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PING     UNKNOWN /bin/ping -n -U -w 10 -c 5 xx.xx.xx.xx Nagios monitoring page showing above error when configuring in the client host ? 'Set-user-ID-on-execution permission' to fix the issue, # ls -al /bin/ping -rwxr-xr-x. 1 root root 40760 xxx xx  xxxx /bin/ping # chmod u+s /bin/ping  // fix the issue. # ls -la /bin/ping -rwsr-xr-x. 1 root root 40760 xxx xx  xxxx /bin/ping

To fix "check_nrpe: No such file or directory" # cd # wget http://prdownloads. sourceforge.net/sourceforge/ nagios/nrpe-2.13.tar.gz # tar zxvf nrpe*.tar.gz # cd nrpe* # ./configure --with-nagios-user=nagios --with-nagios-group=nagios # cd ./src/ # make check_nrpe # mv ./check_nrpe /usr/local/nagios/libexec/ Now you can find: /usr/local/nagios/libexec/check_nrpe !!!

How to stop logging query cache denied to /var/log/message and /var/named/data/named.run ? Solved: Adding the following to your /etc/named.conf will stop logging the cache denied messages: category security { null; }; So named.conf will looking like below: ------------------------------------------- logging {     category security { null; };     channel default_debug {             file "data/named.run";             severity dynamic;     }; }; --------------------------------------------

Yes, We can execute shell commands over mysql environment without exit by adding "\! " before commands as like "\! command", mysql> \! uptime  06:52:18 up 36 min,  1 user,  load average: 0.00, 0.00, 0.00 mysql> mysql> \! pwd /root mysql> (or) We can get the shell prompt here by doing, mysql> \! bash (or) mysql> \! sh HowTo: Get current working database information in mysql? Add the below lines in /etc/my.cnf [mysql] prompt=`mysql(\d)>` your  mysql environment will be, `mysql((none))>` To revert this, HowTo: Get hostname in mysql environment? Add the below lines in /etc/my.cnf [mysql] prompt=`mysql(\h)>` Also in /root/.my.cnf should have below, [client] host=valid.hostname.com user="root" pass="password" please make sure the hostname should be valid and added in /etc/hosts If you would like to return default PROMPT of mysql(this time only)