Category: Windows

Windows NLB load balancing is free to use with Windows Server.

If 2 servers are setup in cluster: Server 1 and Server 2

General Logic

  • There is a Virtual IP address (VIP) bound to 2 network cards (NICS), the main site domain is setup to point at this.
  • All requests use sticky sessions
  • Server 1 is the primary server and all routing is directed via server 1

If Server 1 fails

  • any new connections are refused
  • existing users on Server 2 are ok

If Server 1 is gracefully removed from cluster

  • Server 2 becomes primary
  • Existing users on Server 1 will lose session and be redirected to Server 2

If Server 2 fails or is gracefully removed from cluster

  • All requests are handled by Server 1
  • Existing users on Server 2 will lose session and be redirected to Server 1

If Server 1 fails server 2 can be made the primary server manually.

 

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