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+====== Nagios ======
+====== Installation ======
+  - Create the nagios group and user: <code>
+     groupadd -g 213 nagios
+     useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios
+</code>
+  - Add the 'apache' user to the 'nagios' group, so that it can write to the ''/var/nagios/rw'' directory ('a' option prevents the user to be removed from other groups, the member of which he is already): <code>
+     usermod -aG nagios apache
+</code>
+  - Install the Nagios::Plugin Perl module: <code>
+     cpan -i Monitoring::Plugin
+</code>
+  - Use [[http://sbopkg.org/|sbopkg]] or install the individual packages using scripts from [[http://slackbuilds.org/|SlackBuilds.org]], and install the following in this order:
+    * RRDTool
+    * nagios (currently, the package which can be built using a [[http://slackbuilds.org/network/nagios/ | SlackBuilds.org script]] is nagios-4.0.8)
+    * nagios-plugin package
+    * nagios-graphing
+  - Edit ''/etc/nagios/nagios.conf'' and turn off the logging: <code>
+CHANGE:
+     use_syslog=1
+TO:
+     use_syslog=0
+CHANGE:
+     log_notifications=1
+TO:
+     log_notification=0
+</code>
+  - Edit ''/etc/httpd/extra/nagios.conf'', after the ''<Directory "/var/www/htdocs/nagios">'' line: <code>
+CHANGE:
+     Options None
+TO:
+     Options FollowSymLinks
+</code>
+  - Edit ''/etc/httpd/http.conf'' <code>
+COMMENT:
+      LoadModule mpm_event_module lib64/httpd/modules/mod_mpm_event.so
+UNCOMMENT:
+     #LoadModule mpm_prefork_module lib64/httpd/modules/mod_mpm_prefork.so
+UNCOMMENT:
+     #LoadModule cgi_module lib64/httpd/modules/mod_cgi.so
+     (or #LoadModule cgi_module lib/httpd/modules/mod_cgi.so on 32bit installs)
+CHANGE:
+     <IfModule dir_module>
+     DirectoryIndex index.html
+     </IfModule>
+TO:
+     <IfModule dir_module>
+     DirectoryIndex index.html index.php
+     </IfModule>
+CHANGE:
+     # Uncomment the following line to enable PHP:
+     #
+     # Include /etc/httpd/mod_php.conf
+TO:
+     # Uncomment the following line to enable PHP:
+     #
+     Include /etc/httpd/mod_php.conf
+RIGHT AFTER:
+     DocumentRoot /srv/httpd/htdocs
+ADD:
+     Include /etc/httpd/extra/nagios.conf
+</code>
+  - Make sure apache starts at boot and start/restart apache: <code>
+     chmod 755 /etc/rc.d/rc.httpd
+     /etc/rc.d/rc.httpd restart
+</code>
+  - Set the password for //nagiosadmin// : <code>
+     htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
+</code>
+  - (Not sure if this is necessary but, leaving it in until I can test) \\ Make sure nagios starts at boot and start/restart nagios:
+    - Edit ''/etc/rc.d/rc.local'' and add: <code>
+# Start nagios:
+if [ -x /etc/rc.d/rc.nagios ]; then
+  echo "Starting nagios..."
+  /etc/rc.d/rc.nagios start
+fi
+</code>
+    - Edit ''/etc/rc.d/rc.local_shutdown'' (you may have to create this file if it does not exist, and make it executable) and add: <code>
+# Stop nagios:
+if [ -x /etc/rc.d/rc.nagios ]; then
+  echo "Stopping nagios..."
+  /etc/rc.d/rc.nagios stop
+fi
+</code>
+  - Make rc.nagios executable: <code>
+# chmod 755 /etc/rc.d/rc.nagios
+</code>
+  - Start nagios: <code>
+# /etc/rc.d/rc.nagios restart
+</code>
+====== Check That Nagios Is Running ======
+Goto **http://YOUR_MACHINE/nagios/** and you should see Nagios working.
+====== Add Users ======
+  - Run the ''htpasswd'' command for each user: <code>
+     htpasswd -c /etc/nagios/htpasswd.users bob
+     htpasswd -c /etc/nagios/htpasswd.users sue
+</code>
+  - Edit ''/etc/nagios/cgi.cfg'' and add the user(s) too: <code>
+authorized_for_all_services=nagiosadmin,bob,sue
+authorized_for_all_hosts=nagiosadmin,bob,sue
+</code> (or add "''*''" to allow all authenticated users)
+====== TROUBLESHOOTING ======
+ERROR: When browsing to the nagios webpage (as nagiosadmin) you get "You do not have permission"
+HINT: Check /var/log/httpd/error_log to see what is failing.
+FIX1: Make sure that /srv/www/htdocs/nagios is "drwxrwxr-x nagios nagios"
+FIX2: In /etc/http/httpd.conf make sure:
+    UNCOMMENT: Include /etc/httpd/mod_php.conf
+    Do the "<IfModule dir_module>" change listed above.
+-----
+ERROR: When clicking on Nagios cgi pages, they are downloaded and not executed.
+FIX: Make sure the "LoadModule cgi_module" is uncommented as described above.
+-----
+ERROR: "stderr: execvp(/usr/libexec/monitoring-plugins/check_ping, ...) failed. errno is 2: No such file or directory"
+FIX:  vi /etc/nagios/resource.cfg
+     CHANGE: $USER1$=/usr/libexec/monitoring-plugins
+     TO: $USER1$=/usr/libexec/nagios
+-----
+ERROR: I've done the FIXes above and it's still not working...
+FIX: Didya restart httpd and/or nagios?
+     /etc/rc.d/rc.httpd restart
+     /etc/rc.d/rc.nagios restart
+====== Install NRPE On A Target Machine ======
+**ON THE TARGET MACHINE (as root):**
+  groupadd -g 213 nagios
+  useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios
+Install nagios via SBo (Required by Nagios-plugins)
+Install nagios-plugins via SBo (Required by NRPE)
+Install nrpe via SBo
+Ignore the xinetd stuff, you have to run NRPE as a daemon on Slackware (unless you want to go through the headache of replacing inetd with xinetd)
+So, start NRPE in Daemon mode:
+  chmod 755 /etc/rc.d/rc.nrpe
+  /etc/rc.d/rc.nrpe start
+Test NRPE
+  /usr/libexec/nagios/check_nrpe -H localhost
+  NRPE v2.15
+  /usr/libexec/nagios/check_nrpe -H localhost -c check_users
+  USERS OK - 1 users currently logged in |users=1;5;10;0
+Add your Nagios server's IP into the allowed_hosts list:
+  vi /etc/nagios/nrpe.cfg
+	  allowed_hosts=127.0.0.1,192.168.1.77  (WHERE: 192.168.1.77 is the IP of your Nagios server)
+  chown nagios:nagios /etc/nagios/nrpe.cfg
+-----
+**ON THE NAGIOS SERVER MACHINE:**
+Add the client machine into one of the .cfg files
+I did this:
+  vi /etc/nagios/nagios.cfg
+ADD:
+	# Definitions for monitoring a linux machine
+	cfg_file=/etc/nagios/objects/linux.cfg
+  chown nagios:nagios /etc/nagios/nagios.cfg
+  vi /etc/nagios/objects/linux.cfg_file
+	  #########################################################
+	  # Linux  configuration file
+	  #########################################################
+	  define host {
+	  	  use	  	  linux-server
+	  	  host_name	  MyLinuxBox
+	  	  alias	  	  LinuxBox1
+	  	  address	  192.168.1.110
+	  	  register	  1
+	  	  }
+	  define service{
+	  	  host_name			MyLinuxBox
+	  	  service_description		PING
+	  	  check_command			check_ping!100.0,20%!500.0,60%
+	  	  max_check_attempts		2
+	  	  check_interval		2
+	  	  retry_interval		2
+	  	  check_period			24x7
+	  	  check_freshness		1
+	  	  contact_groups		admins
+	  	  notification_interval		2
+	  	  notification_period		24x7
+	  	  notifications_enabled		1
+	  	  register			1
+	  	  }
+	  #########################################################
+	  # END OF FILE
+	  #########################################################
+  chown nagios:nagios /etc/nagios/objects/linux.cfg_file
+Restart Nagios
+	  /etc/rc.d/rc.nagios restart
+====== Sources ======
+<!-- If you are copying information from another source, then specify that source -->
+<!-- * Original source: [[http://some.website.org/some/page.html]] -->
+<!-- Authors are allowed to give credit to themselves! -->
+ * Originally written by [[wiki:user:arfon | arfon]]
+<!-- * Contributions by [[wiki:user:yyy | User Y]] -->
+<!-- Please do not modify anything below, except adding new tags.-->
+<!-- You must remove the tag-word "template" below before saving your new page -->
+{{tag>howtos software nagios network_monitoring author_arfon}}

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