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