Nagios Core - Monitoring Tool on CentOS 6.4 - part 5/5 script

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

http://localhost/nagios

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