title: Need help understanding Nagios check_interval retry_interval max_check_attempts notification_interval notification_options
body: <p>I need your help to understand the below directives timings in Nagios.</p>
  <pre><code>check_interval  
  retry_interval  
  max_check_attempts  
  notification_interval  
  notification_options
  </code></pre>
  <p>The email notification I am getting is not correct according to the timings; it is not constant as you can see in the following screenshot:</p>
  <p><img src="https://i.stack.imgur.com/Cijc2.jpg" alt="" /></p>
  <p>It makes me confused.</p>
  <p>The first notification I received at 4:11 PM right after Nagios service restart, and later you can see there is no fixed interval.</p>
  <ul>
  <li><p>Question 1:  How to set email notification up at 10 minutes interval?</p>
  </li>
  <li><p>Question 2:  At what time interval I should get emails in my inbox with down configuration?</p>
  </li>
  </ul>
  <p>My sample node.cfg:</p>
  <pre><code>define host {
  
      use                     linux-server            
      host_name               Linux_Slave
      alias                   Linux_Slave
      check_period            24x7
      check_command           check-host-alive
      check_interval          4
      retry_interval          1
      max_check_attempts      3
      notification_period     24x7
      notification_options    d
      notification_interval   5
      contact_groups          admins
      address                 x.x.x.x
  }
  </code></pre>
  <p>Appreciate if any one of you can help me.</p>