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Snowcrash
Asked: 2017-03-16 02:51:21 +0800 CST

AWS - Route to multiple ports on a single instance

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AWS' Application Load Balancer has the feature to Route to multiple ports on a single instance.

Can anyone name a few use cases when you might use this feature?

load-balancing amazon-web-services

2 Answers

  1. Best Answer

    Multiple ports on the same host is critical when using a Docker scheduler such as Amazon EC2 Container Service (ECS), where you don't know beforehand what port #'s will be assigned, on what hosts, and may end up with multiple instances per host.

    For smaller applications it allows you to perform a more graceful rolling update as you can launch the new instance before retiring the prior instance, on the same host.

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  2. Sometimes where webapps are being served there may be additional API services on the same device using a different port. In this case you could use URL redirection within the load balancer so that default/unrouted HTTPS traffic goes straight through to 443 whilst /api/ goes through to 8443 for example. See here for more examples of what can be achieved with listener rules.

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