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
