How to install Nagios 2.x in Linux (Debian & Redhat)
- Operating System : Debian 3.1 (Sarge) and Redhat Enterprise Linux.
- Webserver : Apache 2
- Nagios : 2.3.1 (Stable)
Lets start with downloading Nagios. Nagios can be downloaded from
Pre-Setup:
Create a User Account that Nagios runs as (Default: Nagios)
# useradd nagios
This should create the user account and a default group with the same name (nagios). This can be checked by
# grep nagios /etc/passwd
This should show the group (if created) with the members.
If the group is missing then create the group by,
# groupadd nagios
This group can be used as the group that Nagios uses as a Command group.
Add the Nagios user and the user which the webserver (Apache) runs as
In Debian, the user is www-data
In Redhat, this is apache.
You can also check this from the config file of the webser by using one th following:
Debian
# grep “^User” /etc/apache2/apache2.conf
or
# ps -ef | grep apache (if Apache is running)
Redhat
# grep “^User” /etc/httpd/conf.d/httpd.conf
or
# ps -ef | grep apache (if Apache is running)
Add webserver user (www-data/apache) and Nagios user (nagios)
# usermod -G nagios nagios
#usermod -G www-data,nagios www-data (Debian)
#usermod -G apache,nagios apache (Redhat)
Check i the users are the members of the group by
# grep nagios /etc/group
Create the Nagios root directory
The default folder is /usr/local/nagios
# mkdir /usr/local/nagios
All is done and we are ready to install
Download Nagios
# wget http://prdownloads.sourceforge.net/nagios/nagios-2.3.1.tar.gz?download
# tar -zxvf nagios -version.tar.gz (for example nagios-2.3.1.tar.gz)
This will create the Nagios-version folder (nagios-2.3.1)
Change directory to the newly created directory
# cd nagios-version (nagios-2.3.1)
Run the configure script
# ./configure –prefix=/usr/local/nagios –with-cgiurl=/nagios/cgi-bin –with-htmurl=/nagios/ –with-nagios-user=nagios –with-nagios-group=nagios –with-command-group=nagios
where
–prefix=/usr/local/nagios is the Nagios root folder
–with-cgiurl=/nagios/cgi-bin is the Nagios CGI folder
–with-htmurl=/nagios/ is the Nagios HTML/Website folder
–with-nagios-user=nagios is the Nagios user
–with-nagios-group=nagios is the Nagios group
–with-command-group=nagios is the Nagios command group which has webserver user (Apache) and the nagios user as members.
Install the base software and HTML files
# make && make install
Install the init scripts
# make install-init
Create the required directory for command file and assign appropriate permissions to it for the external commands.
# make install-commandmode
Install the sample configs.
# make install-config
This is optional but is a very good starting point to get your nagios going.
Rename the sample config files installed in the /usr/local/nagios/etc directory from .cfg-sample to .cfg format.
# mv bigger.cfg-sample bigger.cfg
Similary rename all the files in the folder.
Now, you have a completely installed nagios to work on. The next steps would be to install the plugins and start configuring Nagios.
Prior to that, it is imporant to install the GD-Utils for the Status Maps to work properly.
In Debian, the following should install the required libraries:
# apt-get install libgd2-xpm libgd2-xpm-dev libgd2 libgd2-dev libpng12-dev libjpeg62-dev libgd-tools libpng3-dev
In Redhat Linux the following will install JPG/PNG binaries:
# yum install libpng* libjpeg* libpng3*
Now, download the GD-Utils from the following website:
Untar the downloaded Tar file by
# tar -zxvf gd-2.0.33.tar.gz
Change to the directory and run the config script.
# cd gd-2.033
# ./configure
Now, install using
# make && make install
This should install the GD-Utils.
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