Point Cloudflare to ECS instances

[Feifan Zhou]

Hi all,

I have an ECS setup in Terraform with the underlying EC2 instances being created by an autoscaling group and launch config. Currently, I just have one instance. Is there a way to get the IP address of that instance and pass it in to a Cloudflare DNS record? Alternatively, what would be a good setup to reverse-proxy the ECS cluster and set a Cloudflare record to that? 

The challenge seems to be that Terraform doesn't have visibility to the underlying EC2 clusters, which have their own public IPs. 

Thanks!

Best,

Feifan

[Clint Shryock]

Hey Feifan –

Even at a scale of 1 instance, I imagine the best way to connect your ECS to Cloudflare would be by introducing an ELB into your setup. This way, Cloudflare records shouldn't need to change, and the ELB handles the routing of requests to the specific instance(s) as the exist at that time. 

Does that make sense? Or is there something that prohibits this approach that I'm unaware of?

Regards,

Clint

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Clint

[Feifan Zhou]

Hi Clint,

Thanks for your reply. Nothing preventing that, although I'm not particularly familiar with ELB … how would I integrate it into my setup?

[Clint Shryock]

It depends on your setup, I suppose. Essentially you create an ELB, and add your ECS instances to it. You forward the necessary port to the port your services are listening to.

Here's the heavy handed guide from AWS:

- http://docs.aws.amazon.com/fr_fr/AmazonECS/latest/developerguide/service-load-balancing.html

Once you have the ELB configured, you can add it to your AutoScaling group's `load_balancers` attribute, which should connect the two.

Sorry I don't have concrete examples for you :(

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Clint

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