Benrwong: Created page based on "HOW TO INSTALL NAGIOS" from Lab Manual

2016-06-30T21:45:28Z

Created page based on "HOW TO INSTALL NAGIOS" from Lab Manual

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==Installation==
yum install php httpd mysql gd gd-devel gcc glibc glibc-common nagios nagios-plugins-all nagios-plugins-nrpe nrpe
service mysqld start
change the root password #Just in case
service mysqld stop
edit the firewall to allow port 80 from everywhere 
vim /etc/nagios/objects/contacts.cfg => Change the email to your email 
vim /etc/httpd/conf.d/nagios.conf 
Comment out the lines “Order allow,deny” and “Allow from all” and add these lines:
Order deny,allow
Deny from all
Allow from 127.0.0.1 169.230.26.0/24 169.230.90.0/24 10.20.0.0/16 
htpasswd /etc/nagios/passwd nagiosadmin
service nagios start
service httpd start
chkconfig nagios on
chkconfig httpd on 
==CONFIGURE NAGIOS/ADDING CLIENTS: ==
http://nagios.sourceforge.net/docs/3_0/macrolist.html
http://nagios.sourceforge.net/docs/3_0/monitoring-publicservices.html
http://wiki.centos.org/HowTos/Nagios 
Plugins list:
https://nagios-plugins.org/doc/man/index.html
To see how a specific plugin works (say for ssh):
/usr/lib64/nagios/plugins/check_ssh --help
The different timeperiods are defined here:
/etc/nagios/objects/timeperiods.cfg
Dummy templates for setting up dummy client.cfg files are here:
/etc/nagios/objects/templates.cfg
To add a client:
ssh to the client and do the following:
yum install nrpe nagios-plugins-all openssl
vim /etc/nagios/nrpe.cfg => Changed:
allowed_hosts=169.230.26.197 (the ip of the nagios server)
service nrpe start
chkconfig nrpe on 
*******NOTE FOR CENTOS 5*****************
For i386:
rpm -Uvh http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS//rpmforge-release-0.5.3-1.el5.rf.i386.rpm
For x86_64:
rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
*******************************************************
Back on nagios server:
vim /etc/nagios/nagios.cfg
Uncomment this line => cfg_dir=/etc/nagios/servers
mkdir /etc/nagios/servers
vim /etc/nagios/servers/client_hostname.cfg
I created one that looks like this for delta.cfg:
++++++++++++++++++++++++++++++++++++++++++++
define host{
use linux-server
host_name delta.cluster.ucsf.bkslab.org
alias delta
address 10.20.1.4
max_check_attempts 5
check_period 24x7
notification_interval 30
notification_period 24x7
} 
define service {
use generic-service
host_name delta.cluster.ucsf.bkslab.org
service_description PING
check_command check_ping!100.0,20%!500.0,60%
}
define service {
use generic-service
host_name delta.cluster.ucsf.bkslab.org
service_description SSH
check_command check_ssh
notifications_enabled 1
}
define service {
use generic-service
host_name delta.cluster.ucsf.bkslab.org
service_description Current Load
check_command check_local_load!5.0,4.0,3.0!10.0,6.0,4.0
}
+++++++++++++++++++++++++++++++++++
service nagios restart
That’s pretty much it!

[[Category:Sysadmin]]
[[Category:Tutorials]]
Nagios Hostgroups:

On the nagios server:
vim /etc/nagios/nagios.cfg
Add the line => cfg_file=/etc/nagios/objects/hostgroups.cfg
vim /etc/nagios/objects/hostgroups.cfg =>
define hostgroup{
hostgroup_name cluster_2
}

Then to add a server to this hostgroup:
vim /etc/nagios/servers/delta.cfg
Add this line within the “define host” curly brackets => hostgroups cluster_2

service nagios restart

==References:==
http://www.unixmen.com/install-and-configure-nagios-in-centos-6-4-rhel-6-4/
https://www.digitalocean.com/community/tutorials/how-to-install-nagios-on-centos-6

How to Install Nagios - Revision history

Benrwong: Created page based on "HOW TO INSTALL NAGIOS" from Lab Manual