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es:howtos:software:nagios [2019/02/28 01:49 (UTC)] (actual)
slackwarespanol creado
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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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