Configuring a Kubernetes service account to assume an IAM role

• https://docs.aws.amazon.com/eks/latest/userguide/associate-service-account-role.html

cat >trust-relationship.json <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Federated": "arn:aws:iam::$account_id:oidc-provider/$oidc_provider"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "$oidc_provider:aud": "sts.amazonaws.com",
          "$oidc_provider:sub": "system:serviceaccount:$namespace:$service_account"
        }
      }
    }
  ]
}
EOF

aws iam create-role --role-name my-role --assume-role-policy-document file://trust-relationship.json --description "my-role-description"

kubectl describe serviceaccount
Creating an IAM OIDC provider for your EKS cluster

See also

• EKS: IRSA, Module: ebs_csi_irsa_role, enable_irsa
• OIDC, kubectl oidc-login, AWS IAM OIDC, EKS OIDC, EKS module, aws iam list-open-id-connect-providers | aws iam create-open-id-connect-provider | aws iam get-open-id-connect-provider, OIDC tokens, aws_lb_listener_rule
• AWS EKS:AWS::EKS, aws eks [ create-cluster | list-clusters | describe-cluster | update-kubeconfig | list-updates | list-addons | update-cluster-version | update-nodegroup-version | get-token | create-addon ]