M--S1--S2 级联复制 master—>slave1—>slave2
master需要开启二进制日志 中间的slave1也需要打开二进制日志,但是它默认不把应用master的操作记录到自己的二进制日志。所以需要打开一个参数让它记录,才可以传给第三级的从;然后在中间从和第三级从之间再做一次AB复制就可以了。 打开log-slave-updates=1,让第一台传过来relay日志记录到自己的二进制日志。
先搭建好主从——>然后加入slave2
master 172.16.0.9
slave1 172.16.0.5
slave2 172.16.0.11
关闭防火墙和selinux
hosts文件中三台服务器主机名和ip地址
系统时间需要同步
master和slave的数据库版本保持一致(系统版本保持一致)
先搭建好主从——>然后加入slave2
master和中间slave1必须开启二进制日志
slave2必须开启中继日志
master和slave1和slave2的server-id必须不一样
master和slave的初始数据一致
master:
[root@master /]# vim /etc/hosts
172.16.0.5 slave1
slave1:
[root@slave1 /]# vim /etc/hosts
172.16.0.9 master
172.16.0.11 slave2
slave2:
[root@slave2 /]# vim /etc/hosts
172.16.0.5 slave1
master:
root@master /]# vim /etc/my.cnf
log-bin=mysql-bin
server-id = 1
slave1:
[root@slave1 /]# vim /etc/my.cnf
log-bin=mysql-bin
log-slave-updates=1
server-id = 2
relay-log=/data/DB/relay.log
slave2:
[root@slave2 /]# vim /etc/my.cnf
server-id = 3
relay-log=/data/DB/relay.log
情况1:master和slave都没有业务数据,直接初始化master和slave的数据库 情况2:master上面有业务数据 模拟情况2 停止数据库
[root@master ~]# systemctl stop mysqld
物理级别备份
[root@master /]# cd /data/DB/ && ll
[root@master DB]# tar -cvzf /tmp/mysql.tar.gz *
[root@master DB]# scp /tmp/mysql.tar.gz 172.16.0.5:/tmp
[root@master DB]# scp /tmp/mysql.tar.gz 172.16.0.11:/tmp
slave1和slave2进行数据恢复
[root@slave1 /]# cd /data/DB/ && ll
[root@slave1 DB]# tar -xf /tmp/mysql.tar.gz -C ./
[root@slave1 DB]# systemctl start mysqld
[root@slave2 /]# cd /data/DB/ && ll
[root@slave2 DB]# tar -xf /tmp/mysql.tar.gz -C ./
[root@slave2 DB]# systemctl start mysqld
查看slave和master上面的数据是否一样
[root@master DB]# echo "show databases;" | mysql -uroot -p123456
[root@slave1 DB]# echo "show databases;" | mysql -uroot -p123456
[root@slave2 DB]# echo "show databases;" | mysql -uroot -p123456
创建授权用户
mysql> grant replication slave on *.* to 'slave'@'172.16.0.5' identified by '123456';
查看binglog信息,只有打开二进制日志,这句命令才有结果,表示当前数据库的二进制日志写到什么位置
mysql> show master status \G
*************************** 1. row ***************************
File: mysql-bin.000001
Position: 120
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.01 sec)
slave1:
mysql> change master to master_host='172.16.0.9', master_user='slave', master_password='123456', master_port=3306, master_log_file='mysql-bin.000001', master_log_pos=120;
mysql> start slave;
mysql> show slave status \G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
如果查看状态这两个值都为Yes, 说明M--S就已经做好'
参数说明: master_host: master ip master_user: 同步用户 master_password: 密码 master_port: 端口 master_log_file: master上面查看到的二进制日志名 master_log_pos: master上面查看到的POS值
先停止slave slave1:
mysql> stop slave;
Query OK, 0 rows affected (0.03 sec)
mysql> grant replication slave on *.* to 'slave'@'172.16.0.11' identified by '123456';
mysql> show master status \G
*************************** 1. row ***************************
File: mysql-bin.000004
Position: 120
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
slave2:
mysql> change master to master_host='172.16.0.5', master_user='slave', master_password='123', master_port=3306, master_log_file='mysql-bin.000004', master_log_pos=120;
mysql> start slave;
mysql> show slave status \G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
slave1:
mysql> start slave;
先查看原有的三个服务器的typecho库中的typecho_relationships表, master:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
| 4 | 1 |
+-----+-----+
3 rows in set (0.00 sec)
slave1:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
| 4 | 1 |
+-----+-----+
3 rows in set (0.21 sec)
slave2:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
| 4 | 1 |
+-----+-----+
3 rows in set (0.17 sec)
在master删除一条数据
mysql> delete from typecho.typecho_relationships where cid="4";
Query OK, 1 row affected (0.00 sec)
再次查看
master:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
+-----+-----+
2 rows in set (0.00 sec)
slave1:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
+-----+-----+
2 rows in set (0.00 sec)
slave2:
mysql> select * from typecho_relationships;
+-----+-----+
| cid | mid |
+-----+-----+
| 1 | 1 |
| 3 | 1 |
+-----+-----+
2 rows in set (0.00 sec)
在master上面操作,会同步到slave1上面,相对slave2来说,也等于在slave1上面进行了相同的操作,所有slave2上面也会发生相应的改变