The latest stable version is installed here:
Nagios-4.0.8
Nagios-plugins-2.0.3
The installation is as follows:
Preparations before installation
To use the root user to operate the server, the following software environments are required:
Apache
PHP
DCC compiler
GD development Library
You can use yum for installation:
Yum install httpd php
Yum install gcc glibc-common
Yum install gd-devel
-
Create users and user groups
Useradd-m nagios
Passwd nagios
Create a new
NagcmdGroup for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.
/Usr/sbin/groupadd nagcmd/usr/sbin/usermod-a-G nagcmd nagios/usr/sbin/usermod-a-G nagcmd apache
2. Download the Nagios and Nagios plug-ins
Create a folder/software and put the downloaded file under the/software Directory
Download: http://www.nagios.org/download
3. Compile and install nagios
# Cd/software
# Tar-zxvf nagios-4.0.8.tar.gz
# Cd nagios-4.0.8
Run the Nagios configure script, passing the name of the group you created earlier like so:
./Configure -- with-command-group = nagcmd
Compile the Nagios source code.
Make all
Install binaries, init script, sample config files and set permissions on the external command directory.
Make installmake install-initmake install-configmake install-commandmode
Don't start Nagios yet-there's still more that needs to be done...
4.
Customize Configuration
Sample configuration files have now been installed in
/Usr/local/nagios/etcDirectory. These sample files shocould work fine for getting started with Nagios. You'll need to make just one change before you proceed...
Edit
/Usr/local/nagios/etc/objects/contacts. cfgConfig file with your favorite editor and change the email address associated with
NagiosadminContact definition to the address you 'd like to use for processing alerts.
Vi/usr/local/nagios/etc/objects/contacts. cfg
5.
Configure the Web Interface
Install the Nagios web config file in the Apache conf. d directory.
Make install-webconf
Create
NagiosadminAccount for logging into the Nagios web interface. Remember the password you assign to this account-you'll need it later.
Htpasswd-c/usr/local/nagios/etc/htpasswd. users nagiosadmin // Here I set the password to 123456
Restart Apache to make the new settings take effect.
Service httpd restart
Note: Consider implementing the ehanced CGI security measures described here to ensure that your web authentication credentials are not compromised.
6. Install the nagios plugin
Cd/software
Tar-zxvf nagios-plugins-2.0.3.tar.gz
Cd nagios-plugins-2.0.3
./Configure -- with-nagios-user = nagios -- with-nagios-group = nagios
Make
Make install
7. Start nagios
Add nagios to startup
Chkconfig -- add nagios
Chkconfig nagios on
Verify whether the nagios configuration file is correct:
/Usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios. cfg
If no error occurs, enable nagios:
Service nagios start
8. Disable selinux
Vim/etc/selinux/config
Change SELINUX = enforcing to SELINUX = disabled
After modification, the system must be restarted to take effect.
Temporary effect:
# Setenforce 0
9. Log on to the browser
The username is nagiosadmin and the password is 123456
Http: // localhost/nagios/
Here, port 80 is changed to port 800 by default, as shown in the figure below:
Projects of the current local machine monitored by default:
10. nagios configuration file description
After nagios is installed, the main directory is/usr/local/nagios. All configuration files are in the/usr/local/nagios/etc directory:
Cgi. cfg
Htpasswd. users // used for web login verification.
Nagios. cfg // Main configuration file of nagios. If you are monitoring other hosts, you need to add configuration files for other hosts.
Resource. cfg // defines the location of the nagios plug-in
The objects directory is also a very important Directory. Most operations are performed here. Its default files include:
Commands. cfg // command definition file, where commands can be referenced by other configuration files
Contacts. cfg // file that defines contacts and contact groups
Localhost. cfg // monitor local files
Printer. cfg // template file for printer monitoring, disabled by default
Switch. cfg // template file for monitoring vro, which is not enabled by default
Templates. cfg // defines the template configuration file for the host and service, which can be referenced in other configuration files
Timeperiods. cfg // defines the configuration file of the nagios monitoring period
Windows. cfg // the configuration file for monitoring windows hosts. It is not enabled by default.
Monitor local machine:
Add local monitoring to/usr/local/nagios/etc/nagios. cfg, which has been added by default:
Export _file =/usr/local/nagios/etc/objects/localhost. cfg
By default, the local configuration file monitors eight services: Current load, Current Users, HTTP, PING, Root Partition, SSH, Swap Usage, and Total Processes.
Add a monitoring rule for local/data partitions:
Vim localhost. cfg
Add
Define service {
Use local-service
Host_name localhost
Service_description Data Partition
Check_command check_local_disk! 20%! 10%! /Data
Notifications_enabled 1
}
Save and restart the nagios service. Log on to the web.
Settings for sending emails to Nagios:
Download sendmail http://caspian.dotconf.net/menu/Software/SendEmail/
Cd/usr/local/
Tar-zxvf sendEmail-v1.56.tar.gz
Copy the executable cp sendEmail-v1.56/sendEmail/usr/local/bin/
Sending test:
# SendEmail-f nagios@domain.com-t 7344506@qq.com-s mail.domain.com-u "This is subject"-xu nagios-xp passpwd-m This is content.
Explanation:
-F indicates the sender's email address.
-T indicates the recipient's email address.
-S indicates the domain name or ip address of the SMTP server
-U indicates the subject of the email.
-Xu indicates the SMTP authentication User name
-Xp indicates the password for SMTP verification. (Note that this password seems to be restricted. For example, I use d! 5neyland cannot be correctly identified)
-M indicates the Mail content
Modify commands. cfg
Vim/usr/local/nagios/etc/objects/commands. cfg
# 'Policy-host-by-email 'command definition
Define command {
Command_name sort Y-host-by-email
Command_line/usr/bin/printf "% B" "****** Nagios ***** \ n \ nNotification Type: $ icationicationtype $ \ nHost: $ HOSTNAME $ \ nState: $ HOSTSTATE $ \ nAddress: $ HOSTADDRESS $
\ NInfo: $ HOSTOUTPUT $ \ n \ nDate/Time: $ LONGDATETIME $ \ n "| sendEmail-f nagios@domain.com-t $ CONTACTEMAIL $-s mail.domain.com-u" ** $ icationicationtype $ Host Alert: $ HOSTNAM
E $ is $ HOSTSTATE $ ** "$ CONTACTEMAIL $-xu nagios-xp password
}
# 'Your Y-service-by-email 'command definition
Define command {
Command_name sort Y-service-by-email
Command_line/usr/bin/printf "% B" "****** Nagios ***** \ n \ nNotification Type: $ icationicationtype $ \ n \ nService: $ SERVICEDESC $ \ nHost: $ HOSTALIAS $ \ nAddress: $ HOSTA
DDRESS $ \ nState: $ SERVICESTATE $ \ n \ nDate/Time: $ LONGDATETIME $ \ n \ nAdditional Info: \ n $ SERVICEOUTPUT $ \ n "| sendEmail-f nagios@domain.com-t $ CONTACTEMAIL $-s mail.domain.com-u" ** $ Reply IC
ATIONTYPE $ Service Alert: $ HOSTALIAS $/$ SERVICEDESC $ is $ SERVICESTATE $ ** "$ CONTACTEMAIL $-xu nagios-xp password
}
Save and restart the nagios service.
