf配置文件

master1上

vim /etc/my.cnf[client]socket=/usr/local/mysql/mysql.sock[mysqld]basedir=/usr/local/mysqldatadir=/usr/local/mysql/datauser=mysqlpid-file=/usr/local/mysql/data/mysqld.pidlog-error=/usr/local/mysql/data/mysql.errsocket=/usr/local/mysql/mysql.sockport=3306server_id=1log-bin=mysql-bingtid-mode=onenforce-gtid-consistency=1log_slave_updates = 1binlog-format=mixedauto-increment-increment=2          auto-increment-offset=1
systemctl restart mysqld

master2上

vim /etc/my.cnf
[client]socket=/usr/local/mysql/mysql.sock[mysqld]basedir=/usr/local/mysqldatadir=/usr/local/mysql/datauser=mysqlpid-file=/usr/local/mysql/data/mysqld.pidlog-error=/usr/local/mysql/data/mysql.errsocket=/usr/local/mysql/mysql.sockport=3306server_id=2log-bin=mysql-bingtid-mode=onenforce-gtid-consistency=1log_slave_updates = 1binlog-format=mixedauto-increment-increment=2  auto-increment-offset=2
systemctl restart mysqld

3、授权允许同步

master1上

mysql -uroot -p
mysql> grant replication slave on *.* to rep@'10.0.0.%' identified by '123';

master2上

mysql -uroot -p
mysql> grant replication slave on *.* to rep@'10.0.0.%' identified by '123';

4、开启slave同步

master1上

mysql> change master to master_host='10.0.0.134',master_user='rep',master_password='123',master_port=3306,master_autoter_auto_position=1;
mysql> start slave;

master2上

mysql> change master to master_host='10.0.0.132',master_user='rep',master_password='123',master_port=3306,master_autoter_auto_position=1;
mysql> start slave;

5、验证互为主从

master1上

mysql> show slave status\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 10.0.0.134Master_User: repMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.000001Read_Master_Log_Pos: 154Relay_Log_File: master1-relay-bin.000002Relay_Log_Pos: 367Relay_Master_Log_File: mysql-bin.000001Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_Master_Log_Pos: 154Relay_Log_Space: 576Until_Condition: NoneUntil_Log_File: Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error: Last_SQL_Errno: 0Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 2Master_UUID: e59d0925-be6a-11e8-9cab-000c29b63badMaster_Info_File: /usr/local/mysql/data/master.infoSQL_Delay: 0SQL_Remaining_Delay: NULLSlave_SQL_Running_State: Slave has read all relay log; waiting for more updatesMaster_Retry_Count: 86400Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 1Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version:
1 row in set (0.00 sec)

master2上

mysql> show slave status\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 10.0.0.132Master_User: repMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.000001Read_Master_Log_Pos: 154Relay_Log_File: master2-relay-bin.000002Relay_Log_Pos: 367Relay_Master_Log_File: mysql-bin.000001Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_Master_Log_Pos: 154Relay_Log_Space: 576Until_Condition: NoneUntil_Log_File: Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error: Last_SQL_Errno: 0Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1Master_UUID: ceb0ca3d-8366-11e8-ad2b-000c298b7c9aMaster_Info_File: /usr/local/mysql/data/master.infoSQL_Delay: 0SQL_Remaining_Delay: NULLSlave_SQL_Running_State: Slave has read all relay log; waiting for more updatesMaster_Retry_Count: 86400Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 1Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version:
1 row in set (0.00 sec)

6、安装keepalived

master1上

yum -y install keepalived

master2上

yum -y install keepalived

7、配置keepalived

master1上

vim /etc/keepalived/keepalived.conf

global_defs {router_id master1
}vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 100advert_int 1nopreemptauthentication {auth_type PASSauth_pass 1111}   virtual_ipaddress {10.0.0.100 }
}   virtual_server 192.168.1.100 3306 {delay_loop 6lb_algo rr lb_kind DR persistence_timeout 50protocol TCPreal_server 10.0.0.132 3306 {weight 1notify_down /etc/keepalived/bin/mysql.sh                  TCP_CHECK {connect_timeout 3retry 3delay_before_retry 3connect_port 3306}}
}

systemctl enable keepalived
systemctl start keepalived
mkdir /etc/keepalived/bin

vim /etc/keepalived/bin/mysql.sh

#!/bin/bash
pkill keepalived
/sbin/ifdown ens33 && /sbin/ifup ens33

chmod +x /etc/keepalived/bin/mysql.sh

master2上

vim /etc/keepalived/keepalived.conf

global_defs {router_id master2
}vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 50advert_int 1nopreemptauthentication {auth_type PASSauth_pass 1111}   virtual_ipaddress {10.0.0.100 }
}   virtual_server 192.168.1.100 3306 {delay_loop 6lb_algo rr lb_kind DR persistence_timeout 50protocol TCPreal_server 10.0.0.134 3306 {weight 1notify_down /etc/keepalived/bin/mysql.sh                  TCP_CHECK {connect_timeout 3retry 3delay_before_retry 3connect_port 3306}}
}

systemctl enable keepalived
systemctl start keepalived
mkdir /etc/keepalived/bin

vim /etc/keepalived/bin/mysql.sh

#!/bin/bash
pkill keepalived
/sbin/ifdown ens33 && /sbin/ifup ens33

chmod +x /etc/keepalived/bin/mysql.sh

8、最终验证（keepalived双主）

验证一

在master1上

ip addr show ens33可以看到我们设置vip

在master2上

ip addr show ens33没有vip出现

验证二

在两台数据库上授权允许remote用户允许远程登录

master1上

mysql -uroot -p
mysql> grant all on *.* to remote@'%' identified by '123';

master2上

mysql -uroot -p
mysql> grant all on *.* to remote@'%' identified by '123';

另寻找一台MySQL数据库使用vip远程访问数据库集群

查看server_id，图示为1，所以说明我们当前登录到了master1上；也证明了master1如今是active状态的，而master2是备份状态

我们创建创建一个数据库试试

回到master1上

再到master2上查看

这就说明我们的主从复制也是没有问题的

验证三：验证keepalived双主集群的可用性

首先停掉master1上mysqld服务

systemctl stop mysqld

再次查看master1的ens33网卡，vip已经消失

查看master2的ens33网卡，出现vip

再次通过vip远程登录，依然可以登录，而且可以看到server_id变成了2。