nagios報警mysql出錯解決一列

    收到自己的服務器的nagios報警，內容如下：

***** Nagios *****

Notification Type: PROBLEM

Service: 06. The Mysql Status
Host: linuxjcq01
Address: 192.168.2.11
State: UNKNOWN

Date/Time: Thu Dec 22 12:11:46 CST 2011

Additional Info:

NRPE: Unable to read output

    首先，報警使用的是nrpe客戶端，測試nrpe監控命令是否正常。

vi /usr/local/nagios/etc/nrpe.cfg
......
command[check_mysql]=/usr/local/nagios/libexec/check_mysql -H 192.168.2.11 -u nagios -p 密碼 -d nagios -s /tmp/mysql.sock
......

    測試命令

/usr/local/nagios/libexec/check_mysql -H 192.168.2.11 -u nagios -p 密碼 -d nagios -s /tmp/mysql.sock
/usr/local/nagios/libexec/check_mysql: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory

    從報錯來看，原因很明顯，找不到libmysqlclient.so.18。

    原因分析：

    因爲我是自己安裝的mysql，庫文件存在於/usr/loca/mysql/lib中，查看是否存在該文件

ls -l /usr/local/mysql/lib/libmysqlclient.so.18
lrwxrwxrwx 1 mysql mysql 24 Aug 27 23:10 /usr/local/mysql/lib/libmysqlclient.so.18 -> libmysqlclient.so.18.0.0

    看來是我剛纔用yum升級軟件包的時候修改了ldconfig的配置文件，查看配置文件：

vi /etc/ld.so.conf.d/mysql-x86_64.conf
/usr/lib64/mysql

果然這個文件被重寫了，原來自己有添加/usr/local/mysql/lib

    解決方法：

    添加/usr/local/mysql/lib

vi /etc/ld.so.conf.d/mysql-x86_64.conf
/usr/lib64/mysql
/usr/local/mysql/lib

    執行ldconfig

ldconfig

    重新執行監控子命令

/usr/local/nagios/libexec/check_mysql -H 192.168.2.11 -u nagios -p 密碼 -d nagios -s /tmp/mysql.sock
Uptime: 8777  Threads: 1  Questions: 6762  Slow queries: 0  Opens: 113  Flush tables: 1  Open tables: 50  Queries per second avg: 0.770

 OK, 問題解決，一會兒收到郵件，通知服務正常了

***** Nagios *****

Notification Type: RECOVERY

Service: 06. The Mysql Status
Host: linuxjcq01
Address: 192.168.2.11
State: OK

Date/Time: Thu Dec 22 12:36:46 CST 2011

Additional Info:

Uptime: 18085  Threads: 1  Questions: 13209  Slow queries: 0  Opens: 176  Flush tables: 1  Open tables: 61  Queries per second avg: 0.730

 附上另外一個解決方法，是安裝MySQL-shared-compat包，可以到http://downloads.mysql.com/archives.php這邊，下載對應的架構和動態客戶端連接庫，安裝rpm包即可。