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HG's avatar
HG
Icon for Cirrus rankCirrus
Jun 08, 2016

Question about Monitor-to-pool member association

Hi,

 

I was reading through some F5 stuff regarding monitors. On the "Association Monitors with pools and nodes" section it says :

 

"This type of association associates a monitor with an individual pool member, that is, an IP address and service. In this case, the monitor checks only that pool member and not any other members of the pool. For example, you can create an instance of the monitor http for pool member 10.10.10.10:80 of my_pool."

 

I went through an http monitor advanced options and by changing the alias IP and port to a specific member, I observed that all pool members were up after associating the new custom monitor to the pool .I believe that this can be done by using specific GET string requests as well. Does anyone know how can I exclude members or specify members to be part of an http monitor ??

 

application delivery
BIG-IP
monitors

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  • DEJ's avatar
    DEJ
    Icon for Nimbostratus rankNimbostratus
    Jun 08, 2016

    To utilize monitoring for specific pool members, you would actually associate the monitor with the pool member itself, not the pool.

     

    1. Select the pool the member or members is part of.
    2. Choose a member you want the monitoring to be assigned to.
    3. Under Advanced/Health Monitor you'll use 'Member Specific' and assign the monitor.
    4. Repeat for any pool member you want this monitor assigned to
  • Misa_222415's avatar
    Misa_222415
    Icon for Cirrus rankCirrus
    Jun 08, 2016

    Hi HG,

    That can be easily done by associating a specific monitor to one or more pool members.

    Here are some tips:

    Selecting an explicit monitor association

    Once you have associated a monitor with a pool, the BIG-IP system automatically associates that monitor with every pool member, including those members that you add to the pool later. However, in some cases you might want the monitor for a specific pool member to be different from that assigned to the pool. In this case, you must use the Health Monitors setting to specify that you want to explicitly associate a specific monitor with the pool member.
You can also configure this setting to prevent the BIG-IP system from associating any monitor with that pool member.
To explicitly associate a monitor with a pool member, locate the Health Monitors setting and select Member Specific, which causes the Select Monitors setting to appear. Then configure the Select Monitors setting as described in the following section.
To ensure that the BIG-IP system associates no monitor with the pool member, set the Health Monitors setting to None.

Member Specific: Specifies that the system monitors this pool member with the monitors configured in Select Monitors.