It all depends upon what service you want to put under HA. For example. web server (Apache) or mail server etc. Procedure to ha some time changes for example MySQL server clustering different than normal web server. So let us know
1) What service/server you want?
2) You want to setup Application/Service Failover or IP Load Balancing? Both are different but comes under HA
Let us know then we can guide you further

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