本文将通过Clone来实现一个远程从库的搭建：环境如下
Mater: 192.168.3.133 port:3307 doner 捐赠者
Slave: 192.168.3.134 port:3307 recipient 接受者
第一步：两台机器MySQL分别进行初始化安装
进入MySQL软件目录进行初始化安装并修改密码：（MySQL8.0.19 下载解压步骤省略）
[root@mgr2 bin]#cd /zcloud/db/abcMgr/abcMgr02/mysql/bin [root@mgr2 bin]# ./mysqld --initialize --user=mysql [root@mgr2 bin]# ./mysqld_safe --user=mysql & [1] 19556 [root@mgr2 bin]# 2020-03-12T01:32:26.503048Z mysqld_safe Logging to ‘/rock/mysqldata/error.log’. 2020-03-12T01:32:26.536292Z mysqld_safe Starting mysqld daemon with databases from /rock/mysqldata [root@mgr2 bin]# [root@mgr2 bin]# mysql -uroot -p -P3307 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.19 Copyright ? 2000, 2019, 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. root@localhost:(none) 09:33:06 >alter user user() identified by ‘root1234’; Query OK, 0 rows affected (0.00 sec) root@localhost:(none) 09:33:26 >flush privileges; Query OK, 0 rows affected (0.00 sec) root@localhost:(none) 09:33:31 >exit Bye |
第二步：doner节点192.168.3.133相关操作
–创建用户
root@localhost:(none) 10:07:05 >create user ‘donor_user’@‘192.168.3.134’ identified by ‘password’; Query OK, 0 rows affected (0.00 sec) root@localhost:(none) 10:07:07 >grant backup_admin on . to ‘donor_user’@‘192.168.3.134’; Query OK, 0 rows affected (0.01 sec) |
–安装clone插件
root@localhost:(none) 10:23:16 >install plugin clone soname ‘mysql_clone.so’; Query OK, 0 rows affected (0.01 sec) |
第三步：recipient节点192.168.3.134相关操作
–创建用户（也可以不创建用户，用root直接操作）
| mysql> create user ‘recipient_user’@‘192.168.3.134’ identified by ‘password’; |
–安装clone插件
| mysql> grant clone_admin on . to ‘recipient_user’@‘192.168.3.134’; |
–设置参数clone_valid_donor_list
root@localhost:(none) 03:28:40 >set global clone_valid_donor_list=‘192.168.3.133:3307’; Query OK, 0 rows affected (0.00 sec) |
–换成recipient_user’@‘192.168.3.134’ 用户登陆，执行clone语句(这里其实可以用本地root用户直接进行登录操作)
[root@mgr3 bin]# mysql -urecipient_user -ppassword -P3307 -h192.168.3.134 recipient_user@192.168.3.134:(none) 03:39:46 >clone instance from ‘donor_user’@‘192.168.3.133’:3307 identified by ‘password’; Query OK, 0 rows affected (2.34 sec) recipient_user@192.168.3.134:(none) 03:39:57 >Restarting mysqld… 2020-03-12T07:40:01.285267Z mysqld_safe Number of processes running now: 0 2020-03-12T07:40:01.290169Z mysqld_safe mysqld restarted |
至此，远程数据的克隆已经完成了。
通过查询两张表来监控一下克隆的进度和结果状态：
–查看clone进度和状态
root@localhost:(none) 03:34:49 >SELECT * FROM performance_schema.clone_progress; ±-----±----------±----------±---------------------------±---------------------------±--------±----------±----------±----------±-----------±--------------+ | ID | STAGE | STATE | BEGIN_TIME | END_TIME | THREADS | ESTIMATE | DATA | NETWORK | DATA_SPEED | NETWORK_SPEED | ±-----±----------±----------±---------------------------±---------------------------±--------±----------±----------±----------±-----------±--------------+ | 1 | DROP DATA | Completed | 2020-03-12 15:29:15.385694 | 2020-03-12 15:29:15.634609 | 1 | 0 | 0 | 0 | 0 | 0 | | 1 | FILE COPY | Completed | 2020-03-12 15:29:15.634765 | 2020-03-12 15:29:17.452961 | 1 | 465800520 | 465800520 | 465833356 | 0 | 0 | | 1 | PAGE COPY | Completed | 2020-03-12 15:29:17.453144 | 2020-03-12 15:29:17.554224 | 1 | 0 | 0 | 99 | 0 | 0 | | 1 | REDO COPY | Completed | 2020-03-12 15:29:17.554413 | 2020-03-12 15:29:17.654430 | 1 | 2560 | 2560 | 3031 | 0 | 0 | | 1 | FILE SYNC | Completed | 2020-03-12 15:29:17.654596 | 2020-03-12 15:29:17.730172 | 1 | 0 | 0 | 0 | 0 | 0 | | 1 | RESTART | Completed | 2020-03-12 15:29:17.730172 | 2020-03-12 15:29:22.160372 | 0 | 0 | 0 | 0 | 0 | 0 | | 1 | RECOVERY | Completed | 2020-03-12 15:29:22.160372 | 2020-03-12 15:29:22.478889 | 0 | 0 | 0 | 0 | 0 | 0 | ±-----±----------±----------±---------------------------±---------------------------±--------±----------±----------±----------±-----------±--------------+ 7 rows in set (0.00 sec) root@localhost:(none) 03:34:52 >SELECT * FROM performance_schema.clone_status\G *************************** 1. row *************************** ID: 1 PID: 0 STATE: Completed BEGIN_TIME: 2020-03-12 15:29:15.385 END_TIME: 2020-03-12 15:29:22.479 SOURCE: 192.168.3.133:3307 DESTINATION: LOCAL INSTANCE ERROR_NO: 0 ERROR_MESSAGE: BINLOG_FILE: mysql-bin.000002 BINLOG_POSITION: 421 GTID_EXECUTED: 3e75bf2f-6401-11ea-8995-000c29db65a6:1 1 row in set (0.00 sec) |
–在主库133上建立复制账号：
root@localhost:(none) 04:12:23 >create user repl@‘192.168.3.%’ identified by ‘repl’; Query OK, 0 rows affected (0.00 sec) root@localhost:(none) 04:13:03 >grant all on . to repl@‘192.168.3.%’; Query OK, 0 rows affected (0.00 sec) |
–在从库134上进行复制步骤的完成：
root@localhost:(none) 04:16:09 >change master to master_host=‘192.168.3.133’,master_port=3307,master_user=‘repl’,master_password=‘repl’,master_auto_position=1; Query OK, 0 rows affected, 2 warnings (0.00 sec) root@localhost:(none) 04:17:32 >start slave; Query OK, 0 rows affected (0.00 sec) root@localhost:(none) 04:17:35 >show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.3.133 Master_User: repl Master_Port: 3307 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 1193 Relay_Log_File: mgr3-relay-bin.000002 Relay_Log_Pos: 904 Relay_Master_Log_File: mysql-bin.000002 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: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 1193 Relay_Log_Space: 1103 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: Replicate_Ignore_Server_Ids: Master_Server_Id: 207 Master_UUID: 3e75bf2f-6401-11ea-8995-000c29db65a6 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 3e75bf2f-6401-11ea-8995-000c29db65a6:3-4 Executed_Gtid_Set: 3e75bf2f-6401-11ea-8995-000c29db65a6:1-4 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: 1 row in set (0.00 sec) |
至此远程从库通过clone插件的方式搭建成功了，非常简单也非常快速，不需要mysqldump也不需要xtrabackup，在线搭建成功，非常快，以后用8.0可以考虑这种便捷的方式了。
最后将clone技术的 限制条件 列出：
版本大于等于8.0.17且不支持跨版本
两台机器具有相同的操作系统OS
两台MySQL实例具体相同的 innodb_page_size 和 innodb_data_file_path(ibdata文件名)
同一时刻仅仅允许有一个克隆任务存在
recipient 需要设置变量clone_valid_donor_list
max_allowed_packet 大于2M
doner的undo表空间文件名称不能重复
不会克隆my.cnf文件
不会克隆binlog
仅仅支持innodb引擎
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