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Which IP addresses should you use to allowlist traffic from your application to other third-party services?

To allowlist traffic that originates from your Argonaut K8s cluster to external applications or services, you can provide the elastic IP (EIP) address of your NAT gateway. You can look for it using the following steps:

  1. Open the Amazon Elastic Compute Cloud (Amazon EC2) console.
  2. Under Network & Security, choose Elastic IPs.
  3. To look for the NAT gateway of your cluster, look for the row whose tags are the following:
    1. A key: http://kubernetes.io/cluster/{cluster-name}
    2. A value: tools/ingress-nginx-controller
  4. For the matching row, copy the value under the Allocated IPv4 address
  5. This is the elastic IP address of your NAT gateway that you need to allowlist