实验环境：
DB1:172.16.1.100
DB2:172.16.1.101
VRRIP:172.16.1.99
步骤：
yum -y install mysql
1。修改DB1的mysql配置文件
server-id = 2 #DB1和DB2的id 必须不同
log-bin=mysql-bin #开启mysql的二进制日志功能
read_only=1 #定义主从复制，只读模式
relay-log = mysql-relay-bin #定义中继日志的命名格式
replicate-wild-ignore-table=mysql.% #不复制的数据库或表
replicate-wild-ignore-table=test.% #不复制的数据库或表
replicate-wild-ignore-table=information_schema.% #不复制的数据库或表
2. 在DB1创建复制用户并授权
grant replication slave on *.* to "chen"@"172.16.1.101" identified by "123456";
show master status;
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 | 106 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
3.在DB2的mysql库将DB1设为自己的主服务器
mysql > change master to \
master_host="172.16.1.100",
master_user="chen",
master_password="123456",
master_log_file="mysql-bin.000006",
master_log_pos=106;
4.然后运行
mysql > start slave;
5.查询DB2运行状态
mysql > show slave status;
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.16.1.100
Master_User: chen
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000009
Read_Master_Log_Pos: 106
Relay_Log_File: mysql-relay-bin.000021
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000009
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.%
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 106
Relay_Log_Space: 551
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_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: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec) ERROR:
No query specified
6.然后再DB1和DB2配置上面的配置
7.在DB1和DB2上下载keepalived
yum install keepalived
8.配置keepalived的配置文件
[root@db1 ~]# vim /etc/keepalived/keepalived.conf
[root@db2 ~]# vim /etc/keepalived/keepalived.conf
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.1.99
}
}
virtual_server 172.16.1.99 3306 {
delay_loop 2
#lb_algo rr #LVS算法，用不到，我们就关闭了
#lb_kind DR #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL
persistence_timeout 50 #同一IP的连接60秒内被分配到同一台真实服务器
protocol TCP
real_server 172.16.1.101 3306 { #检测本地mysql，backup也要写检测本地mysql
weight 3
notify_down /usr/local/keepalived/mysql.sh #当mysq服down时，执行此脚本，杀死
keepalived实现切换
TCP_CHECK {
connect_timeout 3 #连接超时
nb_get_retry 3 #重试次数
delay_before_retry 3 #重试间隔时间
}
}
"/etc/keepalived/keepalived.conf" 40L, 1292C written
[root@db2 ~]# vim /etc/keepalived/keepalived.conf
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.1.99
}
}
virtual_server 172.16.1.99 3306 {
delay_loop 2
#lb_algo rr #LVS算法，用不到，我们就关闭了
#lb_kind DR #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL
persistence_timeout 50 #同一IP的连接60秒内被分配到同一台真实服务器
protocol TCP
real_server 172.16.1.101 3306 { #检测本地mysql，backup也要写检测本地mysql
weight 3
notify_down /usr/local/keepalived/mysql.sh #当mysq服down时，执行此脚本，杀死
keepalived实现切换
TCP_CHECK {
connect_timeout 3 #连接超时
nb_get_retry 3 #重试次数
delay_before_retry 3 #重试间隔时间
}
}
8./usr/local/keepalived/mysql.sh
#!/bin/bash
#function:监视mysql主从服务器状态
#written by:alec
#
user=mysql
host=172.16.1.150
password=123
#
check_mysql() {
IO=`/usr/local/mysql/bin/mysql -u$user -p$password -h$host -e 'show slave status\G'|grep IO_Running|tr -s ' '|awk '{print $2}'|grep Yes|wc -l`
SQL=`/usr/local/mysql/bin/mysql -u$user -p$password -h$host -e 'show slave status\G'|grep SQL_Running|tr -s ' '|sed -n '1p'|awk '{print $2}'|grep Yes|wc -l`
if [ "$IO" -eq 1 ]&&[ "$SQL" -eq 1 ]
then
service keepalived status|grep pid
if [ $? -eq 0 ]
then
echo "服务已经启动"
else
service keepalived start
if [ $? -eq 0 ]
then
echo "服务启动成功"
else
echo "服务启动失败"
fi
fi
else
service keepalived status|grep pid
if [ $? -eq 0 ]
then
service keepalived stop
if [ $? -eq 0 ]
then
echo "服务关闭成功"
else
echo "服务关闭失败"
fi
else
echo "服务已经关闭"
fi
fi
}
main(){
check_mysql
}
main;
systemctl start keepalived
------------------------------------
错误一：database doesn't exist' on query. Default database
解决：
1.stop slave;
2.set global sql_slave_skip_counter=1;
3.start slave;