What is the CA recommendation on configuring APM components to communicate with each other?

Document ID : KB000015943
Last Modified Date : 14/02/2018
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Question:

 What is the best way to configure APM components in the overall communications between other APM components, i.e. Enterprise Managers (EM's) and agents?

Environment:
All current supported APM environments
Answer:

Basically you can configure the components to communicate via hostname or IP address, though you would need to determine which is more reliable for your needs:

  • Using a Fully Qualified Domain Name (FQDN), resolved by DNS, would automatically cover any server IP Address changes that might occur.  Of course, the DNS lookup performance for hostname -> IP Address resolution needs to be successful to avoid any communication delays.
  • Using FQDN would be beneficial for setting up failover EM's where the FQDN lookup automatically handles the change in IP address at failover time.  Alternatively a Virtual IP Address (VIP) approach could be used for that.
  • A FQDN may not be appropriate if you have firewalls between components where only 1 specific NIC can be used to communicate between components, i.e. the IP Address of that NIC needs to be explicitly used.
  • For EM->TIM communications, this setup requires IP Address use.