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Network Design For My Application in Oracle Cloud

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I am trying to design network for my application in cloud. My choice of cloud is oracle cloud here. There will be two VMs in same subnet (one will be master and other as failover), both will be running same web application in docker container. A public IP that can be added to CloudFlare for routing traffic to. I am thinking to install Keepalived for health check and routing traffic to failover server. Keepalived will do a health check using a url and if response is not received from url then start routing the traffic to failover and send email notification to me about the problem.

So far so good theoretically but what I don't know is:

  1. How to route traffic received on public IP to floating IP of keepalived?
  2. Do I need any load balancer?
  3. Do I need HAProxy setup instead of load balancer since I have seen HAProxy being used with Keepalived?

I have tried doing google for this but did not found any good thread that can help.

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