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Configuring DNS

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Each system used in the implementation of a Care Connect System should use DNS services to resolve system names to the addresses of the systems. DNS 'A Record' entries should be added to allow systems to resolve load balancer addresses and external names. 

Without a distributed DNS, each computer must check its host file and DNS server to discover a domain name's IP address. If the DNS server does not know which IP is set for a domain name, and if there is no record of this in the hosts file, the computer does not know which IP address to open. The user will not be able to access this site, even if he or she can can establish a connection to it. To prevent this situation, you must configure the DNS server.

Configuring the Hosts File

Each server in the Care Connect System should be configured to use names instead of IP addresses by utilizing the hosts file. The hosts file should be configured even if the server has DNS so that all self-referential requests go to the server itself rather than through the load balancer.

  1. Navigate to C:\Windows\System32\drivers\etc.
  2. Open the hosts file with a text editor.
  3. At the end of the hosts file, enter 127.0.0.1.
  4. Press Tab on the keyboard.
  5. Enter the domain name of the premise server. 
  6. Add entries for the following:
    • Spok Mobile External Load Balancer
    • Care Connect Platform Load Balancer (if different)
    • Primary SQL Server
    • Mirror SQL Server (if using SQL Mirroring)

  7. After you are finished making changes, save the hosts file.