1. Advisor : Quincy Wu Speaker : Xang-Ting Date : 2010/06/08
Monitor
Advisor : Quincy Wu
Speaker : Xang-Ting
Date : 2010/06/08

2. Outline
What is nagios?
Install
Setup the web interface
Configure
NRPE

3. Nagios
Monitoring of a lot of network service(SMTP,POP,HTTP,NNTP,PING...)
Monitoring of host resources.
Web interface for monitoring.
Powerful plug-in.

4. Setup web interface $make install-webconf
Generate /etc/httpd/conf.d/nagios.conf
$service httpd restart
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Default path : /usr/local/nagios/share
Url_path:

5. Demo1

6. Conf-cgi.cfg , nagios.cfg
cgi.conf
$vi /usr/local/nagios/etc/cgi.cfg
use_authentication=1
Safer!!
nagios.conf
$vi /usr/local/nagios/etc/nagios.cfg
check_external_commands=1
This option allows you to specify whether or not Nagios should check for external commands.
command_check_interval=15s
It will leave nagios check for external commands every 15 seconds.
enable_notifications=1

7. Conf - timeperiods.cfg Make user to define monitoring period.
$vi /usr/local/nagios/etc/object/timeperiods.cfg
define timeperiod{
timeperiod_name workhours
alias Normal Work Hours
monday :00-17:00
tuesday :00-17:00
wednesday :00-17:00
thursday :00-17:00
friday :00-17:00 }

8. Configure-contacts.cfg
Define the way to notify the contacts when something is wrong.
$vi /usr/local/nagios/etc/object/
define contact{
contact_name nagiosadmin
alias sysadmin
pager xxx }
define contactgroup{
contactgroup_name sagroup
alias System Administrators
members nagiosadmin,test

9. Conf-host.cfg Define the host which you want to monitor.
$vi /usr/local/nagios/etc/object/host.cfg
define host{
host_name nagios-server
alias nagios server
address }
define hostgroup{
hostgroup_name sa-servers
alias sa Servers
members nagios-server,host1...

10. Conf-service.conf define service{ host_name nagios-server
service_description check-host-alive
check_command check-host-alive
max_check_attempts
normal_check_interval 3
retry_check_interval 2
check_period x7
notification_interval 10
notification_period x7
notification_options w,u,c,r
contact_groups sagrou }

11. w(warning) n(unknown) c(critical) r(restore) Notification options
Service notification options
w(warning)
n(unknown)
c(critical)
r(restore)
Host notification options
d(down)
u(unreachable)
r(restored)

12. Conf-command.cfg Defind the command in /usr/local/nagios/libexec
./check_udp -h
$vi /usr/local/nagios/object/command.cfg
define command{
command_name check_udp
command_line $USER1$/check_udp -H $HOSTADDRESS$ -p $ARG1$ $ARG2$ }

13. Run nagios
$/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
/etc/init.d/nagios start

14. Demo
Define my command.
Nagios with ftp

15. NRPE
When to use?

16. Thanks for Listening