Chapter 10 Nagios Notification
1. How to configure
notification period
# vi
/etc/nagios/objects/server.cfg
define host & service {
use linux-server
host_name
server
alias
server
address 192.168.80.5
check_period 24x7
notification_period workhours
notification_interval 10 <- come from templates.cfg
}
# vi
/etc/nagios/objects/timeperiods.cfg
define timeperiod {
timeperiod_name workhours
timeperiod_name
24x7
}
# nagios –v
/etc/nagios/nagios.cfg ; # service nagios restart
2. How to configure
notification for groups
# vi
/etc/nagios/objects/contacts.cfg
define
contactgroup {
contactgroup_name nagios
alias
Network Operations
members chul,linux
}
define contact {
use
generic-contact
contact_name chul
alias
Jeong Chul
email tland@chul.com
}
define contact {
use
generic-contact
contact_name linux
alias
Power Linux
email linux@chul.com
}
# vi /etc/nagios/objects/server.cfg
define host & service {
use linux-server //templates.cfg
host_name server
address 192.168.80.5
check_period 24x7
notification_period workhours
contact_groups nagios
}
# nagios –v /etc/nagios/nagios.cfg; # service
nagios restart
3. How to specify
which states to be notified about
# vi /etc/nagios/objects/server.cfg
define
host {
use linux-server
host_name
server
address
192.168.80.5
contacts chul
notification_options d,u,r,f,s
//templates.cfg
notifications_enabled 1
}
define service {
contacts chul
notifications_enabled 1
notification_options w,u,c,r,f,s //templates.cfg
}
# vi /etc/nagios/objects/contacts.cfg
define contact {
use
generic-contact //templates.cfg
contact_name
chul
email tland@chul.com
host_notification_options d,u,r,f,s
service_notification_options w,u,c,r,f,s
}
※ d: Down, u: UNrechable, r: Recovering,
f: Flapping, s:
Scheduled
w: Warn, u:Unknown, c: Critical
# nagios –v
/etc/nagios/nagios.cfg
# service nagios restart
4. How to define a
custom notification method
a. Defining command
# vi
/etc/nagios/objects/commands.cfg
define command{
command_name notify-host-by-email
command_line /usr/bin/printf "%b" "*****
Nagios *****\n\nNotifi cation Type:
$NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAdd ress: $HOSTADDRESS$\nInfo:
$HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" |
}
define command{
command_name notify-service-by-email
command_line /usr/bin/printf "%b" "*****
Nagios *****\n\nNotifi cation Type:
$NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIA S$\nAddress: $HOSTADDRESS$\nState:
$SERVICESTATE$\n\nDate/Time: $LONGDATET
IME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$\n" |
b. Defining contacts in the templates
# vi /etc/nagios/objects/templates.cfg
define contact{
name generic-contact
host_notification_commands
notify-host-by-email
service_notification_commands
notify-service-by-email
}
c. Defining host and service
# vi /etc/nagios/objects/server.cfg
define host{
use linux-server
contact_groups nagios
//contacts.cfg <- templaes.cfg
# nagios –v /etc/nagios/nagios.cfg
# service nagios restart
Chapter 11 Nagios Security & Performance
1.Requiring
authentication for the web interface
a.
Adding user
#
htpasswd /etc/nagios/htpasswd.users tland
b.
Add this user to cgi.cfg
#
vi /etc/nagios/cgi.cfg
authorized_for_read_only=tland
authorized_for_all_services=nagios,tland
authorized_for_all_hosts=nagios,tland
c. Access web interface using new user
http://localhost/nagios/
2. Using authenticated contacts
a. Creating new user
# htpasswd /etc/nagios/htppasswd.uesrs linux
http://localhost/nagios
b. Editing contact and host information
# vi /etc/nagios/objects/contacts.cfg
define contact {
use generic-contacts
contact_name linux
alias Linux Admin
email linux@chul.com
}
# vi /etc/nagios/objects/linux.cfg
define host {
host_name linux
alias linux server
address 192.168.80.5
contacts nagios,linux
}
# nagos –v /etc/nagios/nagios.cfg ; # service
nagios restart
3.
Writing debugging information to Nagios log file
a.
Editing nagios.cfg
#
vi /etc/nagios/nagios.cfg
debug_level
= -1 //everything
debug_verbosity=2 //very detailed
debug_file=/var/log/nagios/nagios.log
#
touch /var/log/nagios/nagios.log
#
chown nagios.nagios /var/log/nagios/nagios.log
b.
Service restart
#
nagios –v /etc/nagios/nagios.cfg
#
service nagios restart
#
tail –f /var/log/nagios/nagios.log
4.
Monitoring Nagios performance with Nagiostats
#
vi /etc/nagios/nagios.cfg
status_file=/var/log/nagios/status.dat
#
nagiostats –c /etc/nagios/nagios.cfg
#
nagiostats –c /etc/nagios/nagios.cfg –help
Chapter 12 How to
integrate MRTG & Nagios
1.Check
MRTG data
#
service httpd restart
#
ls –l /var/www/mrtg
http://localhost/mrtg
2.
Service definition
#
vi /etc/nagios/objects/router.cfg
# Router on MRTG
define service{
use
generic-service
host_name
router
service_description
Router Bandwidth Usage
check_command
check_local_mrtgtraf!/var/www/mrtg/192.168.80.11_1.log!A VG!1000,5000!8000,50 000!10
}
3.
Command definition
#
vi /etc/nagios/objects/commands.cfg
#
check_mrtgtraf' command definition
define
command{
command_name check_local_mrtgtraf
command_line $USER1$/check_mrtgtraf
-F $ARG1$ -a $ARG2$ -w
$ARG3$,$ARG4$ -c $ARG5$,$ARG6$
}
4.
Testing MRTG and Nagios
#
nagios –v /etc/nagios/nagios.cfg
#
service nagios restart
Summary
1.
Network Monitoring Structure
2.
How to setup Managed Devices
Linux server, Windows Server, Cisco Router
& Webserver
3.
Nagios Visualization
Nagiosgraph, NDOUtils with MySQL
4.
Nagios Notification & Security with Performance
5.
Integration with Nagios and MRTG
