Part II: Nagios installation Configuration

Nagios Installation-server side (192.168.0.11)
Then install the Nagios-related packages
Yum install-y httpd nagios nagios-plugins nagios-plugins-all Nrpe Nagios-plugins-nrpe
Set user and password to log in to Nagios background: htpasswd-c/etc/nagios/passwd nagiosadmin
Vim/etc/nagios/nagios.cfg
Nagios-v/etc/nagios/nagios.cfg Detection configuration file

Nagios Installation-Client (192.168.0.12)
On the client machine
Yum Install-y epel-release
Yum install-y nagios-plugins nagios-plugins-all Nrpe Nagios-plugins-nrpe

Monitoring Center (192.168.0.11) add monitored host (192.168.0.12)
cd/etc/nagios/conf.d/
Vim 192.168.0.12.cfg//join:
Define Host{
Use Linux-server
HOST_NAME 192.168.0.12
Alias 0.12
Address 192.168.0.12
}

Define Service{
Use Generic-service
HOST_NAME 192.168.0.12
Service_description check_ping
Check_command check_ping!100.0,20%!200.0,50%
Max_check_attempts 5
Normal_check_interval 1
}

Define Service{
Use Generic-service
HOST_NAME 192.168.0.12
Service_description Check_ssh
Check_command Check_ssh
Max_check_attempts 5; When Nagios detects a problem, it has a total of 5 attempts to detect a problem before alerting, if the value is 1, then an immediate alarm is detected.
Normal_check_interval 1; The time interval for re-detection, in minutes, and 3 minutes by default
Notification_interval 60; After the service has an exception, the failure has not been resolved and Nagios again notifies the user of the time. Units are minutes. If you think that all events require only one notification, you can set the option here to 0.
}

Define Service{
Use Generic-service
HOST_NAME 192.168.0.12
Service_description check_http
Check_command check_http
Max_check_attempts 5

4. Continue adding services
   Service-Side Vim/etc/nagios/objects/commands.cfg
   Added: Define command{
   Command_name Check_nrpe
   Command_line $USER 1$/check_nrpe-h $HOSTADDRESS $-C $ARG 1$
   }
   Continue editing Vim/etc/nagios/conf.d/192.168.0.12.cfg
   Add the following: Define Service{
   Use Generic-service
   HOST_NAME 192.168.0.12
   Service_description Check_load
   Check_command Check_nrpe!check_load
   Max_check_attempts 5
   Define Service{
   Use Generic-service
   HOST_NAME 192.168.0.12
   Service_description check_disk_hda1
   Check_command check_nrpe!check_hda1
   Max_check_attempts 5
   Define Service{
   Use Generic-service
   HOST_NAME 192.168.0.12
   Service_description Check_disk_hda2
   Check_command Check_nrpe!check_hda2
   Max_check_attempts 5
   Description: Check_nrpe!check_load: Here the Check_nrpe is just defined in Commands.cfg, Check_load is a detection script on the remote host
   On the remote host vim/etc/nagios/nrpe.cfg search Check_load, this line is on the server to execute the script, we can manually execute this script
   Change check_hda1:/dev/hda1 changed to/DEV/SDA1
   Add another line command[check_hda2]=/usr/lib/nagios/plugins/check_disk-w 20%-C 10%-p/dev/sda2
6. Configuring alarms
   VIM/ETC/NAGIOS/OBJECTS/CONTACTS.CFG//Increase: Define contact{
   Contact_Name 123
   Use Generic-contact
   Alias Aming
   email [email protected]
   }

Define contact{
Contact_Name 456
Use generic-contact
alias AAA
Email [email protected]
Define contactgroup{
Contactgroup_name Common
Alias Common
Define service{
Use Generic-service
Host_ Name 192.168.0.12
service_description check_load
Check_command check_nrpe!check_load
max_check_attempts 5
Normal_check_interval 1
contact_groups common
notifications_enabled 1; Turn on the alert function. 1 is on, 0 is disabled. In general, this option is defined in the main configuration file (Nagios.cfg), with the same effect.
Notification_period 24x7; the time period during which reminders are sent. Very important host (service) I defined as 7x24, the general host (service) is defined as working hours. If no problem occurs, no reminder is sent if it is not within the defined time period.
Reference:

6. Configure graphical display Pnp4nagios (please do it yourself, not shown in Class)
   (2) Configure the main profile
   (3) Modify Commands.cfg
   (4) Modify the configuration file Templates.cfg
   Vim/etc/nagios/objects/templates.cfg Define host {
   Name HOSTS-PNP
   Register 0
   action_url/pnp4nagios/ index.php/graph?host= $HOSTNAME $&srv= host
   Process_perf_data 1
   }
   Define service {
   Name SRV-PNP
   Register 0
   action_url/pnp4nagios/index.php/graph?host= $HOSTNAME $&srv= $SERVICEDESC $
   (5) Modify the host and service configuration
   Vim/etc/nagios/conf.d/192.168.0.12.cfg
   to replace "define host{
   Use Linux-server"
   with:
   Define host{
   Use Linux-server,hosts-pnp

Modify the corresponding service, such as
put
define service{
Use Generic-service
host_name 192.168.0.12
Service_ Description check_disk_hda1
Check_command check_nrpe!check_hda1
max_check_attempts 5
Normal_check_ Interval 1
}
Instead:
define service{
Use GENERIC-SERVICE,SRV-PNP
host_name 192.168.0.12
Service_ Description check_disk_hda1
Check_command check_nrpe!check_hda1
max_check_attempts 5
Normal_check_ Interval 1
}

(6) Restart and start each service:
Service Nagios Restart
(7) Access test
Two methods of Access:
ip/nagios/
Nagios official website http://www.nagios.org
CENTOS6 The default Yum source does not have Nagios-related RPM packages, but we can install a epel extension source:
Yum Install-y epel-release
Start Services: Service httpd start; Service Nagios Start
Browser access: Http://ip/nagios
Vim/etc/nagios/nrpe.cfg find "allowed_hosts=127.0.0.1" changed to "allowed_hosts=127.0.0.1,192.168.0.11" after the IP for the server IP; Find "dont_blame_nrpe=0" and Change to "dont_blame_nrpe=1"
Start Client/etc/init.d/nrpe start
Normal_check_interval 1
}
The above services do not depend on the client Nrpe service, we can imagine that we can use ping or telnet on our own computer to detect whether a remote machine is alive, whether to open a port or service. When we want to detect a specific service on the client, we need to use Nrpe, for example, to know the responsibility of the client machine or disk usage.
Normal_check_interval 1
}
Normal_check_interval 1
}
Normal_check_interval 1
}
Restart the client on Nrpe services: service Nrpe restart
The server also restarts the Nagios service: service Nagios restart
}

    members                          123,456    }

and add Contactgroup to the service that needs to be alerted.
Notification_options:w,u,c,r; This is the state of the service. W is waning, U is unknown, C is critical, R is recover (resumed), similar to the state of a host: d,u,r D = status is down, U = status is unreachable, R = State reverts to OK, need to join To the definition configuration of the host.
}
Call SMS Interface http://www.aminglinux.com/bbs/thread-7380-1-1.html
Integrated http://www.aminglinux.com/bbs/thread-7917-1-1.html
(1) Installation
Yum Install Pnp4nagios RRDtool
VIM/ETC/NAGIOS/NAGIOS.CFG//Modify the following configuration

1. process_performance_data=1   2. host_perfdata_command=process-host-perfdata3. service_perfdata_command=process-service-perfdata4. enable_environment_macros=1     

Vim/etc/nagios/objects/commands.cfg//Comment off original to Process-host-perfdata and Process-service-perfdata, redefine

1. define command {  2.        command_name    process-service-perfdata  3.        command_line    /usr/bin/perl /usr/libexec/pnp4nagios/process_perfdata.pl  4. }  5.   6. define command {  7.        command_name    process-host-perfdata  8.        command_line    /usr/bin/perl /usr/libexec/pnp4nagios/process_perfdata.pl -d HOSTPERFDATA  9. }      process_perf_data               1

}
Service httpd Restart
Service NPCD Start
ip/pnp4nagios/

Part II: Nagios installation Configuration