實驗環境：

server2 為 server3 的 master

server3 為 server1 的 master

即server1、2、3的身份如下：

server2：master

server3：master / slave

server2：slave

由于先前做過其他數據庫實驗，環境是server2為master, server1和server3為slave

實驗操作：

server1、2、3配置文件修改如下：

• server2
  
• server3
  
• server1
  
  
• server3

mysql> grant replication slave on *.* to 'tutu'@'172.25.54.%' identified by '5820hhXM!@#'; Query OK, 0 rows affected, 1 warning (0.05 sec)

• server1

mysql> change master to master_host='172.25.54.3',master_user='tutu',master_password='5820hhXM!@#',master_auto_position=1; Query OK, 0 rows affected, 2 warnings (0.17 sec)

若出現Slave_SQL_Running: No
(原因：數據不同步，
在 server3 上 reset msater;
server1 上 shop slave; –> reset slave; –>start slave;)

• server3
  
• server1
  

測試

• server2

mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 4 rows in set (0.00 sec)mysql> create database test; Query OK, 1 row affected (0.13 sec)mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | | test | +--------------------+ 5 rows in set (0.00 sec)

• server3 和 server1
  
• server2

mysql> use test; Database changed mysql> create table userlist (-> username varchar(15) not null,-> password varchar(25) not null); Query OK, 0 rows affected (0.41 sec)mysql> desc userlist; +----------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+-------+ | username | varchar(15) | NO | | NULL | | | password | varchar(25) | NO | | NULL | | +----------+-------------+------+-----+---------+-------+ 2 rows in set (0.01 sec)mysql> insert into userlist values ('user1','147'); Query OK, 1 row affected (0.09 sec)mysql> insert into userlist values ('user2','258'); Query OK, 1 row affected (0.16 sec)mysql> insert into userlist values ('user3','369'); Query OK, 1 row affected (0.08 sec)mysql> select * from userlist; +----------+----------+ | username | password | +----------+----------+ | user1 | 147 | | user2 | 258 | | user3 | 369 | +----------+----------+ 3 rows in set (0.00 sec)mysql> Bye [root@server2 ~]#

• server3 和 server1
  
  注：bin log索引文件: /var/lib/mysql/mysql-bin.index
  查看二進制日志：mysqlbinlog -vv –base64-output=DECODE-ROWS mysql-bin.000006 //-vv詳細顯示，–base64查看加密的數據

并行復制

• server3——單線程–>多線程工作
  mysql> show processlist;
  

[root@server3 ~]# vim /etc/my.cnf [root@server3 ~]# cat /etc/my.cnf | tail -n 11 server-id=3 log-bin=mysql-bin log-slave-updatesgtid_mode=ON enforce-gtid-consistency=true slave-parallel-type=LOGICAL_CLOCK slave-parallel-workers=16 master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_recovery=ON [root@server3 ~]# /etc/init.d/mysqld restart Stopping mysqld: [ OK ] Starting mysqld: [ OK ] [root@server3 ~]# mysql -p5820hhXM\!\@# mysql: [Warning] Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 23 Server version: 5.7.17-log MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> show processlist; +----+-------------+---------------+------+------------------+-------+---------------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-------------+---------------+------+------------------+-------+---------------------------------------------------------------+------------------+ | 1 | system user | | NULL | Connect | 58 | Slave has read all relay log; waiting for more updates | NULL | | 2 | system user | | NULL | Connect | 60 | Waiting for master to send event | NULL | | 3 | system user | | NULL | Connect | 83590 | Waiting for an event from Coordinator | NULL | | 4 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 6 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 7 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 8 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 9 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 10 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 11 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 12 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 13 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 16 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 17 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 18 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 19 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 20 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 21 | system user | | NULL | Connect | 60 | Waiting for an event from Coordinator | NULL | | 22 | tutu | server1:48836 | NULL | Binlog Dump GTID | 5 | Master has sent all binlog to slave; waiting for more updates | NULL | | 23 | root | localhost | NULL | Query | 0 | starting | show processlist | +----+-------------+---------------+------+------------------+-------+---------------------------------------------------------------+------------------+ 20 rows in set (0.00 sec)

總結

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