Table of Contents
Nagios installation on CentOS 6.2
Nagios server
- disable selinux
- install packages and enable users
rpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm yum -y install httpd php gd mod_ssl nagios* htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
- check that you have nagiosadmin user in /etc/nagios/cgi.cfg
- edit /etc/nagios/objects/contacts.cfg to include your data, at least your email
service nagios restart service httpd restart
- test /nagios URL in your server
Nagiosgraph
- fetch nagiosgraph rpm from http://sourceforge.net/projects/nagiosgraph/files/nagiosgraph/
- in shell
service nagios start service httpd start
- test with your browser addresses
https://server/nagiosgraph/cgi-bin/showconfig.cgi https://server/nagiosgraph/cgi-bin/show.cgi
- edit file /etc/nagios/objects/templates.cfg and add to the end of file
define service { name graphed-service action_url /nagiosgraph/cgi-bin/show.cgi?host=$HOSTNAME$&service=$SERVICEDESC$' onMouseOver='showGraphPopup(this)' onMouseOut= 'hideGraphPopup()' rel='/nagiosgraph/cgi-bin/showgraph.cgi?host=$HOSTNAME$&service=$SERVICEDESC$&period=week&rrdopts=-w+450+-j register 0 }
- Add graphed functionality to your server object definition file /etc/nagios/objects/host.cfg
define service{ use local-service,graphed-service host_name localhost service_description PING check_command check_ping!100.0,20%!500.0,60% }
- restart nagios and wait a few minutes
Nagios NRPE client installation
NRPE client enables Nagios to query and use plugins remotely from Linux and Windows servers. This one is about Linux client.
- install software with yum
yum install nagios-nrpe nagios-plugins nagios-plugins-nrpe
- use nrpe daemon or xinetd, this one uses daemonized nrpe
vi /etc/nagios/nrpe.cfg
- fix allowed_hosts according to your environment
- fix the check commands according to your environment (w = warning, c = critical limit)
command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10 command[check_load]=/usr/lib64/nagios/plugins/check_load -w 10,7,4 -c 20,15,10 #command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20 command[check_rootv]=/usr/lib64/nagios/plugins/check_disk -w 10% -c 5% -p /dev/mapper/vg_myserver-rootv command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 350 -c 400
- if you wish you can describe the service to /etc/services, needed if xinetd is used
nrpe 5666/tcp # Nagios NRPE
- make iptables allow rules if necessary
iptables -I INPUT -p TCP --dport 5666 -s nagios-server-ip service iptables save
- start nrpe daemon
service nrpe start
- do testing in client
/usr/lib64/nagios/plugins/check_nrpe -H localhost
/usr/lib64/nagios/plugins/check_nrpe -H localhost -c check_users
- do testing in nagios server
/usr/lib64/nagios/plugins/check_nrpe -H client-ip
- edit file /etc/nagios/objects/commands.cfg
define command{ command_name check_nrpe command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ }
- add the host to nagios server
vi /etc/nagios/objects/host.cfg
- example data for /etc/nagios/objects/host.cfg
define host{ use linux-server host_name myhost alias My Virtual server address 192.168.1.2 } define service{ use local-service,graphed-service host_name myhost service_description PING check_command check_ping!100.0,20%!500.0,60% } define service{ use local-service,graphed-service host_name myhost service_description Root Partition check_command check_nrpe!check_rootv }
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