(1)参数理解
由M-S 搭建M-2S
--slave-info，会打印binary log的位置和master server名，并且以change master的方式写到xtrabackup_slave_info中。
--safe-slave-backup,为了保证复制状态的一致性，这个选项会关闭slave sql线程，等待直到SHOW STATUS 中的Slave_open_temp_tabls为了才启动备份。如果等待时间超过—safe-slave-backup-timeout就会报
错默认300秒。备份成功后 slave sql thread会自动启动。
（2）主-从，在从库上备份数据库，新建主库的一个从库
10.10.6.87 dg2 主
10.10.6.86 dg 从
10.10.6.90 dgt 从
主库的10.10.6.87 master的信息
mysql> show master status G;
*************************** 1. row ***************************
File: mysql-bin.000025
Position: 1046
Binlog_Do_DB:
Binlog_Ignore_DB: mysql,information_schema
Executed_Gtid_Set:
1 row in set (0.00 sec)
10.10.6.86 从库的master信息：
mysql> show master status G;
*************************** 1. row ***************************
File: mysql-bin.000019
Position: 680
Binlog_Do_DB:
Binlog_Ignore_DB: mysql,information_schema
Executed_Gtid_Set:
1 row in set (0.00 sec)
10.10.6.86 从库的信息：
mysql> show slave status G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.10.6.87
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000025
Read_Master_Log_Pos: 1046
Relay_Log_File: mysql-bin.000021
Relay_Log_Pos: 1436
Relay_Master_Log_File: mysql-bin.000025
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql
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: 1522
Relay_Log_Space: 1637
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: 2
Master_UUID: 8f9e146f-0a18-11e7-810a-0050568833c8
Master_Info_File: /var/lib/mysql/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:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
备库上备份整个库
[root@dg backup]# innobackupex --defaults-file=/etc/my.cnf --user=backup --password='bc.123456' --socket=/var/lib/mysql/mysql.sock --slave-info --safe-slave-backup --no-timestamp /backup/full
注意：
备份源库上恢复日志也可以不在备份源上 必要时加上reset slave all 或者加上reset master all
备份完成后，还不能用于恢复，一些未提交的事物需要恢复，需要恢复redo logo的数据，确保数据一致
[root@dg backup]# innobackupex --apply-log /backup/full
传输数据到新的备库
[root@dg backup]# scp -r full/ dgt:/backup/
（3）在新建的S 恢复机清理目录
service mysqld stop
mv /var/lib/mysql /var/lib/mysql6
（4）拷贝数据文件到目录：
innobackupex --defaults-file=/etc/my.cnf --copy-back --rsync /backup/full
[root@dgt mysql]# chown -R mysql.mysql /var/lib/mysql
[root@dgt lib]# service mysqld start
[root@dgt lib]# cd /backup/full
重点的重点，切记不要去查看show master status的pos位置，这是用xrabackup备份的，查看下面的位置
[root@dgt full]# cat xtrabackup_slave_info
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000025', MASTER_LOG_POS=1046
(5) 修改从库的检查点位置
CHANGE MASTER TO master_host='10.10.6.87', master_port=3306, master_user='rep',master_password='bc.123456', master_log_file='mysql-bin.000025', master_log_pos=1046;
start slave;
主库上的用户
GRANT REPLICATION SLAVE ON *.* TO 'rep'@'10.10.6.%' IDENTIFIED BY 'bc.123456';
（6）查看状态
mysql> show slave status G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.10.6.87
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000025
Read_Master_Log_Pos: 1046
Relay_Log_File: mysql-bin.000003
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000025
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,information_schema
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: 1046
Relay_Log_Space: 521
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: 2
Master_UUID: 8f9e146f-0a18-11e7-810a-0050568833c8
Master_Info_File: /var/lib/mysql/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:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
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原文链接：https://blog.csdn.net/wll_1017/article/details/70213115