Installing Nagios on Fedora

If you follow these instructions, here's what you'll end up with:

• 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 -p -w 35 -c 40 -o 1.3.6.1.4.1.1748.3.1.1.6.0
 

Preparing Fedora

# Install wget a utility for retrieving files using the HTTP or FTP protocols
yum install wget

# Install wput a utility for uploading files or whole directories to remote ftp-servers
yum install wput

#install apache
install httpd

#install GNU Compiler Collection (GCC). A compiler system produced by the GNU Project #supports languages: C, C++, Objective-C, Fortran, and Java compiler
yum install gcc

#install the corresponding desired libraries
yum install gcc-ada
yum install gcc-java
yum install gcc-objc

Installing and Configuring TFTP Server on Linux

• Install
• yum install tftp-server
• Setup 
• nano /etc/xinetd.d/tftp
• Find disable = yes, make it no 
• change server_args to the location that you want the root of the tftp server to be in 
• -v is necessary so the tftp will log all requests 
• -c option allows you to upload files to the tftp server without them first existing
• 
  
  
  
  
  
  

  server_args             = -v -s /tftpboot 

• Start TFTP Server (Note: auto-startup tftp might not be good idea)
•  /sbin/chkconfig tftp on
• /sbin/chkconfig xinetd on
• 
  
  
  
  

  /sbin/service xinetd start 

• Testing
•  touch /tftpboot/test
• From another computer, Linux, OS X:
• tftp [ip of tftp server]
• tftp get test
• tftp quit
• From another computer, Windows OS:
• tftp 192.168.0.1 GET test
• If you can see “test” under the current directory, then this TFTP server should work properly.
• If not, check the firewall, open UDP port 69. You can run system-config-security to open it.
• You can use grep tftp /var/log/messages to see the log

Installing and Configuring Apache & PhpMyAdmin on Fedora

If you install Phpmyadmin on Fedora using yum, it will place the files in /usr/share/phpmyadmin
and will add phpmyadmin.conf to the /etc/httpd/conf.d folder. To configure http://[url]/phpmyadmin to go to the /usr/share/phpmyadmin folder

Remote Desktop from linux to windows

To be able to rdp from a linux box to a windows box you must have find a program that uses windows' proprietary rdp protocol. http://www.rdesktop.org/ seems to be the best program this. The rdesktop software requires libX11-devel to be installed

To install rdesktop:

1. yum install libX11-devel
2. cd  /home/[username]/Download
3. wget http://prdownloads.sourceforge.net/rdesktop/rdesktop-1.6.0.tar.gz?download
4. tar -xvzf rdesktop-1.6.0.tar.gz
5. cd redesktop-1.6.0
6. ./configure
7. make
8. makeinsall

To run rdesktop:

1. run rdesktop from the command line

VPN From Fedora to Edgemarc

To setup a PPTP connection in Fedora that mimics the default for a windows VPN (PPTP) connection, do the following: 

• Add PPTP VPN connection
• Set host, username and password
• Click advanced
• Check only MSCHAPv2 for authentication methods
• Click use Point-to-Point encryption (MPPE)
• Leave Security at "All Available"
• Under IPv4 settings
• Under routes
• Uncheck "use this resource only for resources on its network"

Installing X-lite on Fedora

• Download the linux distro of x-lite 
• Download the following dependent pacakages
• yum -y install compat-libstdc++-33 compat-libstdc++-296

Start Services Automatically in Linux

• add the script to be executed at startup to /etc/rc.d/rc.local
• if you dont want to follow the symlinks in /etc/rc.d/* directories you can use the graphical interface to configure
• The following cli commands will also make services start automatically
• chkconfig snmpd --list
• chkconfig snmpd on

Installing Apache on Fedora

• Restart Apache
• apachectl restart
• Edit httpd.conf
• nano /etc/httpd/conf/httpd.conf
• Make sure mod rewrite is loaded
• uncomment mod_rewrite line in httpd.conf
• When installing php, use installer and add the following lines to httpd.conf
• LoadModule php5_module "c:/program files/php/php5apache2_2.dll"
• AddType application/x-httpd-php .php .php5
• PHPIniDir "c:/program files/php"