一、MySQL主主同步
需要两台虚拟机192.168.200.111、192.168.200.112
1、第1台机器：
[root@localhost ~]# vim /etc/my.cnf
server-id=1
log-bin=mysql-binlog
log-slave-updates=true
max_binlog_size=1024M
auto_increment_offset = 1
auto_increment_increment = 2
replicate-ignore-db = information_schema
replicate-ignore-db = performance_schema
replicate-ignore-db = test
replicate-ignore-db = mysql
max_connections = 3000
max_connect_errors = 30
skip-character-set-client-handshake
init-connect='SET NAMES utf8'
character-set-server=utf8
wait_timeout=1800
interactive_timeout=1800
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
relay-log=relay-log-bin
relay-log-index=slave-relay-bin.index
[root@localhost ~]# systemctl restart mariadb
[root@localhost ~]# mysql
MariaDB [(none)]> grant replication slave on *.* to 'repl'@'192.168.200.112' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show master status;
2、第2台机器：
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
server-id= 2
log-bin=mysql-binlog
log-slave-updates=true
max_binlog_size=1024M
auto_increment_offset = 2
auto_increment_increment = 2#偶数ID
replicate-ignore-db = information_schema
replicate-ignore-db = performance_schema
replicate-ignore-db = test
replicate-ignore-db = mysql
max_connections = 3000
max_connect_errors = 30
skip-character-set-client-handshake
init-connect='SET NAMES utf8'
character-set-server=utf8
wait_timeout=1800
interactive_timeout=1800
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
relay-log=relay-log-bin
relay-log-index=slave-relay-bin.index
[root@localhost ~]# systemctl restart mariadb
[root@localhost ~]# mysql
MariaDB [(none)]> grant replication slave on *.* to 'repl'@'192.168.200.111' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show master status;
3、测试：
（1）第1台机器
MariaDB [(none)]> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
MariaDB [(none)]> change master to master_host='192.168.200.112',master_port=3306,master_user='repl',master_password='123',master_log_file='mysql-binlog.000001',master_log_pos=486;
Query OK, 0 rows affected (0.04 sec)
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> show slave status\G
（2）第2台机器
MariaDB [(none)]> stop slave;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> change master to master_host='192.168.200.111',master_port=3306,master_user='repl',master_password='123',master_log_file='mysql-binlog.000004',master_log_pos=486;
Query OK, 0 rows affected (0.13 sec)
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> show slave status\G
4、创建文件测试：
第1台机器
MariaDB [(none)]> create database test01;
Query OK, 1 row affected (0.01 sec)
第2台机器
MariaDB [(none)]> show databases; //里面有在第一台机器上创建的表
MariaDB [(none)]> create database test02;
Query OK, 1 row affected (0.00 sec)
第1台机器
MariaDB [(none)]> show databases; //里面有在第二台机器上创建的表
二、MySQL主主高可用方案
1、111配置：
[root@localhost ~]# yum -y install keepalived
[root@localhost ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_MASTER-A
}
vrrp_script mysql {
script "/opt/mysql.sh"
interval 2
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens32
virtual_router_id 51
priority 100
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
mysql
}
virtual_ipaddress {
192.168.200.254
}
}
2、写脚本：
[root@localhost ~]# vim /opt/mysql.sh
#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]; then
systemctl stop keepalived
fi
3、加权、启动、查看
[root@localhost ~]# chmod +x /opt/mysql.sh
[root@localhost ~]# systemctl start keepalived
[root@localhost ~]# ip a | grep eno16777728
4、112配置：
在111上操作：
[root@localhost ~]# scp /etc/keepalived/keepalived.conf 192.168.200.112:/etc/keepalived/
[root@localhost ~]# scp /opt/mysql.sh 192.168.200.112:/opt/
112：
[root@localhost ~]# yum -y install keepalived
[root@localhost ~]# vim /etc/keepalived/keepalived.conf //稍作调整
! Configuration File for keepalived
global_defs {
router_id LVS_MASTER-B
}
vrrp_script mysql {
script "/opt/mysql.sh"
interval 2
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens32
virtual_router_id 51
priority 99
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
mysql
}
virtual_ipaddress {
192.168.200.254
}
}
[root@localhost ~]# chmod +x /opt/mysql.sh
[root@localhost ~]# systemctl start keepalived
5、测试VIP转移
先用ip -a查看111上有没有254：
然后停掉服务：
[root@localhost ~]# systemctl stop mariadb
112：ip -a //发现254转移到了112上
6、在远程客户端测试
（1）111、112都进入mysql
[root@localhost ~]# mysql
MariaDB [(none)]> grant all on *.* to 'root'@'192.168.200.%' identified by '123456';
MariaDB [(none)]> flush privileges;
（2）通过VIP登录测试：
[root@localhost ~]# mysql -uroot -p123 -h 192.168.200.254
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5796
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases; //里面有之前创建的表
