keeplived + mysql双主复制部署 --原创

环境：

master 1:	192.168.100.10	oracle  linux 7.4	mysql 5.7.1
master 2:	192.168.100.11	oracle  linux 7.4	mysql 5.7.1
keepalived VIP	192.168.100.12

配置本地yum仓库

vim /etc/yum.repo.d/public-yum-ol7.repo

[yum_repo]
name=yum_repo
baseurl=file:///share/repo
gpgcheck=
enabled=

安装mysql

检查是否已经安装

rpm -qa | grep mysql

1.mysql安装包安装顺序 安装包有依赖关系必须按照顺序安装

　　1. mysql-community-common-5.7.21-1.el7.x86_64.rpm
　　2. mysql-community-libs-5.7.21-1.el7.x86_64.rpm
　　3. mysql-community-client-5.7.21-1.el7.x86_64.rpm
　　4. mysql-community-server-5.7.21-1.el7.x86_64.rpm

2.初始化mysql 在初始化完成后会生成一个过期的root密码，登录mysql后需要立刻更改，否则无法使用任何命令

rpm -qa | grep mysql

3.启动mysql

systemctl start mysqld

4.查看mysql root密码

cat /var/log/mysqld.log | grep password

5.mysql安全设置 (可选项，可以重置root密码)
　　

mysql_secure_installation

6.登录mysql
　　

mysql -u root -p

7.修改root密码
　　

alter user 'root'@'%' identified by 'Len#qwer';

8.设置root账户永不过期 (可选项)
　　

alter user 'root'@'%' password expire never;

配置双主

修改mysql配置文件c

master1节点

vim /etc/my.cnf

[mysqld]
log-bin=mysql-bin    　#开启二进制日志
server-id= 　　　　　　#设置server-id 主备库必须不同
log_slave_updates=

master2节点

vim /etc/my.cnf

[mysqld]
log-bin=mysql-bin    　　　 #开启二进制日志
server-id=2 　　　　　　　　　#设置server-id 主备库必须不同
log_slave_updates=

2.重启mysql，
master1节点

systemctl restart mysqld

master2节点

systemctl restart mysqld

创建同步用户
master1节点

CREATE USER 'repl'@'192.168.100.11' IDENTIFIED BY 'Phjj#qwer';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.100.11';

master2节点

CREATE USER 'repl'@'192.168.100.10' IDENTIFIED BY 'Phjj#qwer';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.100.10';

查看两个节点的binlog文件名称和post位置，用于配置复制

master1节点

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin. |      619 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
 row in set (0.00 sec)

master2节点

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |     1175 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

master1节点

start slave;

master2节点

start slave;

配置复制

master1节点

CHANGE MASTER TO
MASTER_HOST='192.168.100.11',
MASTER_USER='repl',
MASTER_PASSWORD='Phjj#qwer',
MASTER_LOG_FILE='mysql-bin.000002',
MASTER_LOG_POS=;

master2节点

CHANGE MASTER TO
MASTER_HOST='192.168.100.10',
MASTER_USER='repl',
MASTER_PASSWORD='Phjj#qwer',
MASTER_LOG_FILE='mysql-bin.000004',
MASTER_LOG_POS=;

master1启动复制

start slave;

master2启动复制

start slave;

查看复制状态 Slave_IO_Running,Slave_SQL_Running 状态必须为running才为正常

mysql> show slave status\G;

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

安装Keepalived

yum install -y keepalived

配置keepalived

master1节点

vim  /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
# vrrp_strict
vrrp_garp_interval
vrrp_gna_interval
}

vrrp_instance VI_1 {
state BACKUP
interface ens160
virtual_router_id
priority
advert_int
authentication {
auth_type PASS
auth_pass
}
virtual_ipaddress {
192.168.100.12/
}
}

virtual_server 192.168.100.12 3306 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP

real_server 192.168.100.10 3306 {
weight 3
notify_down /etc/keepalived/kill_keepalived.sh

TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306

}
}
}

master2节点

vim  /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
# vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}

vrrp_instance VI_1 {
state BACKUP
interface ens160
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.100.12/24
}
}

virtual_server 192.168.100.12 3306 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP

real_server 192.168.100.11 3306 {
weight 3
notify_down /etc/keepalived/kill_keepalived.sh

TCP_CHECK { 
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306

}
}
}

配置关闭keepalived脚本

vim /etc/keepalived/kill_keepalived.sh

#!/bin/bash
pkill keepalived

添加执行权限给 关闭keepalived脚本

chmod +x /etc/keepalived/kill_keepalived.sh

查看keepalived VIP地址

ip addr 

UUID相同导致mysql无法进行复制

故障现象

vim /var/log/mysqld.log

--12T02::.499315Z  [Note] Slave SQL thread for channel '' initialized, starting replication in log 'mysql-bin.000001' at position , relay log './ajiamysql1-relay-bin.000001' position:
--12T02::.499839Z  [Note] Slave I/O thread for channel '': connected to master 'repl@192.168.100.11:3306',replication started in log 'mysql-bin.000001' at position
--12T02::.501900Z  [ERROR] Slave I/O for channel '': Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work. Error_code: 

故障原因：直接复制已经安装好mysql的虚拟机导致mysql  UUID相同无法进行复制连接  　　注意：UUID和server_id一样不能相同

故障解决：  修改mysql UUID

[root@ajiamysql1 mysql]# vim /var/lib/mysql/auto.cnf

[auto]
server-uuid=6fe77f0a-eae1-11e7-805e-005056b309100