Nagios installation and configuration in RHEL

Install Apache on the server first. Download the following software from http://www.nagios.org: nagios-3.2.3.tar.gznagios-plugins-1.4.15.tar.gznrpe-2.12.tar.gz install NagiosCore # Switch to root user su-l # Add na

Install Apache on the server first.

Download the following software from http://www.nagios.org:

• Nagios-3.2.3.tar.gz
• Nagios-plugins-1.4.15.tar.gz
• Nrpe-2.12.tar.gz

Install Nagios Core

 
 

  
  
# Switch to the root user
  
  
Su-l
  
  

  
  
# Add a nagios user
  
  
Useradd-m nagios
  
  
Passwd nagios
  
  

  
  
# Create a nagcmd group to allow users to execute commands on the web.
  
  
Groupadd nagcmd
  
  
Usermod-a-G nagcmd nagios
  
  
Usermod-a-G nagcmd apache
  
  

  
  
Tar xzvf nagios-3.2.3.tar.gz
  
  

  
  
Cd nagios-3.2.3
  
  

  
  
./Configure -- with-command-group = nagcmd
  
  

  
  
Make all
  
  

  
  
Make install
  
  
Make install-init
  
  
Make install-config
  
  
Make install-commandmode
 
 

After configure is complete, the following prompt is displayed:

 
 

  
  
General Options:  
  
  
-------------------------  
  
  
       Nagios executable:  nagios  
  
  
       Nagios user/group:  nagios,nagios  
  
  
      Command user/group:  nagios,nagcmd  
  
  
           Embedded Perl:  no  
  
  
            Event Broker:  yes  
  
  
       Install ${prefix}:  /usr/local/nagios  
  
  
               Lock file:  ${prefix}/var/nagios.lock  
  
  
  Check result directory:  ${prefix}/var/spool/checkresults  
  
  
          Init directory:  /etc/rc.d/init.d  
  
  
 Apache conf.d directory:  /etc/httpd/conf.d  
  
  
            Mail program:  /bin/mail  
  
  
                 Host OS:  linux-gnu  
  
  
  
  
  
Web Interface Options:  
  
  
------------------------  
  
  
                HTML URL:  http://localhost/nagios/  
  
  
                 CGI URL:  http://localhost/nagios/cgi-bin/  
  
  
Traceroute (used by WAP):  /bin/traceroute  


 
 

Configuration file directory/usr/local/nagios/etc

Modify the email address in/usr/local/nagios/etc/objects/contacts. cfgNagios@xxx.edu.cn. This mailbox is configured with a filter rule to forward all emailsXxx@139.com

Copy the fragment in/root/nagios-3.2.3/sample-config/httpd. conf to/usr/local/apache2/conf/httpd. conf.

Add a nagiosadmin user

/usr/local/apache2/bin/htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Install Nagios Plugins

 
 

  
  
tar xzvf nagios-plugins-1.4.15.tar.gz  
  
  
cd nagios-plugins-1.4.15  
  
  
  
  
  
./configure --with-nagios-user=nagios --with-nagios-group=nagios  
  
  
  
  
  
make  
  
  
  
  
  
make install  

 
 

Command installed in the/usr/local/nagios/libexec/directory

Start Nagios

 
 

  
  
Chkconfig -- add nagios # add nagios to the service
  
  
Chkconfig nagios on # enable this service
  
  
Chkconfig -- list nagios # view service startup status
  
  

  
  

  
  
# Check whether the script is correct
  
  
/Usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios. cfg
  
  

  
  
Service nagios start
 
 

Access http: // ip/nagios/

Install NRPE

Install Nagios Plugins first. If the agent is installed on the monitored host, add a nagios user first.

 
 

  
  
tar xzvf nrpe-2.12.tar.gz  
  
  
cd nrpe-2.12  
  
  
  
  
  
./configure  
  
  
make all  
  
  
  
  
  
make install-plugin  
 
 

Install NRPE Daemon

NRPE Daemon port 5666

Follow the previous steps to install NRPE

 
 

  
  
make install-daemon  
  
  
make install-daemon-config  
  
  
  
  
  
make install-xinetd  
 
 

After the installation is complete, the configuration file of NRPE is in/usr/local/nagios/etc/nrpe. cfg.

Edit/etc/xinetd. d/nrpe

Only_from = 127.0.0.1 # Only one IP address can be added here

Edit/etc/services and add

nrpe 5666/tcp # NRPE

Restart the xinetd service

service xinetd restart

Run the following command to check whether the service is started properly

Netstat-at | grep nrpe # The following prompt should appear:Tcp 0 0 *: nrpe *: * LISTEN

Test the NRPE Deamon Service

# Test the Local Machine/Usr/local/nagios/libexec/check_nrpe-H localhost # Remote Test/Usr/local/nagios/libexec/check_nrpe-H 202.195.160.46 # Normal displayNRPE v2.12

Edit/usr/local/nagios/etc/objects/commands. cfg on the monitoring host and add the following command.

 
 

  
  
define command{  
  
  
        command_name  check_nrpe  
  
  
        command_line  $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$  
  
  
} 


 
 

Restart the Nagios service of the monitoring host

service nagios restart