- Nagios and the plugins will be installed underneath /usr/local/nagios
- Nagios will be configured to monitor a few aspects of your local system (CPU load, disk usage, etc.)
- The Nagios web interface will be accessible at http://localhost/nagios/
- Preparing Linux for Nagios installation
- Make sure you've installed the following packages on your Fedora installation before continuing
- Apache
- GCC compiler
- GD development libraries
- They can be installed by running
- yum install httpd
- yum install gcc
- yum install glibc glibc-common
- yum install gd gd-devel
- Become the root user.
- su -l
- Create a new nagios user account 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
- Create a directory for storing the downloads.
- mkdir ~/downloads
- cd ~/downloads
- Download the source code tarballs of both Nagios and the Nagios plugins
- wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.1.2.tar.gz
- wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.13.tar.gz
- Compile and Install Nagios
- Extract the Nagios source code tarball.
- cd ~/downloads tar xzf nagios-3.1.2.tar.gz cd nagios-3.1.2
- 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 install
- make install-init
- make install-config
- make install-commandmode
- Customize Configuration
- Sample configuration files have now been installed in the /usr/local/nagios/etc directory. These sample files should work fine for getting started with Nagios. You'll need to make just one change before you proceed...
- Edit the /usr/local/nagios/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you'd like to use for receiving alerts.
- nano /usr/local/nagios/etc/objects/contacts.cfg
- Configure the Web Interface
- Install the Nagios web config file in the Apache conf.d directory.
- make install-webconf
- Create a nagiosadmin account 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
- Restart Apache to make the new settings take effect.
- service httpd restart
- Compile and Install the Nagios Plugins
- Extract the Nagios plugins source code tarball.
- cd ~/downloads tar xzf nagios-plugins-1.4.11.tar.gz cd nagios-plugins-1.4.11
- Compile and install the plugins.
- ./configure --with-nagios-user=nagios --with-nagios-group=nagios make make install
- Start Nagios
- Add Nagios to the list of system services and have it automatically start when the system boots.
- chkconfig --add nagios chkconfig nagios on
- 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
- Modify SELinux Settings
- Fedora ships with SELinux (Security Enhanced Linux) installed and in Enforcing mode by default. This can result in "Internal Server Error" messages when you attempt to access the Nagios CGIs.
- See if SELinux is in Enforcing mode.
- getenforce
- Put SELinux into Permissive mode.
- setenforce 0
- To make this change permanent, you'll have to modify the settings in /etc/selinux/config and reboot.
- Instead of disabling SELinux or setting it to permissive mode, you can use the following command to run the CGIs under SELinux enforcing/targeted mode:
- chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/ chcon -R -t httpd_sys_content_t /usr/local/nagios/share/
- Login to the Web Interface
- You should now be able to access the Nagios web interface at the URL below. You'll be prompted for the username (nagiosadmin) and password you specified earlier.
- http://localhost/nagios/
To make sure an snmp check is working you can issue the following command in /usr/local/nagios/libexe.
./check_snmp -H
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