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 程式師世界 >> 數據庫知識 >> MYSQL數據庫 >> 關於MYSQL數據庫 >> 線上MYSQL同步報錯故障處理方法總結(必看篇)

線上MYSQL同步報錯故障處理方法總結(必看篇)

編輯:關於MYSQL數據庫

前言

在發生故障切換後,經常遇到的問題就是同步報錯,數據庫很小的時候,dump完再導入很簡單就處理好了,但線上的數據庫都150G-200G,如果用單純的這種方法,成本太高,故經過一段時間的摸索,總結了幾種處理方法。

生產環境架構圖

目前現網的架構,保存著兩份數據,通過異步復制做的高可用集群,兩台機器提供對外服務。在發生故障時,切換到slave上,並將其變成master,壞掉的機器反向同步新的master,在處理故障時,遇到最多的就是主從報錯。下面是我收錄下來的報錯信息。

常見錯誤

最常見的3種情況

這3種情況是在HA切換時,由於是異步復制,且sync_binlog=0,會造成一小部分binlog沒接收完導致同步報錯。

第一種:在master上刪除一條記錄,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

第二種:主鍵重復。在slave已經有該記錄,又在master上插入了同一條記錄。

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

第三種:在master上更新一條記錄,而slave上找不到,丟失了數據。

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

異步半同步區別

異步復制
簡單的說就是master把binlog發送過去,不管slave是否接收完,也不管是否執行完,這一動作就結束了.

半同步復制
簡單的說就是master把binlog發送過去,slave確認接收完,但不管它是否執行完,給master一個信號我這邊收到了,這一動作就結束了。(谷歌寫的代碼,5.5上正式應用。)

異步的劣勢
當master上寫操作繁忙時,當前POS點例如是10,而slave上IO_THREAD線程接收過來的是3,此時master宕機,會造成相差7個點未傳送到slave上而數據丟失。

特殊的情況

slave的中繼日志relay-bin損壞。
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

這種情況SLAVE在宕機,或者非法關機,例如電源故障、主板燒了等,造成中繼日志損壞,同步停掉。

人為失誤需謹慎:多台slave存在重復server-id
這種情況同步會一直延時,永遠也同步不完,error錯誤日志裡一直出現上面兩行信息。解決方法就是把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

問題處理

刪除失敗

在master上刪除一條記錄,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

解決方法:

由於master要刪除一條記錄,而slave上找不到故報錯,這種情況主上都將其刪除了,那麼從機可以直接跳過。可用命令:

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

如果這種情況很多,可用我寫的一個腳本skip_error_replcation.sh,默認跳過10個錯誤(只針對這種情況才跳,其他情況輸出錯誤結果,等待處理),這個腳本是參考maakit工具包的mk-slave-restart原理用shell寫的,功能上定義了一些自己的東西,不是無論什麼錯誤都一律跳過。)

主鍵重復

在slave已經有該記錄,又在master上插入了同一條記錄。

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

解決方法:

在slave上用desc hcy.t1; 先看下表結構:

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

刪除重復的主鍵

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上再分別確認一下。

更新丟失

在master上更新一條記錄,而slave上找不到,丟失了數據。

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

解決方法:

在master上,用mysqlbinlog 分析下出錯的binlog日志在干什麼。

/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,查找下更新後的那條記錄,應該是不存在的。

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

然後再到master查看

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

把丟失的數據在slave上填補,然後跳過報錯即可。

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
……

中繼日志損壞

slave的中繼日志relay-bin損壞。

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

手工修復

解決方法:找到同步的binlog和POS點,然後重新做同步,這樣就可以有新的中繼日值了。

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:執行寫操作

                   Relay_Master_Log_File
                   Exec_Master_Log_Pos

以執行寫的binlog和POS點為准。

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

各種大招都用上了,無奈slave數據丟失過多,ibbackup(需要銀子)該你登場了。

Ibbackup熱備份工具,是付費的。xtrabackup是免費的,功能上一樣。

Ibbackup備份期間不鎖表,備份時開啟一個事務(相當於做一個快照),然後會記錄一個點,之後數據的更改保存在ibbackup_logfile文件裡,恢復時把ibbackup_logfile 變化的數據再寫入到ibdata裡。

Ibbackup 只備份數據( ibdata、.ibd ),表結構.frm不備份。

下面一個演示例子:

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

恢復: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 ([email protected])
(--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 ([email protected])
(--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拷貝到從,把.frm也拷貝過去,啟動MySQL後,做同步,那個點就是上面輸出的:

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/

簡介

maatkit是一個開源的工具包,為mysql日常管理提供了幫助。目前,已被Percona公司收購並維護。其中:

mk-table-checksum是用來檢測master和slave上的表結構和數據是否一致。

mk-table-sync是發生主從數據不一致時,來修復的。

這兩個工具包,沒有在現網實際操作的經驗,這裡僅僅是新技術探討和學術交流,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模塊,那麼直接 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

如果表數據不一致,CHECKSUM的值是不相等的。

解釋下輸出的意思:

DATABASE:數據庫名
TABLE:表名
CHUNK:checksum時的近似數值
HOST:MYSQL的地址
ENGINE:表引擎
COUNT:表的行數
CHECKSUM:校驗值
TIME:所用時間
WAIT:等待時間
STAT:MASTER_POS_WAIT()返回值
LAG:slave的延時時間

如果你想過濾出不相等的都有哪些表,可以用mk-checksum-filter這個工具,只要在後面加個管道符就行了。

[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這個工具來處理。

注:在執行mk-table-checksum時會鎖表,表的大小取決於執行的快慢。

MASTER上的t2表數據:

SLAVE上的t2表數據:

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:先一行一行檢查主從庫的表是否一樣,如果哪裡不一樣,就執行刪除,更新,插入等操作,使其達到一致。表的大小決定著執行的快慢。

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復制監控

MySQL常見錯誤類型

1005:創建表失敗
1006:創建數據庫失敗
1007:數據庫已存在,創建數據庫失敗
1008:數據庫不存在,刪除數據庫失敗
1009:不能刪除數據庫文件導致刪除數據庫失敗
1010:不能刪除數據目錄導致刪除數據庫失敗
1011:刪除數據庫文件失敗
1012:不能讀取系統表中的記錄
1020:記錄已被其他用戶修改
1021:硬盤剩余空間不足,請加大硬盤可用空間
1022:關鍵字重復,更改記錄失敗
1023:關閉時發生錯誤
1024:讀文件錯誤
1025:更改名字時發生錯誤
1026:寫文件錯誤
1032:記錄不存在
1036:數據表是只讀的,不能對它進行修改
1037:系統內存不足,請重啟數據庫或重啟服務器
1038:用於排序的內存不足,請增大排序緩沖區
1040:已到達數據庫的最大連接數,請加大數據庫可用連接數
1041:系統內存不足
1042:無效的主機名
1043:無效連接
1044:當前用戶沒有訪問數據庫的權限
1045:不能連接數據庫,用戶名或密碼錯誤
1048:字段不能為空
1049:數據庫不存在
1050:數據表已存在
1051:數據表不存在
1054:字段不存在
1065:無效的SQL語句,SQL語句為空
1081:不能建立Socket連接
1114:數據表已滿,不能容納任何記錄
1116:打開的數據表太多
1129:數據庫出現異常,請重啟數據庫
1130:連接數據庫失敗,沒有連接數據庫的權限
1133:數據庫用戶不存在
1141:當前用戶無權訪問數據庫
1142:當前用戶無權訪問數據表
1143:當前用戶無權訪問數據表中的字段
1146:數據表不存在
1147:未定義用戶對數據表的訪問權限
1149:SQL語句語法錯誤
1158:網絡錯誤,出現讀錯誤,請檢查網絡連接狀況
1159:網絡錯誤,讀超時,請檢查網絡連接狀況
1160:網絡錯誤,出現寫錯誤,請檢查網絡連接狀況
1161:網絡錯誤,寫超時,請檢查網絡連接狀況
1062:字段值重復,入庫失敗
1169:字段值重復,更新記錄失敗
1177:打開數據表失敗
1180:提交事務失敗
1181:回滾事務失敗
1203:當前用戶和數據庫建立的連接已到達數據庫的最大連接數,請增大可用的數據庫連接數或重啟數據庫
1205:加鎖超時
1211:當前用戶沒有創建用戶的權限
1216:外鍵約束檢查失敗,更新子表記錄失敗
1217:外鍵約束檢查失敗,刪除或修改主表記錄失敗
1226:當前用戶使用的資源已超過所允許的資源,請重啟數據庫或重啟服務器
1227:權限不足,您無權進行此操作
1235:MySQL版本過低,不具有本功能

復制監控腳本

參考原文修改。

原腳本

#!/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 #若參數不夠打印幫助信息並退出
 
export HOST_IP=$1
export HOST_PORt=$2
MYUSER="root"     
MYPASS="123456"
 
MYSQL_CMD="mysql
 -u$MYUSER -p$MYPASS"
MailTitle=""        #郵件主題
Mail_Address_MysqlStatus="[email protected]"  #收件人郵箱  
 
time1=$(date +"%Y%m%d%H%M%S")
time2=$(date +"%Y-%m-%d
 %H:%M:%S")
 
SlaveStatusFile=/tmp/salve_status_${HOST_PORT}.${time1} 
#郵件內容所在文件
echo "--------------------Begin
 at: "$time2
 > $SlaveStatusFile
echo "" >>
 $SlaveStatusFile
 
#get
 slave status
${MYSQL_CMD}
 -e "show
 slave status\G" >>
 $SlaveStatusFile #取得salve進程的狀態
 
#get
 io_thread_status,sql_thread_status,last_errno  取得以下狀態值
 
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  #判斷錯誤類型
    if [
"$Errno" -eq 0
 ];then  #可能是salve線程未啟動
      $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 #忽略此些錯誤
      $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 判斷延時時間
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 #若出錯或者延時時間大於300s則發送郵件
    cat ${SlaveStatusFile}
 | /bin/mail -s
"$MailTitle" $Mail_Address_MysqlStatus
fi
 
#del
 tmpfile:SlaveStatusFile
>
 $SlaveStatusFile

修改後腳本

只做了簡單的整理,修正了Behind為NULL的判斷,但均未測試;

應可考慮增加:

對修復執行結果的判斷;多條錯誤的循環修復、檢測、再修復?

取消SlaveStatusFile臨時文件。

Errno、Behind兩種告警分別發郵件,告警正文增加show slave結果原文。

增加PATH,以便加到crontab中。

考慮crontab中周期執行(加鎖避免執行沖突、執行周期選擇)

增加執行日志?

#!/bin/sh
#
 check_mysql_slave_replication_status
#
 參考: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=""        #郵件主題
Mail_Address_MysqlStatus="[email protected]"  #收件人郵箱  
 
time1=$(date +"%Y%m%d%H%M%S")
time2=$(date +"%Y-%m-%d
 %H:%M:%S")
 
SlaveStatusFile=/tmp/salve_status_${HOST_PORT}.${time1} 
#郵件內容所在文件
echo "--------------------Begin
 at: "$time2
 > $SlaveStatusFile
echo "" >>
 $SlaveStatusFile
 
#get
 slave status
${MYSQL_CMD}
 -e "show
 slave status\G" >>
 $SlaveStatusFile #取得salve進程的狀態
 
#get
 io_thread_status,sql_thread_status,last_errno  取得以下狀態值
 
 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未啟動
    $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)
    #
 忽略這些錯誤
    $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 判斷延時時間
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 #若出錯或者延時時間大於300s則發送郵件
  cat ${SlaveStatusFile}
 | /bin/mail -s
"$MailTitle" $Mail_Address_MysqlStatus
fi
 
#del
 tmpfile:SlaveStatusFile
>
 $SlaveStatusFile

以上這篇線上MYSQL同步報錯故障處理方法總結(必看篇)就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支持。

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