Configuring basic nagios server
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Nagios is service monitoring tool which can periodically check status of various services and notify in case some service is not in proper state.
Installing nagios
We can install nagios using yum. Just use:
yum -y install nagios* --skip-broken
In case any specific plugin cannot be installed due to conflicts then that can be ignored by using -x option such as
yum -y install nagios* --skip-broken -xnagios-plugins-setuid
Configuring contact
Configure email server in case not already done so. Make sure that mails are getting delivered using 'mail <email_address>' command. Open 'contacts.cfg' file located in '/etc/nagios/objects' objects directory in CentOS 5.4. Change the email address of nagiosadmin to the email address tested before using mail command.
Disable selinux
For some reason SELinux interferes with nagios. So disable SELinux by using 'setenforce 0'. You might consider disabling SELinux in file /etc/sysconfig/selinux.
Setting nagios.conf for apache (httpd)
Open file '/etc/httpd/conf.d/nagios.conf' and see that nagios is accessible from at least admin stations. Also note the location of htpasswd.users file as this location is required in next step while creating user nagiosadmin and setting its password.
Setting httpd password
Use below command to configure password
htpasswd -c /etc/nagios/password nagiosadmin
The location of password file should be same as in /etc/httpd/conf.d/nagios.conf
Checking configuration is fine
We can use command 'nagios -v /etc/nagios/nagios.cfg' to see that nagios configuration is fine.
Enable nagios on system startup
We can use 'chkconfig nagios on' to enable nagios in run levels 3, 4 and 5
Start nagios for current session
We can start nagios for current session using command 'service nagios start'
Logging in into nagios
Open http://<server_ip>/nagios and give username as nagiosadmin and password setup in above setup to login.
Home > CentOS > CentOS 6.x > Monitoring tools > Nagios configuration > Configuring basic nagios server
