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JG's avatar
JG
Icon for Cumulonimbus rankCumulonimbus
Feb 10, 2015

Pool members with fully-qualified domain names (FQDNs): How does this work?

From release notes of v11.6.0 (on new features):   Populate pools by FQDN This release includes the ability to configure a BIG-IP system with nodes and pool members that are identified with fully...
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Mauricio_01_142's avatar
Mauricio_01_142
Icon for Nimbostratus rankNimbostratus

Hello I added first the domains needed in System>Configuration>Device>DNS. Then I created nodes using FQDN name. Then for the pool (already created) I added the nodes from FQDN list and removed the old ones using IP address. I was able to notice that for each FQDN node added to the pool, another node is created below with IP address as well. I am not sure if this is expected. Can somebody confirm this?

 

I have another question, f5 saves caché for DNS entries? as we are working on a DR plan, I would expect the f5 resolves the name to the new IP when DR plan renames the DNS entry to point to another server

 

Mauricio_01_142's avatar
Mauricio_01_142
Icon for Nimbostratus rankNimbostratus
Sep 14, 2017

LB does a DNS lookup on a default value of 3600 seconds, this can be configured on the same FQDN node, I set it to 60 seconds and worked fine. So I don´t have to worry about the caché. BTW DR plan worked awesome. FQDN nodes are able to resolve the IP addresses fine, but it would until the DNS has the updated entry first. SO it can take some time regarding the geolocation. Hope this can help