MySQL伪master+Binlog+同步【转】-白红宇

MySQL伪master+Binlog+同步【转】

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发布时间：2019-06-14

本文共 10761 字，大约阅读时间需要 35 分钟。

MySQL 中drop 等高危误操作后恢复方法

实验目的:

本次实验以恢复drop操作为例,使用不同方法进行误操作的数据恢复.

方法:

:伪master+Binlog+同步(本文)

1.环境

mysql 5.7.23-log

master db210(192.168.99.210)

slave db212(192.168.99.212)

伪装master db210:3507

临时slave:db211(192.168.99.211)

压力:在做本次实验过程用,使用sysbench同时做读写模拟压力(28thread+10*100000行)

2.本实验的前置条件:

在drop前至少有一次全量备份

从全备到drop操作时间点有全程binlog,并且binlog format='row'
如果没有以上两个备份怎么办?见《无备份的误操作恢复方法》

3.模拟误操作

root@localhost [wenyz]>select count(*) from t2;+----------+ | count(*) | +----------+ | 163818 | +----------+ 1 row in set (0.12 sec) root@localhost [wenyz]>drop table t2; Query OK, 0 rows affected (0.02 sec) root@localhost [wenyz]>show master status; +------------------+-----------+--------------+------------------+------------------------------------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+-----------+--------------+------------------+------------------------------------------------+ | mysql-bin.000020 | 136445791 | | | 9e912d2b-92f6-11e8-9747-0050568be82c:1-9872111 | +------------------+-----------+--------------+------------------+------------------------------------------------+ 1 row in set (0.00 sec) root@localhost [wenyz]>flush logs; Query OK, 0 rows affected (1.41 sec)

4.在实验不同方法之前先完成以下步骤:

复制全备份和所有binlog文件到空闲服务器:db211上

以全备恢复到一个临时新实例(临时slave).

5.找到误操作的位置(GTID或binlog pos)

通过查找怀疑的binlog:[root@db210_19:11:07 /data/57mysql/mysql3506/logs] #lltotal 75564544-rw-r----- 1 mysql mysql       177 Jul 29 14:14 mysql-bin.000001...-rw-r----- 1 mysql mysql  39336996 Jul 29 19:12 mysql-bin.000020-rw-r----- 1 mysql mysql     13340 Jul 29 19:12 mysql-bin.index[root@db210_19:12:48 /data/57mysql/mysql3506/logs] binlog文件导出命令:#mysqlbinlog -v --base64-output=auto /data/57mysql/mysql3506/logs/mysql-bin.000020 >/data/backup/20.sql binlog文件导出后查找:DROP TABLE `t2`: 在mysql-bin.000020中找到对应位置: # at 97871478 #180731 19:33:29 server id 1853506 end_log_pos 97871543 CRC32 0x8cd4354d GTID last_committed=205567 sequence_number=205570 rbr_only=no original_committed_timestamp=0 immediate_commit_timestamp=0 transaction_length=0 # original_commit_timestamp=0 (1970-01-01 08:00:00.000000 CST) # immediate_commit_timestamp=0 (1970-01-01 08:00:00.000000 CST) /*!80001 SET @@session.original_commit_timestamp=0*//*!*/; SET @@SESSION.GTID_NEXT= '9e912d2b-92f6-11e8-9747-0050568be82c:9791090'/*!*/; # at 97871543 #180731 19:33:29 server id 1853506 end_log_pos 97871660 CRC32 0x974a86d8 Query thread_id=35 exec_time=0 error_code=0 use `wenyz`/*!*/; SET TIMESTAMP=1533036809/*!*/; /*!\C utf8 *//*!*/; SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=33/*!*/; DROP TABLE `t2` /* generated by server */ /*!*/; # at 97871660 #180731 19:33:29 server id 1853506 end_log_pos 97871725 CRC32 0xb85257d6 GTID last_committed=205567 sequence_number=205571 rbr_only=yes original_committed_timestamp=0 immediate_commit_timestamp=0 transaction_length=0 /*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/; # original_commit_timestamp=0 (1970-01-01 08:00:00.000000 CST) # immediate_commit_timestamp=0 (1970-01-01 08:00:00.000000 CST) /*!80001 SET @@session.original_commit_timestamp=0*//*!*/; SET @@SESSION.GTID_NEXT= '9e912d2b-92f6-11e8-9747-0050568be82c:9791091'/*!*/; # at 97871725

恢复方法二：

初始化一个空实例(用于伪master),并配置同步账号:

[root@db210_00:22:09 /data/57mysql/mysql3507/data]  #/usr/local/mysql57/bin/mysqld --defaults-file=/data/57mysql/mysql3507/my3506.cnf --initialize[root@db210_00:22:30 /data/57mysql/mysql3507/data]  #cat error.log |grep pass2018-07-31T16:22:28.157717Z 1 [Note] A temporary password is generated for root@localhost: ?NqFa+vJZ9U_[root@db210_00:22:45 /data/57mysql/mysql3507/data]  #/usr/local/mysql57/bin/mysqld --defaults-file=/data/57mysql/mysql3507/my3506.cnf&[2] 19851[root@db210_00:22:59 /data/57mysql/mysql3507/data]  #mysql -S /tmp/mysql3507.sock -p Enter password: Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. (unknown)@localhost [(none)]>alter user user() identified by 'xxxx'; Query OK, 0 rows affected (0.00 sec) root@localhost [(none)]>grant all on *.* to 'wyz'@'%' identified by 'xxxx'; Query OK, 0 rows affected, 1 warning (0.00 sec)

关闭伪master实例

root@localhost [(none)]>shutdown;Query OK, 0 rows affected (0.00 sec)

复制binlog并伪装binlog环境
- 删除初始binlog,复制备份binlog文件
- 制作mysql-bin.index文件,并修改logs目录下所有文件权限为mysql:mysql

[root@db210_00:24:25 /data/57mysql/mysql3507/logs]  #lltotal 12-rw-r----- 1 mysql mysql 177 Aug  1 00:22 mysql-bin.000001-rw-r----- 1 mysql mysql 716 Aug  1 00:24 mysql-bin.000002-rw-r----- 1 mysql mysql  92 Aug  1 00:23 mysql-bin.index[root@db210_00:24:26 /data/57mysql/mysql3507/logs]  #rm -rf mysql-bin.0*#ls /data/57mysql/mysql3507/logs/mysql-bin.0* >mysql-bin.index #chown mysql:mysql *#cat mysql-bin.index /data/57mysql/mysql3507/logs/mysql-bin.000010 /data/57mysql/mysql3507/logs/mysql-bin.000011 /data/57mysql/mysql3507/logs/mysql-bin.000012 /data/57mysql/mysql3507/logs/mysql-bin.000013 /data/57mysql/mysql3507/logs/mysql-bin.000014 /data/57mysql/mysql3507/logs/mysql-bin.000015 /data/57mysql/mysql3507/logs/mysql-bin.000016 /data/57mysql/mysql3507/logs/mysql-bin.000017 /data/57mysql/mysql3507/logs/mysql-bin.000018 /data/57mysql/mysql3507/logs/mysql-bin.000019 /data/57mysql/mysql3507/logs/mysql-bin.000020 [root@db210_00:29:28 /data/57mysql/mysql3507/logs] #ll total 2874136 -rw-r----- 1 mysql mysql 268435555 Aug 1 00:25 mysql-bin.000010 -rw-r----- 1 mysql mysql 268442595 Aug 1 00:25 mysql-bin.000011 -rw-r----- 1 mysql mysql 268442419 Aug 1 00:25 mysql-bin.000012 -rw-r----- 1 mysql mysql 268437857 Aug 1 00:25 mysql-bin.000013 -rw-r----- 1 mysql mysql 268438414 Aug 1 00:25 mysql-bin.000014 -rw-r----- 1 mysql mysql 268437131 Aug 1 00:25 mysql-bin.000015 -rw-r----- 1 mysql mysql 268436889 Aug 1 00:25 mysql-bin.000016 -rw-r----- 1 mysql mysql 268437011 Aug 1 00:25 mysql-bin.000017 -rw-r----- 1 mysql mysql 268441823 Aug 1 00:25 mysql-bin.000018 -rw-r----- 1 mysql mysql 268439288 Aug 1 00:25 mysql-bin.000019 -rw-r----- 1 mysql mysql 258700685 Aug 1 00:25 mysql-bin.000020 -rw-r----- 1 mysql mysql 506 Aug 1 00:25 mysql-bin.index

启动伪装master实例,确认相关信息
-注意show master status中有一个增加了eaba29d3-94dd-11e8-91bf-0050568be82c:1-2,需要在slave 中gtid purged掉,否则会报1236错误(因为刚才新建账号产生的log已经被删除了)

[root@db210_00:29:29 /data/57mysql/mysql3507/logs]  #/usr/local/mysql57/bin/mysqld --defaults-file=/data/57mysql/mysql3507/my3506.cnf&[2] 19942[root@db210_00:29:35 /data/57mysql/mysql3507/logs]  #mysql -S /tmp/mysql3507.sock -pxxxxmysql: [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 2Server version: 5.7.23-log MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. root@localhost [(none)]>show master logs; +------------------+-----------+ | Log_name | File_size | +------------------+-----------+ | mysql-bin.000010 | 268435555 | | mysql-bin.000011 | 268442595 | | mysql-bin.000012 | 268442419 | | mysql-bin.000013 | 268437857 | | mysql-bin.000014 | 268438414 | | mysql-bin.000015 | 268437131 | | mysql-bin.000016 | 268436889 | | mysql-bin.000017 | 268437011 | | mysql-bin.000018 | 268441823 | | mysql-bin.000019 | 268439288 | | mysql-bin.000020 | 258700685 | | mysql-bin.000021 | 194 | +------------------+-----------+ 12 rows in set (0.00 sec) root@localhost [(none)]>show master status; +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------------+ | mysql-bin.000021 | 194 | | | 9e912d2b-92f6-11e8-9747-0050568be82c:1-10128895, eaba29d3-94dd-11e8-91bf-0050568be82c:1-2 | +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

在临时slave(db211)上change master to 到伪master上.
gtid purged设置.9e912d2b-92f6-11e8-9747-0050568be82c:1-6730273为xtrabackup_info中备份时记录的,eaba29d3-94dd-11e8-91bf-0050568be82c:1-2为搭建伪master过程中建立账号产生的.

root@localhost [(none)]>set global gtid_purged='9e912d2b-92f6-11e8-9747-0050568be82c:1-6730273,eaba29d3-94dd-11e8-91bf-0050568be82c:1-2';    root@localhost [(none)]>start slave io_thread; root@localhost [(none)]>start slave sql_thread until sql_before_gtids='9e912d2b-92f6-11e8-9747-0050568be82c:9791090'; root@localhost [(none)]>show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: db210 Master_User: wyz Master_Port: 3507 Connect_Retry: 60 Master_Log_File: mysql-bin.000021 Read_Master_Log_Pos: 194 Relay_Log_File: relay-bin.000024 Relay_Log_Pos: 97871691 Relay_Master_Log_File: mysql-bin.000020 Slave_IO_Running: Yes Slave_SQL_Running: No 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: 97871478 Relay_Log_Space: 258702241 Until_Condition: SQL_BEFORE_GTIDS 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: NULL 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: 2103507 Master_UUID: eaba29d3-94dd-11e8-91bf-0050568be82c Master_Info_File: /data/57mysql/mysql3506/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 9e912d2b-92f6-11e8-9747-0050568be82c:6730274-10128895 Executed_Gtid_Set: 9e912d2b-92f6-11e8-9747-0050568be82c:1-9791089, eaba29d3-94dd-11e8-91bf-0050568be82c:1-2 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) ERROR: No query specified root@localhost [(none)]>select count(*) from wenyz.t2; +----------+ | count(*) | +----------+ | 163818 | +----------+ 1 row in set (0.11 sec)