下文内容主要给大家带来MySQL双主配置讲义，这里所讲到的知识，与书籍略有不同，都是创新互联专业技术人员在与用户接触过程中，总结出来的，具有一定的经验分享价值，希望给广大读者带来帮助。
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结尾2
1.数据库架构图：
2.安装环境信息：
master1 172.16.90.13 CentOS 7.2 Keepalived读 VIP：172.16.90.15
master2 172.16.90.14 CentOS 7.2 Keepalived读 VIP：172.16.90.16
3.MySQL双主配置
master1修改my.cnf,新增如下配置：
server-id=13
log-bin=mysql-bin
sync-binlog=1
binlog-checksum=none
binlog-format=mixed
auto-increment-increment=2
auto-increment-offset=1
log-slave-updates
slave-skip-errors=allmaster2修改my.cnf,新增如下配置：
server-id=14
log-bin=mysql-bin
sync-binlog=1
binlog-checksum=none
binlog-format=mixed
auto-increment-increment=2
auto-increment-offset=1
log-slave-updates
slave-skip-errors=all在master1中为mysql从库账户授权：
grant replication slave on . to 'sync'@'%' identified by 'syncpwd';
flush privileges;
show master status; #当前主库状态,即master1
show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000004 | 599 | | | |
+------------------+----------+--------------+------------------+-------------------+
在master2中为mysql从库账户授权：
grant replication slave on . to 'sync'@'%' identified by 'syncpwd';
flush privileges;
show master status; #当前主库状态,即master2
show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 | 468 | | | |
+------------------+----------+--------------+------------------+-------------------+
在maste1中指定master2为主库：
stop slave;
change master to master_host='172.16.90.14',master_user='sync',master_password='syncpwd',master_log_file='mysql-bin.000002',master_log_pos=468;
flush privileges;
SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; START SLAVE;
start slave;
在maste2中指定master1为主库：
stop slave;
change master to master_host='172.16.90.13',master_user='sync',master_password='syncpwd',master_log_file='mysql-bin.000004',master_log_pos=599;
flush privileges;
SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; START SLAVE;
start slave;
MySQL双主配置完成，验证配置成功：
show slave status\G #master1中显示的信息
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 172.16.90.13
Master_User: sync
Master_Port: 3306
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
show slave status\G #master2中显示的信息
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 172.16.90.14
Master_User: sync
Master_Port: 3306
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
4.Keepalived高可用配置
安装：yum install -y keepalived
启动：systemctl stop keepalived
说明：
当两台云服务器都正常的时候
用户写数据默认访问服务器A，如果A有异常则访问B服务器。
用户读数据默认访问服务器B，如果B有异常则访问A服务器。
服务器A的写数据初始权重为100，B为90
服务器A的读数据初始权重为90，B为100
检测进程检测到异常时，会使得本机的权重下降20
服务器A
vrrp_script chk_master1 {
script "/opt/context/keepalive_check/chk_mysql.sh"
interval 2
weight -20
}
vrrp_instance VI_MASTER1 {
state MASTER
interface eno16780032
virtual_router_id 51
priority 100
mcast_src_ip 172.16.90.13
advert_int 1
authentication {
auth_type PASS
auth_pass 5678
}
virtual_ipaddress {
172.16.90.15
}
track_script {
chk_master1
}
}
vrrp_instance VI_MASTER2 {
state BACKUP
interface eno16780032
virtual_router_id 52
priority 90
mcast_src_ip 172.16.90.13
advert_int 1
authentication {
auth_type PASS
auth_pass 15678
}
virtual_ipaddress {
172.16.90.16
}
}服务器B
vrrp_script chk_master2 {
script "/opt/context/keepalive_check/chk_mysql.sh"
interval 2
weight -20
}
vrrp_instance VI_MASTER1 {
state BACKUP
interface eno16780032
virtual_router_id 51
priority 90
mcast_src_ip 172.16.90.14
advert_int 1
authentication {
auth_type PASS
auth_pass 5678
}
virtual_ipaddress {
172.16.90.15
}
}
vrrp_instance VI_MASTER2 {
state MASTER
interface eno16780032
virtual_router_id 52
priority 100
mcast_src_ip 172.16.90.14
advert_int 1
authentication {
auth_type PASS
auth_pass 15678
}
virtual_ipaddress {
172.16.90.16
}
track_script {
chk_master2
}
}检测脚本
#!/bin/bash counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l) if [ "${counter}" -eq 0 ]; then systemctl stop keepalived
fi
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