Why health checkup is important

F5 : LOAD BALANCER
WHY HEALTH  CHECK IS IMPORTANT?
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Every application is accessed by large group of users. Applications are hosted on servers
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If application is hosted on a single server, server will not be able to handle so many request
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What is the solution then?
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We will host application on multiple physical servers.
Lets name them as S1, S2 and S3.
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Now we configure Server Pool which is the logical clustering of S1, S2 and S3.
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Logical clustering means we will configure VIP (Virtual IP) which represents S1, S2 and S3 as single entity
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Now Request from users to access application will not go to individual server, instead requests will go to Cluster first and then depending upon algorithm different servers will cater the incoming requests
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Now most important point is to keep health check of different servers to confirm which all are fit or unfit to handle requests
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If Health check is not performed correctly, then request might go to the server which is unfit. Due to this, User traffic will simply drop and user will not be able to access the application.