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How to secure Load Balancer – 100 days of Cloud: Day 24


DAY 24 – Securing your Load Balancer with CloudFront – Day Twenty Four

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100 days of Cloud on GitHub – Read On – Read on

Restrict your LoadBalancer’s public access, let internet have access to your app only via CloudFont.


  • Understanding of how LoadBalancer work.
  • Your app delivering content via CDN from LoadBalancer.
  • Application Load Balancer with at least one listener.Image LB


Updating Rules

As of now I believe you have at least configured Listeners for your Load Balancer.

lets update the rules for the listener

  • goto LoadBalaner from EC2 dashboard and select your LB.
  • Then Select listeners and Click View/edit rules
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  • Select edit
  • Delete the current forward to , and click add actionthen Return fixed response….
  • Response code = 403 , Content-Type = text/plain , Response body = Access Denied , Now click the tick mark and update.

Custom header rule

In this stage we create a Custom header.

  • Goto + and click Insert Rule.
  • Add condition as Http header.
  • add X-Custom-Header as header Header name, give a random unique value RandomValue-1234567890.
  • Now foward this to your TargetGroup
  • Now Save it.Image rule2

Update the CloudFront -CDN

  • Goto CloudFront console and select your distribution.
  • Select Orgins and click edit.
  • Under Add custom header – optional
  • Update Header name =X-Custom-Header , Value=RandomValue-1234567890 and click Save

🎉Congratulations🎉 you have successfully secured your load balancer.GIFImage Congratulations

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