Add information on regional STS endpoints for IRSA #337
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IRSA in a private cluster requires the use of STS VPC endpoints. However, the most AWS SDKs use the global STS endpoint by default for the STS `AssumeRoleWithWebIdentity` call, which bypasses the STS VPC endpoint (and fails in a private cluster).
To make this work correctly, we may need to explicitly instruct the SDK to use the regional STS endpoint. Usually this is done by passing some environment variables:
```yaml
- env:
- name: AWS_REGION
value: <REGION>
- name: AWS_STS_REGIONAL_ENDPOINTS
value: regional
```
Relevant info:
aws/amazon-eks-pod-identity-webhook#55 (Note: `eks.amazonaws.com/sts-regional-endpoints` doesn't appear to be supported yet in EKS)
https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_sts_vpce.html#id_credentials_sts_vpce_create
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Issue #, if available:
N/A
Description of changes:
IRSA in a private cluster requires the use of STS VPC endpoints. However, most AWS SDKs use the global STS endpoint by default for the STS
AssumeRoleWithWebIdentitycall, which bypasses the STS VPC endpoint (and hence fails in a private cluster).To make this work correctly, we may need to explicitly instruct the SDK to use the regional STS endpoint. Usually this is done by passing some environment variables to the container/pod:
Relevant info:
aws/amazon-eks-pod-identity-webhook#55 (Note:
eks.amazonaws.com/sts-regional-endpointsdoesn't appear to be supported yet in EKS)https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_sts_vpce.html#id_credentials_sts_vpce_create
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