Customer would like to migrate CLB to NLB/ALB.

Question

A customer would like to migrate CLB to NLB/ALB. (This customer used the persistent connection to EC2 instances so that they are very sensitive to dis- and re-connection of it at bulk size.)

Do we have any recommendation steps or best practice for this?

I just found that below link and pdf file which described *You can shift traffic all at once or you can do a weighted distribution* under "Update DNS Routing with Amazon Route 53." However this is not enough for guiding or instructing them to do.

Blue/Green Deployments on AWS.pdf
(https://d1.awsstatic.com/whitepapers/AWS_Blue_Green_Deployments.pdf)

Accepted Answer

You can use the [Migration Wizard][1] for CLB->ALB/NLB and then gradually shift traffic using weighting ([Step 2][1] in the migration wizard link)

[1]: https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/migrate-to-application-load-balancer.html#migrate-traffic

Customer would like to migrate CLB to NLB/ALB.

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