How to install Nagios on CentOS?

Setting nagios.cfg

Please make backup file of localhost.cfg as we will serverly use this file as a template for other cfg files.

[root@yourmachine  ~] cd /etc/nagios/objects/
[root@yourmachine  nagios] cp localhost.cfg localhost.cfg_org
[root@yourmachine  nagios] cd ..
[root@yourmachine  nagios] vi nagios.cfg

# OBJECT CONFIGURATION FILE(S)
cfg_file=/etc/nagios/objects/contactgroups.cfg
cfg_file=/etc/nagios/objects/contacts.cfg
cfg_file=/etc/nagios/objects/hostgroups.cfg
cfg_file=/etc/nagios/objects/hosts.cfg
cfg_file=/etc/nagios/objects/services.cfg
cfg_file=/etc/nagios/objects/timeperiods.cfg

# EXTERNAL COMMAND CHECK INTERVAL
command_check_interval=1

Go ahead and save the file.

Now, for each file you specified above you’ll need to create the file because it doesn’t exist within /etc/nagios/objects/.

[root@yourmachine  nagios] cd objects
[root@yourmachine  objects] touch contactgroups.cfg contacts.cfg hostgroups.cfg hosts.cfg services.cfg timeperiods.cfg
[root@yourmachine  objects] chown nagios.nagios contactgroups.cfg contacts.cfg hostgroups.cfg hosts.cfg services.cfg timeperiods.cfg