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MrCurlew_122275's avatar
MrCurlew_122275
Icon for Nimbostratus rankNimbostratus
Apr 02, 2014

HTTPS Health Monitor Question

Need assistance understanding how best to implement an https health monitor for an external facing website. My goal is to mark a pool member down when it's unavailable. I've read about how to create a custom monitor like "GET /default.aspx HTTP/1.1\r\nHost: www.example.com\r\nConnection: Close\r\n\r\n" and look for specific text in the response string, but slightly confused about behavior of this monitor. So... if I assign this monitor to a pool containing 2 web servers what happens. Does the f5 run this monitor for each pool member and mark a server down if it fails? If the monitor is looking at the DNS name for the site how does it determine which server is down? In my instance the DNS site name would resolve to the VIP (internally) so the monitor could potentially hit any server in the pool. Should I look at implementing https health monitors at the node level? I am running LTM 11.3.

 

application delivery
healt monitor
LTM
management
monitor

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  • IheartF5_45022's avatar
    IheartF5_45022
    Icon for Nacreous rankNacreous
    Apr 03, 2014

    Does the f5 run this monitor for each pool member and mark a server down if it fails?

     

    Yes

     

    If the monitor is looking at the DNS name for the site how does it determine which server is down?

     

    The monitor won't look at the DNS name for the site - it will just initiate an HTTPS connection with each IP in the pool. It will know which server is down. Have you tried it? It should work just fine as documented.