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F5 Networks Monitors

A monitor is a test of applied device for the response that has waited in a given period of time.

 Settings like how much time the monitor waits response and monitor application time range can be configured. The value of the last interval in the monitor section is the time between each monitor. Timeout value is the required time for monitor’s success control which is applied to the server.

  • Node Checks: Determines the availability of all services for a particular node. For example; ICMP control controls the machine that is awake or not by sending a ping.
  • Service Checks: Controls the services and the service ports.

For example; it controls 80th port for the servers that use HTTP.

  • Content Checks: Controls the query that services include it.

For example, in an http request, GET request is sent to the server and certain string is searched at the content of page. Content controls can include username and password.

Monitor Condition Reporting

  • Monitor condition depends on server’s response and object hierarchy.
    • The condition of virtual server is affected from pool monitor’s condition.
    • Pool condition is affected from pool member’s condition.
    • Pool members’ condition is affected from server’s condition
  • What happens when a monitor fails?
    • When a monitor audit is unsuccessful;
  • Pool member becomes a suspect.
  • LTM doesn’t send a new traffic to the member that includes unsuccessful monitor.
  • Current connections are saved.
  • If it is successful before reaching timeout value, control;
    • Traffic continues on its usual flow.
    • If failure to reach the monitor exceeds timeout value
    • Member is removed from the pool.
  • Connections are removed.