Table of Contents

1. Challenge

   Define Two Command Objects that Check the Logs **/var/log/messages** for Errors and Warnings in **/usr/local/nagios/etc/objects/commands.cfg**

   1. Add the following text to the commands.cfg file:

      define command {
      
              command_name    check_log_error
              command_line    /usr/local/nagios/libexec/check_log -F /var/log/messages -O /home/nagios/check_log.error -q "error"
      
      }
      
      

      define command {
      
              command_name    check_log_warning
              command_line    /usr/local/nagios/libexec/check_log -F /var/log/messages -O /home/nagios/check_log.warning -q "warning"
      
      }
      
      

2. Challenge

   Define Two Services that Use the Commands

   1. Add the following text to the localhost.cfg file:

      define service {
      
              use                     local-service
              host_name               localhost
              service_description     Check Log Error
              check_command           check_log_error
      
      }
      

      define service {
      
              use                     local-service
              host_name               localhost
              service_description     Check Log Warnings
              check_command           check_log_warning
      
      }
      

3. Challenge

   Give the `nagios` User Read Permissions for `/var/log/messages`

   1. Run the following command:

   sudo setfacl -R -m u:nagios:r-- /var/log/messages
   

4. Challenge

   Restart and Log In to the Nagios Server

   1. Restart the Nagios server.

   sudo systemctl restart nagios
   

   1. Navigate to http://NAGIOS_SERVER_IP/nagios, and log in with the following credentials:
      • User Name: nagiosadmin
      • Password: BlaBla321
   2. Navigate to Services.
   3. Reschedule the checks for the two services to run 10-20 seconds from the current server time.
   4. Verify that there are no errors under Status Information.