做mysql的slave時間監(jiān)控，必須check_mysql文字，check當誤差：
error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory

1，錯誤信息例如以下：
[root@slave ~]# /usr/local/nagios/libexec/check_mysql -uadmin -P3306 -S /data/mbdata/open/mysql.sock -H127.0.0.1 -pxxxxx -d openshop -w 300 -c 360
/usr/local/nagios/libexec/check_mysql: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory
[root@slave ~]#

2，運行check_mysql --help看下命令，發(fā)現(xiàn)也不行。

[root@slave ~]# /usr/local/nagios/libexec/check_mysql --help /usr/local/nagios/libexec/check_mysql: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory [root@slave ~]#
3。查看一下報錯的libmysqlclient.so.18文件是否存在：
[root@db-m1-slave-1 ~]# find / -name libmysqlclient.so.18
/mysql-5.6.12/libmysql/libmysqlclient.so.18
/usr/local/mysql/lib/libmysqlclient.so.18
文件存在。可是無法識別。

4，可能是libmysqlclient的問題
搜索mysqlclient library linkage problem。

找到文章地址：http://stackoverflow.com/questions/2080679/mysqlclient-library-linkage-problem
發(fā)現(xiàn)有/etc/ld.so.conf.d/mysql-x86_64.conf這樣一個配置文件，打開看看
cat /etc/ld.so.conf.d/mysql-x86_64.conf

[root@slave ~]# cat /etc/ld.so.conf.d/mysql-x86_64.conf
/usr/lib64/mysql

進入文件夾/usr/lib64/mysql查看下有什么文件：
[root@slave ~]# ll /usr/lib64/mysql
總用量 3108
lrwxrwxrwx. 1 root root ? ? ?26 9月 ?29 2013 libmysqlclient_r.so.16 -> libmysqlclient_r.so.16.0.0
-rwxr-xr-x. 1 root root 1595176 12月 ?8 2012 libmysqlclient_r.so.16.0.0
lrwxrwxrwx. 1 root root ? ? ?24 9月 ?29 2013 libmysqlclient.so.16 -> libmysqlclient.so.16.0.0
-rwxr-xr-x. 1 root root 1582952 12月 ?8 2012 libmysqlclient.so.16.0.0
有一些軟連接。并且?guī)Я撕缶Y表示so.16之類的。可是沒有so.18之類，看來是沒有連接到這里，
可能是須要做一個軟連接把/usr/local/mysql/lib/libmysqlclient.so.18變成/usr/lib64/libmysqlclient.so.18，
立即去做軟連接：ln -s /usr/local/mysql/lib/libmysqlclient.so.18 /usr/lib64/libmysqlclient.so.18，然后再check下。check成功例如以下所看到的：

[root@slave ~]# ln -s /usr/local/mysql/lib/libmysqlclient.so.18 /usr/lib64/libmysqlclient.so.18 [root@slave ~]# [root@slave ~]# [root@slave ~]# /usr/local/nagios/libexec/check_mysql --help check_mysql v2.0 (nagios-plugins 2.0) Copyright (c) 1999-2014 Nagios Plugin Development Team<devel@nagios-plugins.org> This program tests connections to a MySQL server Usage:check_mysql [-d database] [-H host] [-P port] [-s socket][-u user] [-p password] [-S] [-l] [-a cert] [-k key][-C ca-cert] [-D ca-dir] [-L ciphers] [-f optfile] [-g group]Options:-h, --helpPrint detailed help screen-V, --versionPrint version information--extra-opts=[section][@file]Read options from an ini file. Seehttps://www.nagios-plugins.org/doc/extra-opts.htmlfor usage and examples. .................................. -l, --sslUse ssl encryptation-C, --ca-cert=STRINGPath to CA signing the cert-a, --cert=STRINGPath to SSL certificate-k, --key=STRINGPath to private SSL key-D, --ca-dir=STRINGPath to CA directory-L, --ciphers=STRINGList of valid SSL ciphers ................................................. Send email to help@nagios-plugins.org if you have questions regarding use of this software. To submit patches or suggest improvements, send email to devel@nagios-plugins.org[root@slave ~]#
5，繼續(xù)運行check_mysql來check一下
[root@slave ~]# /usr/local/nagios/libexec/check_mysql -unagios -P3306 -S -H127.0.0.1 --password='xxx@0512' /usr/local/mysql/mysql.sock -d test -w 60 -c 100
slave query error: Access denied; you need (at least one of) the SUPER, REPLICATION CLIENT privilege(s) for this operation
[root@slave ~]#?
報賬號錯誤，
check
slave query error: Access denied; you need (at least one of) the SUPER, REPLICATION CLIENT privilege(s) for this operation
賬號錯誤，進入mysql界面賦予nagios賬號權限
mysql> GRANT PROCESS, SUPER, REPLICATION CLIENT ON *.* TO nagios@'%' identified by 'xxx@0512';

6。再check
[root@slave ~]# /usr/local/nagios/libexec/check_mysql -unagios -P3306 -S -Hlocalhost --password='xxx@0512' -s /usr/local/mysql/mysql.sock -d test -w 60 -c 100
Slave IO: Yes Slave SQL: No Seconds Behind Master: (null)

mysql slave 檢測失敗。有錯誤信息：Slave IO: Yes Slave SQL: No Seconds Behind Master: (null)

進mysql窗體去看具體信息

[root@slave ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 23 Server version: 5.6.12-log Source distributionCopyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> show slave status\G *************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 10.xx.3.xxMaster_User: replMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.010294Read_Master_Log_Pos: 21764Relay_Log_File: mysql-relay-bin.003125Relay_Log_Pos: 91805Relay_Master_Log_File: mysql-bin.010275Slave_IO_Running: YesSlave_SQL_Running: NoReplicate_Do_DB: xx,xx_db,xxsystemReplicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1590Last_Error: The incident LOST_EVENTS occured on the master. Message: error writing to the binary logSkip_Counter: 0Exec_Master_Log_Pos: 91642Relay_Log_Space: 1780004Until_Condition: NoneUntil_Log_File: Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_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: NoLast_IO_Errno: 0Last_IO_Error: Last_SQL_Errno: 1590Last_SQL_Error: The incident LOST_EVENTS occured on the master. Message: error writing to the binary logReplicate_Ignore_Server_Ids: Master_Server_Id: 71Master_UUID: 9b0dcf62-29f4-11e3-9471-677b33903869Master_Info_File: mysql.slave_master_infoSQL_Delay: 0SQL_Remaining_Delay: NULLSlave_SQL_Running_State: Master_Retry_Count: 86400Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: 140512 11:29:54Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 1 row in set (0.00 sec) mysql>
關于Slave IO: Yes Slave SQL: No Seconds Behind Master: (null)，參考blog： ?http://blog.csdn.net/mchdba/article/details/25738991

7，slave重做之后，再check，slave狀態(tài)是正常的。

# /usr/local/nagios/libexec/check_mysql -unagios -P3306 -S -s /usr/local/mysql/mysql.sock -Hlocalhost --password='xxx@0512' -d test -w 60 -c 100?

[root@slave ~]# /usr/local/nagios/libexec/check_mysql -unagios -P3306 -S -s /usr/local/mysql/mysql.sock -Hlocalhost --password='xxx@0512' -d test -w 60 -c 100 Uptime: 18431321 Threads: 3 Questions: 1447646 Slow queries: 735 Opens: 18605 Flush tables: 1 Open tables: 214 Queries per second avg: 0.078 Slave IO: Yes Slave SQL: Yes Seconds Behind Master: 0|Connections=1380c;;; Open_files=32;;; Open_tables=214;;; Qcache_free_memory=66980240;;; Qcache_hits=778c;;; Qcache_inserts=5338c;;; Qcache_lowmem_prunes=0c;;; Qcache_not_cached=12516c;;; Qcache_queries_in_cache=34;;; Queries=1447647c;;; Questions=99727c;;; Table_locks_waited=0c;;; Threads_connected=1;;; Threads_running=1;;; Uptime=18431321c;;; 'seconds behind master'=0.000000s;60.000000;100.000000; [root@db-m1-slave-1 ~]#

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轉(zhuǎn)載于:https://www.cnblogs.com/yxwkf/p/4828451.html

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