Install Nagios 4 on CentOS/RHEL6
Install Nagios 4 on CentOS/RHEL6
Nagios has worked hard to secure it’s seat as one of the world’s best enterprise monitoring systems. Nagios alerts about critical business processes such as certificate expiration, as well as supports multiple platforms including Windows and Linux.
Let’s get started, login, and su to root
first let’s install some pre-requisites
we also need to install the development tools:
modify your hosts file as appropriate
obviously modify this part
configure apache to start on startup, and start the service now
setup the nagios user account
configure group permissions
Compile/Install Nagios:
Before proceeding, please review the document on Building a RPM From Source you will need to have a decent understanding before proceeding. We have saved you alot of time by building the SPEC files, all you have to do is compile the code.
you will also need to bulid the following rpms to be able to install the nagios-plugins, make an RPM from those as well
http://pkgs.repoforge.org/perl-Net-SNMP/perl-Net-SNMP-5.2.0-1.2.rf.src.rpm
http://pkgs.repoforge.org/perl-Crypt-DES/perl-Crypt-DES-2.05-3.2.rf.src.rpm
you may want to setup sudo for the nagios user to compile the packages.
After your packages have all been compiled, not then need to be installed on the server
change to the directory where you built your RPM’s, or download your RPM’s from your build server
install the Nagios RPM
install the perl-Crypt DES RPM
change to the noarch directory, and install the perl-Net-SNMP RPM
now we are finally able to install our nagios-plugins package
now if we try to start nagios, we get an error
let’s create the directory, and set the necessary permissions
try to start nagios again
it will likely fail due to the following error:
nagios: Error: failed to access() /usr/bin/nagios: Permission denied
to correct the error chmod 775 /usr/bin/nagios
now is also a good time to enable startup
now we just need to setup apache:
edit the default apache configuration
update the config to contain a new document root
from here based on the /etc/httpd/conf.d/nagios.conf file, we need to add the nagiosadmin
restart apache and nagios one final time
browse to http://hostname
enter your username/password that you just set
you should now be on the nagios home page.
You may see the following error:
tail /var/log/messages shows:
Nov 13 23:03:18 nagios2 nagios: Error: Unable to create temp file ‘/var/nagios.tmphqt4d2’ for writing status data: Permission denied
Nov 13 23:03:28 nagios2 nagios: Error: Unable to create temp file ‘/var/nagios.tmpr5AVEL’ for writing status data: Permission denied
now refresh, you should see the following:
That’s It!
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