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    线上MYSQL同步报错故障处理方法总结(必看篇)

    前言

    在发生故障切换后,经常遇到的问题就是同步报错,数据库很小的时候,dump完再导入很简单就处理好了,但线上的数据库都150G-200G,如果用单纯的这种方法,成本太高,故经过一段时间的摸索,总结了几种处理方法。

    生产环境架构图

    目前现网的架构,保存着两份数据,通过异步复制做的高可用集群,两台机器提供对外服务。在发生故障时,切换到slave上,并将其变成master,坏掉的机器反向同步新的master,在处理故障时,遇到最多的就是主从报错。下面是我收录下来的报错信息。

    常见错误

    最常见的3种情况

    这3种情况是在HA切换时,由于是异步复制,且sync_binlog=0,会造成一小部分binlog没接收完导致同步报错。

    第一种:在master上删除一条记录,而slave上找不到。

    Last_SQL_Error: Could not execute Delete_rows event on table hcy.t1;
    Can't find record in 't1',
    Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND;
    the event's master log mysql-bin.000006, end_log_pos 254

    第二种:主键重复。在slave已经有该记录,又在master上插入了同一条记录。

    Last_SQL_Error: Could not execute Write_rows event on table hcy.t1;
    Duplicate entry '2' for key 'PRIMARY',
    Error_code: 1062;
    handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000006, end_log_pos 924

    第三种:在master上更新一条记录,而slave上找不到,丢失了数据。

    Last_SQL_Error: Could not execute Update_rows event on table hcy.t1;
    Can't find record in 't1',
    Error_code: 1032;
    handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000010, end_log_pos 263

    异步半同步区别

    异步复制
    简单的说就是master把binlog发送过去,不管slave是否接收完,也不管是否执行完,这一动作就结束了.

    半同步复制
    简单的说就是master把binlog发送过去,slave确认接收完,但不管它是否执行完,给master一个信号我这边收到了,这一动作就结束了。(谷歌写的代码,5.5上正式应用。)

    异步的劣势
    当master上写操作繁忙时,当前POS点例如是10,而slave上IO_THREAD线程接收过来的是3,此时master宕机,会造成相差7个点未传送到slave上而数据丢失。

    特殊的情况

    slave的中继日志relay-bin损坏。
    Last_SQL_Error: Error initializing relay log position: I/O error reading the header from the binary log
    Last_SQL_Error: Error initializing relay log position: Binlog has bad magic number;
    It's not a binary log file that can be used by this version of MySQL

    这种情况SLAVE在宕机,或者非法关机,例如电源故障、主板烧了等,造成中继日志损坏,同步停掉。

    人为失误需谨慎:多台slave存在重复server-id
    这种情况同步会一直延时,永远也同步不完,error错误日志里一直出现上面两行信息。解决方法就是把server-id改成不一致即可。

    Slave: received end packet from server, apparent master shutdown:
    Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000012' at postion 106

    问题处理

    删除失败

    在master上删除一条记录,而slave上找不到。

    Last_SQL_Error: Could not execute Delete_rows event on table hcy.t1;
    Can't find record in 't1',
    Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND;
    the event's master log mysql-bin.000006, end_log_pos 254

    解决方法:

    由于master要删除一条记录,而slave上找不到故报错,这种情况主上都将其删除了,那么从机可以直接跳过。可用命令:

    stop slave;
    set global sql_slave_skip_counter=1;
    start slave;

    如果这种情况很多,可用我写的一个脚本skip_error_replcation.sh,默认跳过10个错误(只针对这种情况才跳,其他情况输出错误结果,等待处理),这个脚本是参考maakit工具包的mk-slave-restart原理用shell写的,功能上定义了一些自己的东西,不是无论什么错误都一律跳过。)

    主键重复

    在slave已经有该记录,又在master上插入了同一条记录。

    Last_SQL_Error: Could not execute Write_rows event on table hcy.t1; 
    Duplicate entry '2' for key 'PRIMARY', 
    Error_code: 1062; 
    handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000006, end_log_pos 924
    
    

    解决方法:

    在slave上用desc hcy.t1; 先看下表结构:

    mysql> desc hcy.t1;
    +-------+---------+------+-----+---------+-------+
    | Field | Type  | Null | Key | Default | Extra |
    +-------+---------+------+-----+---------+-------+
    | id  | int(11) | NO  | PRI | 0    |    | 
    | name | char(4) | YES |   | NULL  |    | 
    +-------+---------+------+-----+---------+-------+
    
    

    删除重复的主键

    mysql> delete from t1 where id=2;
    Query OK, 1 row affected (0.00 sec)
    
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> show slave status\G;
    ……
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes
    ……
    mysql> select * from t1 where id=2;
    
    

    在master上和slave上再分别确认一下。

    更新丢失

    在master上更新一条记录,而slave上找不到,丢失了数据。

    Last_SQL_Error: Could not execute Update_rows event on table hcy.t1; 
    Can't find record in 't1', 
    Error_code: 1032; 
    handler error HA_ERR_KEY_NOT_FOUND; 
    the event's master log mysql-bin.000010, end_log_pos 794

    解决方法:

    在master上,用mysqlbinlog 分析下出错的binlog日志在干什么。

    /usr/local/mysql/bin/mysqlbinlog --no-defaults -v -v --base64-output=DECODE-ROWS mysql-bin.000010 | grep -A '10' 794
    
    #120302 12:08:36 server id 22 end_log_pos 794 Update_rows: table id 33 flags: STMT_END_F
    ### UPDATE hcy.t1
    ### WHERE
    ###  @1=2 /* INT meta=0 nullable=0 is_null=0 */
    ###  @2='bbc' /* STRING(4) meta=65028 nullable=1 is_null=0 */
    ### SET
    ###  @1=2 /* INT meta=0 nullable=0 is_null=0 */
    ###  @2='BTV' /* STRING(4) meta=65028 nullable=1 is_null=0 */
    # at 794
    #120302 12:08:36 server id 22 end_log_pos 821 Xid = 60
    COMMIT/*!*/;
    DELIMITER ;
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
    
    

    在slave上,查找下更新后的那条记录,应该是不存在的。

    mysql> select * from t1 where id=2;
    Empty set (0.00 sec)

    然后再到master查看

    mysql> select * from t1 where id=2;
    +----+------+
    | id | name |
    +----+------+
    | 2 | BTV | 
    +----+------+
    1 row in set (0.00 sec)
    
    

    把丢失的数据在slave上填补,然后跳过报错即可。

    mysql> insert into t1 values (2,'BTV');
    Query OK, 1 row affected (0.00 sec)
    
    mysql> select * from t1 where id=2;  
    +----+------+
    | id | name |
    +----+------+
    | 2 | BTV | 
    +----+------+
    1 row in set (0.00 sec)
    
    mysql> stop slave ;set global sql_slave_skip_counter=1;start slave;
    Query OK, 0 rows affected (0.01 sec)
    Query OK, 0 rows affected (0.00 sec)
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> show slave status\G;
    ……
     Slave_IO_Running: Yes
     Slave_SQL_Running: Yes
    ……
    
    

    中继日志损坏

    slave的中继日志relay-bin损坏。

    Last_SQL_Error: Error initializing relay log position: I/O error reading the header from the binary log
    Last_SQL_Error: Error initializing relay log position: Binlog has bad magic number; 
    It's not a binary log file that can be used by this version of MySQL
    
    

    手工修复

    解决方法:找到同步的binlog和POS点,然后重新做同步,这样就可以有新的中继日值了。

    例子:

    mysql> show slave status\G;
    *************************** 1. row ***************************
           Master_Log_File: mysql-bin.000010
         Read_Master_Log_Pos: 1191
            Relay_Log_File: vm02-relay-bin.000005
            Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000010
           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: 1593
              Last_Error: Error initializing relay log position: I/O error reading the header from the binary log
             Skip_Counter: 1
         Exec_Master_Log_Pos: 821
    
    

    Slave_IO_Running :接收master的binlog信息       

    Master_Log_File
                       Read_Master_Log_Pos

    Slave_SQL_Running:执行写操作

                       Relay_Master_Log_File
                       Exec_Master_Log_Pos

    以执行写的binlog和POS点为准。

    Relay_Master_Log_File: mysql-bin.000010
    Exec_Master_Log_Pos: 821
    mysql> stop slave;
    Query OK, 0 rows affected (0.01 sec)
    
    mysql> CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000010',MASTER_LOG_POS=821;
    Query OK, 0 rows affected (0.01 sec)
    
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)
    
    
    mysql> show slave status\G;
    *************************** 1. row ***************************
            Slave_IO_State: Waiting for master to send event
             Master_Host: 192.168.8.22
             Master_User: repl
             Master_Port: 3306
            Connect_Retry: 10
           Master_Log_File: mysql-bin.000010
         Read_Master_Log_Pos: 1191
            Relay_Log_File: vm02-relay-bin.000002
            Relay_Log_Pos: 623
        Relay_Master_Log_File: mysql-bin.000010
           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: 1191
           Relay_Log_Space: 778
           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: 
    Ibbackup
    
    

    各种大招都用上了,无奈slave数据丢失过多,ibbackup(需要银子)该你登场了。

    Ibbackup热备份工具,是付费的。xtrabackup是免费的,功能上一样。

    Ibbackup备份期间不锁表,备份时开启一个事务(相当于做一个快照),然后会记录一个点,之后数据的更改保存在ibbackup_logfile文件里,恢复时把ibbackup_logfile 变化的数据再写入到ibdata里。

    Ibbackup 只备份数据( ibdata、.ibd ),表结构.frm不备份。

    下面一个演示例子:

    备份:ibbackup /bak/etc/my_local.cnf /bak/etc/my_bak.cnf

    恢复:ibbackup --apply-log /bak/etc/my_bak.cnf

    [root@vm01 etc]# more my_local.cnf 
    
    datadir =/usr/local/mysql/data
    innodb_data_home_dir = /usr/local/mysql/data
    innodb_data_file_path = ibdata1:10M:autoextend
    innodb_log_group_home_dir = /usr/local/mysql/data
    innodb_buffer_pool_size = 100M
    innodb_log_file_size = 5M
    innodb_log_files_in_group=2
    
    
    [root@vm01 etc]# ibbackup /bak/etc/my_local.cnf /bak/etc/my_bak.cnf 
    
    InnoDB Hot Backup version 3.0.0; Copyright 2002-2005 Innobase Oy
    License A21488 is granted to vm01 (chunyang_he@126.com)
    (--apply-log works in any computer regardless of the hostname)
    Licensed for use in a computer whose hostname is 'vm01'
    Expires 2012-5-1 (year-month-day) at 00:00
    See http://www.innodb.com for further information
    Type ibbackup --license for detailed license terms, --help for help
    
    Contents of /bak/etc/my_local.cnf:
    innodb_data_home_dir got value /usr/local/mysql/data
    innodb_data_file_path got value ibdata1:10M:autoextend
    datadir got value /usr/local/mysql/data
    innodb_log_group_home_dir got value /usr/local/mysql/data
    innodb_log_files_in_group got value 2
    innodb_log_file_size got value 5242880
    
    Contents of /bak/etc/my_bak.cnf:
    innodb_data_home_dir got value /bak/data
    innodb_data_file_path got value ibdata1:10M:autoextend
    
    datadir got value /bak/data
    innodb_log_group_home_dir got value /bak/data
    innodb_log_files_in_group got value 2
    innodb_log_file_size got value 5242880
    
    ibbackup: Found checkpoint at lsn 0 1636898
    ibbackup: Starting log scan from lsn 0 1636864
    120302 16:47:43 ibbackup: Copying log...
    120302 16:47:43 ibbackup: Log copied, lsn 0 1636898
    ibbackup: We wait 1 second before starting copying the data files...
    120302 16:47:44 ibbackup: Copying /usr/local/mysql/data/ibdata1
    ibbackup: A copied database page was modified at 0 1636898
    ibbackup: Scanned log up to lsn 0 1636898
    ibbackup: Was able to parse the log up to lsn 0 1636898
    ibbackup: Maximum page number for a log record 0
    120302 16:47:46 ibbackup: Full backup completed!
    [root@vm01 etc]#
    [root@vm01 etc]# cd /bak/data/
    [root@vm01 data]# ls
    ibbackup_logfile ibdata1
    
    [root@vm01 data]# ibbackup --apply-log /bak/etc/my_bak.cnf 
    
    InnoDB Hot Backup version 3.0.0; Copyright 2002-2005 Innobase Oy
    License A21488 is granted to vm01 (chunyang_he@126.com)
    (--apply-log works in any computer regardless of the hostname)
    Licensed for use in a computer whose hostname is 'vm01'
    Expires 2012-5-1 (year-month-day) at 00:00
    See http://www.innodb.com for further information
    Type ibbackup --license for detailed license terms, --help for help
    
    Contents of /bak/etc/my_bak.cnf:
    innodb_data_home_dir got value /bak/data
    innodb_data_file_path got value ibdata1:10M:autoextend
    datadir got value /bak/data
    innodb_log_group_home_dir got value /bak/data
    innodb_log_files_in_group got value 2
    innodb_log_file_size got value 5242880
    
    120302 16:48:38 ibbackup: ibbackup_logfile's creation parameters:
    ibbackup: start lsn 0 1636864, end lsn 0 1636898,
    ibbackup: start checkpoint 0 1636898
    
    
    ibbackup: start checkpoint 0 1636898
    InnoDB: Doing recovery: scanned up to log sequence number 0 1636898
    InnoDB: Starting an apply batch of log records to the database...
    InnoDB: Progress in percents: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 .....99
    Setting log file size to 0 5242880
    ibbackup: We were able to parse ibbackup_logfile up to
    ibbackup: lsn 0 1636898
    ibbackup: Last MySQL binlog file position 0 1191, file name ./mysql-bin.000010
    ibbackup: The first data file is '/bak/data/ibdata1'
    ibbackup: and the new created log files are at '/bak/data/'
    120302 16:48:38 ibbackup: Full backup prepared for recovery successfully!
    
    [root@vm01 data]# ls
    ibbackup_logfile ibdata1 ib_logfile0 ib_logfile1
    
    

    把ibdata1 ib_logfile0 ib_logfile1拷贝到从,把.frm也拷贝过去,启动MySQL后,做同步,那个点就是上面输出的:

    ibbackup: Last MySQL binlog file position 0 1191, file name ./mysql-bin.000010
    CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000010',MASTER_LOG_POS=1191;

    Maatkit工具包
    http://www.maatkit.org/

    简介

    maatkit是一个开源的工具包,为mysql日常管理提供了帮助。目前,已被Percona公司收购并维护。其中:

    mk-table-checksum是用来检测master和slave上的表结构和数据是否一致。

    mk-table-sync是发生主从数据不一致时,来修复的。

    这两个工具包,没有在现网实际操作的经验,这里仅仅是新技术探讨和学术交流,下面展示下如何使用。

    http://www.actionsky.com/products/mysql-others/maatkit.jsp

    [root@vm02]# mk-table-checksum h=vm01,u=admin,p=123456 h=vm02,u=admin,p=123456 -d hcy -t t1
    Cannot connect to MySQL because the Perl DBI module is not installed or not found. 
    Run 'perl -MDBI' to see the directories that Perl searches for DBI.
    If DBI is not installed, try:
     Debian/Ubuntu apt-get install libdbi-perl
     RHEL/CentOS  yum install perl-DBI
     OpenSolaris  pgk install pkg:/SUNWpmdbi
    
    

    提示缺少perl-DBI模块,那么直接 yum install perl-DBI。

    [root@vm02 bin]# mk-table-checksum h=vm01,u=admin,p=123456 h=vm02,u=admin,p=123456 -d hcy -t t1
    DATABASE TABLE CHUNK HOST ENGINE   COUNT     CHECKSUM TIME WAIT STAT LAG
    hcy   t1    0 vm02 InnoDB    NULL    1957752020  0  0 NULL NULL
    hcy   t1    0 vm01 InnoDB    NULL    1957752020  0  0 NULL NULL

    如果表数据不一致,CHECKSUM的值是不相等的。

    解释下输出的意思:

    DATABASE:数据库名
    TABLE:表名
    CHUNK:checksum时的近似数值
    HOST:MYSQL的地址
    ENGINE:表引擎
    COUNT:表的行数
    CHECKSUM:校验值
    TIME:所用时间
    WAIT:等待时间
    STAT:MASTER_POS_WAIT()返回值
    LAG:slave的延时时间

    如果你想过滤出不相等的都有哪些表,可以用mk-checksum-filter这个工具,只要在后面加个管道符就行了。

    [root@vm02 ~]# mk-table-checksum h=vm01,u=admin,p=123456 h=vm02,u=admin,p=123456 -d hcy | mk-checksum-filter    
    hcy   t2    0 vm01 InnoDB    NULL    1957752020  0  0 NULL NULL
    hcy   t2    0 vm02 InnoDB    NULL    1068689114  0  0 NULL NULL

    知道有哪些表不一致,可以用mk-table-sync这个工具来处理。

    注:在执行mk-table-checksum时会锁表,表的大小取决于执行的快慢。

    MASTER上的t2表数据:

    SLAVE上的t2表数据:

    mysql> select * from t2;         mysql> select * from t2;  
    +----+------+               +----+------+
    | id | name |               | id | name |
    +----+------+               +----+------+
    | 1 | a  |               | 1 | a  | 
    | 2 | b  |               | 2 | b  | 
    | 3 | ss  |               | 3 | ss  | 
    | 4 | asd |               | 4 | asd | 
    | 5 | ss  |               +----+------+
    +----+------+               4 rows in set (0.00 sec)
    5 rows in set (0.00 sec) 
                         mysql> \!! hostname; 
    mysql> \!! hostname;            vm02    
    vm01 
    [root@vm02 ~]# mk-table-sync --execute --print --no-check-slave --transaction --databases hcy h=vm01,u=admin,p=123456 h=vm02,u=admin,p=123456 
    INSERT INTO `hcy`.`t2`(`id`, `name`) VALUES ('5', 'ss') /*maatkit src_db:hcy src_tbl:t2 src_dsn:h=vm01,p=...,u=admin dst_db:hcy dst_tbl:t2 
    dst_dsn:h=vm02,p=...,u=admin lock:0 transaction:1 changing_src:0 replicate:0 bidirectional:0 pid:3246 user:root host:vm02*/;
    
    

    它的工作原理是:先一行一行检查主从库的表是否一样,如果哪里不一样,就执行删除,更新,插入等操作,使其达到一致。表的大小决定着执行的快慢。

    If C--transaction> is specified, CLOCK TABLES> is not used. Instead, lock
    and unlock are implemented by beginning and committing transactions.
    The exception is if L"--lock"> is 3.
    If C--no-transaction> is specified, then CLOCK TABLES> is used for any
    value of L"--lock">. See L"--[no]transaction">.
    When enabled, either explicitly or implicitly, the transaction isolation level
    is set CREPEATABLE READ> and transactions are started CWITH CONSISTENT
    SNAPSHOT>
    

    MySQL复制监控

    MySQL常见错误类型

    1005:创建表失败
    1006:创建数据库失败
    1007:数据库已存在,创建数据库失败
    1008:数据库不存在,删除数据库失败
    1009:不能删除数据库文件导致删除数据库失败
    1010:不能删除数据目录导致删除数据库失败
    1011:删除数据库文件失败
    1012:不能读取系统表中的记录
    1020:记录已被其他用户修改
    1021:硬盘剩余空间不足,请加大硬盘可用空间
    1022:关键字重复,更改记录失败
    1023:关闭时发生错误
    1024:读文件错误
    1025:更改名字时发生错误
    1026:写文件错误
    1032:记录不存在
    1036:数据表是只读的,不能对它进行修改
    1037:系统内存不足,请重启数据库或重启服务器
    1038:用于排序的内存不足,请增大排序缓冲区
    1040:已到达数据库的最大连接数,请加大数据库可用连接数
    1041:系统内存不足
    1042:无效的主机名
    1043:无效连接
    1044:当前用户没有访问数据库的权限
    1045:不能连接数据库,用户名或密码错误
    1048:字段不能为空
    1049:数据库不存在
    1050:数据表已存在
    1051:数据表不存在
    1054:字段不存在
    1065:无效的SQL语句,SQL语句为空
    1081:不能建立Socket连接
    1114:数据表已满,不能容纳任何记录
    1116:打开的数据表太多
    1129:数据库出现异常,请重启数据库
    1130:连接数据库失败,没有连接数据库的权限
    1133:数据库用户不存在
    1141:当前用户无权访问数据库
    1142:当前用户无权访问数据表
    1143:当前用户无权访问数据表中的字段
    1146:数据表不存在
    1147:未定义用户对数据表的访问权限
    1149:SQL语句语法错误
    1158:网络错误,出现读错误,请检查网络连接状况
    1159:网络错误,读超时,请检查网络连接状况
    1160:网络错误,出现写错误,请检查网络连接状况
    1161:网络错误,写超时,请检查网络连接状况
    1062:字段值重复,入库失败
    1169:字段值重复,更新记录失败
    1177:打开数据表失败
    1180:提交事务失败
    1181:回滚事务失败
    1203:当前用户和数据库建立的连接已到达数据库的最大连接数,请增大可用的数据库连接数或重启数据库
    1205:加锁超时
    1211:当前用户没有创建用户的权限
    1216:外键约束检查失败,更新子表记录失败
    1217:外键约束检查失败,删除或修改主表记录失败
    1226:当前用户使用的资源已超过所允许的资源,请重启数据库或重启服务器
    1227:权限不足,您无权进行此操作
    1235:MySQL版本过低,不具有本功能

    复制监控脚本

    参考原文修改。

    原脚本

    #!/bin/bash
    #
    #check_mysql_slave_replication_status
    #
    #
    #
    parasum=2
    help_msg(){
     
    cat 
     help
    +---------------------+
    +Error
     Cause:
    +you
     must input $parasum parameters!
    +1st
     : Host_IP
    +2st
     : Host_Port
    help
    exit
    }
     
    [
     $#
     -ne ${parasum} ]  help_msg #若参数不够打印帮助信息并退出
     
    export HOST_IP=$1
    export HOST_PORt=$2
    MYUSER="root"     
    MYPASS="123456"
     
    MYSQL_CMD="mysql
     -u$MYUSER -p$MYPASS"
    MailTitle=""        #邮件主题
    Mail_Address_MysqlStatus="root@localhost.localdomain"  #收件人邮箱  
     
    time1=$(date +"%Y%m%d%H%M%S")
    time2=$(date +"%Y-%m-%d
     %H:%M:%S")
     
    SlaveStatusFile=/tmp/salve_status_${HOST_PORT}.${time1} 
    #邮件内容所在文件
    echo "--------------------Begin
     at: "$time2
     > $SlaveStatusFile
    echo "" >>
     $SlaveStatusFile
     
    #get
     slave status
    ${MYSQL_CMD}
     -e "show
     slave status\G" >>
     $SlaveStatusFile #取得salve进程的状态
     
    #get
     io_thread_status,sql_thread_status,last_errno  取得以下状态值
     
    IOStatus=$(cat $SlaveStatusFile|grep Slave_IO_Running|awk '{print
     $2}')
    SQLStatus=$(cat $SlaveStatusFile|grep Slave_SQL_Running
     |awk '{print
     $2}')
      Errno=$(cat $SlaveStatusFile|grep Last_Errno
     | awk '{print
     $2}')
      Behind=$(cat $SlaveStatusFile|grep Seconds_Behind_Master
     | awk '{print
     $2}')
     
    echo "" >>
     $SlaveStatusFile
     
    if [
    "$IOStatus" ==
    "No" ]
     || [ "$SQLStatus" ==
    "No" ];then  #判断错误类型
        if [
    "$Errno" -eq 0
     ];then  #可能是salve线程未启动
          $MYSQL_CMD
     -e "start
     slave io_thread;start slave sql_thread;"
          echo "Cause
     slave threads doesnot's running,trying start slsave io_thread;start slave sql_thread;" >>
     $SlaveStatusFile
          MailTitle="[Warning]
     Slave threads stoped on $HOST_IP $HOST_PORT"
        elif [
    "$Errno" -eq 1007
     ] || [ "$Errno" -eq 1053
     ] || [ "$Errno" -eq 1062
     ] || [ "$Errno" -eq 1213
     ] || [ "$Errno" -eq 1032
     ]\
    
          ||
     [ "Errno" -eq 1158
     ] || [ "$Errno" -eq 1159
     ] || [ "$Errno" -eq 1008
     ];then #忽略此些错误
          $MYSQL_CMD
     -e "stop
     slave;set global sql_slave_skip_counter=1;start slave;"
          echo "Cause
     slave replication catch errors,trying skip counter and restart slave;stop slave ;set global sql_slave_skip_counter=1;slave start;" >>
     $SlaveStatusFile
          MailTitle="[Warning]
     Slave error on $HOST_IP $HOST_PORT! ErrNum: $Errno"
        else
          echo "Slave
     $HOST_IP $HOST_PORT is down!" >>
     $SlaveStatusFile
          MailTitle="[ERROR]Slave
     replication is down on $HOST_IP $HOST_PORT ! ErrNum:$Errno"
        fi
    fi
    if [
     -n "$Behind" ];then
        Behind=0
    fi
    echo "$Behind" >>
     $SlaveStatusFile
     
    #delay
     behind master 判断延时时间
    if [
     $Behind -gt 300 ];then
      echo `date +"%Y-%m%d
     %H:%M:%S"`
    "slave
     is behind master $Bebind seconds!" >>
     $SlaveStatusFile
      MailTitle="[Warning]Slave
     delay $Behind seconds,from $HOST_IP $HOST_PORT"
    fi
     
    if [
     -n "$MailTitle" ];then #若出错或者延时时间大于300s则发送邮件
        cat ${SlaveStatusFile}
     | /bin/mail -s
    "$MailTitle" $Mail_Address_MysqlStatus
    fi
     
    #del
     tmpfile:SlaveStatusFile
    >
     $SlaveStatusFile

    修改后脚本

    只做了简单的整理,修正了Behind为NULL的判断,但均未测试;

    应可考虑增加:

    对修复执行结果的判断;多条错误的循环修复、检测、再修复?

    取消SlaveStatusFile临时文件。

    Errno、Behind两种告警分别发邮件,告警正文增加show slave结果原文。

    增加PATH,以便加到crontab中。

    考虑crontab中周期执行(加锁避免执行冲突、执行周期选择)

    增加执行日志?

    #!/bin/sh
    #
     check_mysql_slave_replication_status
    #
     参考:http://www.tianfeiyu.com/?p=2062
     
    Usage(){
      echo Usage:
      echo "$0
     HOST PORT USER PASS"
    }
     
    [
     -z "$1" -o
     -z "$2" -o
     -z "$3" -o
     -z "$4" ]
      Usage  exit 1
    HOST=$1
    PORT=$2
    USER=$3
    PASS=$4
     
    MYSQL_CMD="mysql
     -h$HOST -P$PORT -u$USER -p$PASS"
     
    MailTitle=""        #邮件主题
    Mail_Address_MysqlStatus="root@localhost.localdomain"  #收件人邮箱  
     
    time1=$(date +"%Y%m%d%H%M%S")
    time2=$(date +"%Y-%m-%d
     %H:%M:%S")
     
    SlaveStatusFile=/tmp/salve_status_${HOST_PORT}.${time1} 
    #邮件内容所在文件
    echo "--------------------Begin
     at: "$time2
     > $SlaveStatusFile
    echo "" >>
     $SlaveStatusFile
     
    #get
     slave status
    ${MYSQL_CMD}
     -e "show
     slave status\G" >>
     $SlaveStatusFile #取得salve进程的状态
     
    #get
     io_thread_status,sql_thread_status,last_errno  取得以下状态值
     
     IOStatus=$(cat $SlaveStatusFile|grep Slave_IO_Running|awk '{print
     $2}')
    SQLStatus=$(cat $SlaveStatusFile|grep Slave_SQL_Running
     |awk '{print
     $2}')
      Errno=$(cat $SlaveStatusFile|grep Last_Errno
     | awk '{print
     $2}')
      Behind=$(cat $SlaveStatusFile|grep Seconds_Behind_Master
     | awk '{print
     $2}')
     
    echo "" >>
     $SlaveStatusFile
     
    if [
    "$IOStatus" =
    "No" -o
    "$SQLStatus" =
    "No" ];then
      case "$Errno" in
      0)
        #
     可能是slave未启动
        $MYSQL_CMD
     -e "start
     slave io_thread;start slave sql_thread;"
        echo "Cause
     slave threads doesnot's running,trying start slsave io_thread;start slave sql_thread;" >>
     $SlaveStatusFile
        ;;
      1007|1053|1062|1213|1032|1158|1159|1008)
        #
     忽略这些错误
        $MYSQL_CMD
     -e "stop
     slave;set global sql_slave_skip_counter=1;start slave;"
        echo "Cause
     slave replication catch errors,trying skip counter and restart slave;stop slave ;set global sql_slave_skip_counter=1;slave start;" >>
     $SlaveStatusFile
        MailTitle="[Warning]
     Slave error on $HOST:$PORT! ErrNum: $Errno"
        ;;
      *)
        echo "Slave
     $HOST:$PORT is down!" >>
     $SlaveStatusFile
        MailTitle="[ERROR]Slave
     replication is down on $HOST:$PORT! Errno:$Errno"
        ;;
      esac
    fi
     
    if [
    "$Behind" =
    "NULL" -o
     -z "$Behind" ];then
      Behind=0
    fi
    echo "Behind:$Behind" >>
     $SlaveStatusFile
     
    #delay
     behind master 判断延时时间
    if [
     $Behind -gt 300 ];then
      echo `date +"%Y-%m%d
     %H:%M:%S"`
    "slave
     is behind master $Bebind seconds!" >>
     $SlaveStatusFile
      MailTitle="[Warning]Slave
     delay $Behind seconds,from $HOST $PORT"
    fi
     
    if [
     -n "$MailTitle" ];then #若出错或者延时时间大于300s则发送邮件
      cat ${SlaveStatusFile}
     | /bin/mail -s
    "$MailTitle" $Mail_Address_MysqlStatus
    fi
     
    #del
     tmpfile:SlaveStatusFile
    >
     $SlaveStatusFile

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