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    31 October 2012

    Installing Nagios in CentOS 6

    by Alpha01

    Make sure you’ve installed the following packages on your CentOS installation before continuing.

    yum install httpd php gcc glibc glibc-common gd gd-devel make autoconf

    Create nagios user and give it a password.

    /usr/sbin/useradd -m nagios
passwd nagios

    Create a new nagcmd group 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

    Download and extract the latest stable Nagios Core from http://www.nagios.org/download/core/ Run the Nagios configure script, passing the name of the group you created earlier:

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

    Compile Nagios

    make all

    Install Nagios

    make install

    Update the email address associated with the nagiosadmin contact definition in /usr/local/nagios/etc/objects/contacts.cfg. Install the Nagios web config file in the Apache conf.d directory.

    make install-webconf

    Install Nagios init config

    make install-init

    Create htaccess user to access the Nagios web interface.

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

    Restart Apache to make the new settings take effect.

    service httpd restart

    Add Nagios to the list of system services and have it automatically start when the system boots.

    chkconfig --add nagios
chkconfig nagios on

    Download and extract the latest stable Nagios Plugins from http://www.nagios.org/download/plugins. Configure, compile and install the Nagios plugins.

    ./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

    Update permissions

    chown nagios.nagios /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios/libexec

    Verify the sample Nagios configuration files.

    /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

    If there are no errors, start Nagios.

    service nagios start

    Post Installation

    To make things easier to myself, the ncheck and nrestart aliases were created in /root/.bashrc to check the nagios configuration and restart the service respectively.

    alias ncheck='/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg'
alias nrestart='service nagios restart'

    Reference

    Tags: [ nagios centos ]