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So after much time trying to get an AWS ECS cluster to recognize my instances, I realized it was the because the cluster was in the default cluster for the account while the instances were in a custom VPC. I am able to get my instances registered with the cluster if I use the default VPC instead of the one I created so I know that's not the problem.

How do I specify that the cluster is in a created VPC rather than the default? Basically, I want my instances in "VPC-x" to get recognized/registered by the ECS cluster. Is that even possible?

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  • Clusters aren't associated with a VPC. This sounds like a networking issue. Do you assign public IPs to the instances in your VPC? If not, does the VPC have a NAT instance or gateway?
    – Karen B
    Jul 13, 2016 at 5:44
  • I did assign public IPs. Like I said, I created the exact same instance with the exception of the VPC it was in. The instance in the default VPC was discovered by the cluster, the other was not discovered.
    – Tim Martin
    Jul 13, 2016 at 14:32

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