The editor below will bring you an online articleMYSQL Synchronization error reporting Summary of processing methods (must read). The editor thinks it is quite good, so I will share it with you now and give it a reference.
##Preface
After a failover, a common problem is synchronization errors. When the database is very small, it is easy to handle after dumping and then importing. However, online databases are all 150G-200G, if you use this simple method, the cost is too high, so after a period of exploration, we summarized several processing methods Production environment architecture diagramThe current network. The architecture saves two copies of data and creates a high-availability cluster through asynchronous replication. When a failure occurs, the two machines are switched to the slave and become the master. The broken machine reversely synchronizes the new one. Master, when dealing with faults, the most common error is the master-slave error. The following is the error message I collected.##Common errors
##The three most common situationsThese three situations are during HA switching. Due to asynchronous replication and sync_binlog=0, a small number of The binlog has not been fully received, resulting in a synchronization error
##The first type: delete a record on the master, but cannot find it on the slave
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
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
##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
Asynchronous replicationSimply put, the master sends the binlog, regardless of whether the slave has finished receiving it, and regardless of whether it has finished executing, this action will It’s over.
Semi-synchronous replicationTo put it simply, the master sends the binlog, and the slave confirms that it has received it, but regardless of whether it has been completed, it sends a signal to the master. Received, this action is over. (Code written by Google, officially applied in 5.5.)
Disadvantages of asynchronousWhen the write operation on the master is busy, the current POS For example, the point is 10, and the IO_THREAD thread on the slave receives 3. At this time, the master is down, which will cause a difference of 7 points that is not transmitted to the slave and the data is lost.
Special circumstances
The slave's relay log relay-bin is damaged. 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
In this case, the synchronization will be delayed and the synchronization will never be completed. The above two lines of information will always appear in the error log. The solution is to change the server-id to be inconsistent.
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
Deletion failed
On the master Delete a record that cannot be found on the slave. 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
Because the master wants to delete a record, but it cannot be found on the slave, an error is reported. In this case, the master will If you delete it, the slave can skip it directly. Available commands: stop slave;
set global sql_slave_skip_counter=1;
start slave;
The record already exists on the slave, and the same record is inserted on the master.
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
Solution:
Use desc hcy.t1 on the slave; first look at the table structure: mysql> desc hcy.t1;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | NO | PRI | 0 | |
| name | char(4) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
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;
Confirm on the master and slave respectively.
Update lost
A record is updated on the master, but cannot be found on the slave, and the data is lost. 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
On the master, use mysqlbinlog to analyze what the wrong binlog log is doing. /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*/;
mysql> select * from t1 where id=2;
Empty set (0.00 sec)
mysql> select * from t1 where id=2; +----+------+ | id | name | +----+------+ | 2 | BTV | +----+------+ 1 row in set (0.00 sec)
Fill in the lost data on the slave, and then skip the error report.
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 ……
The relay log is damaged
The slave's relay log relay-bin is damaged.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
Manual repair
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: 821Slave_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
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。
[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, C<LOCK 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 C<LOCK 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 C<REPEATABLE READ> and transactions are started C<WITH 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
>
$SlaveStatusFileThe above is the detailed content of Detailed explanation of online MYSQL synchronization error handling method code summary. For more information, please follow other related articles on the PHP Chinese website!
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