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Using Cert-manager + rout53 With Kiam

Posted at — Sep 10, 2020

As described here: https://cert-manager.io/docs/configuration/acme/dns01/route53/#set-up-an-iam-role, First you need to create a role, for example `dns-manager`.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "route53:GetChange",
      "Resource": "arn:aws:route53:::change/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "route53:ChangeResourceRecordSets",
        "route53:ListResourceRecordSets"
      ],
      "Resource": "arn:aws:route53:::hostedzone/*"
    },
    {
      "Effect": "Allow",
      "Action": "route53:ListHostedZonesByName",
      "Resource": "*"
    }
  ]
}

You can replace the * in arn:aws:route53:::hostedzone/* with a specific zone id.

Use cert-manager with out kiam

If you didn't use kiam, you just need to allow the instance(role) to assume this role. Attach this policy to the instance role

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "AWS": <role-arn>
      },
      "Effect": "Allow"
    }
  ]
}

Replace the <role-arn> to the instance role.

And then define a ClusterIssuer , and tell the issuer to assume this role to manage the zone.

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    .... other options
    - selector:
        dnsZones:
          - "example.com"
      dns01:
        route53:
          region: us-east-1
          hostedZoneID: DIKER8JEXAMPLE # optional, see policy above
          role: arn:aws:iam::YYYYYYYYYYYY:role/dns-manager

Use cert-manager with kiam

You need to get kiam work first. And then We need to allow kiam server to assume the dns-manager role. Attach this policy to kiam server role.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "AWS": <role-arn>
      },
      "Effect": "Allow"
    }
  ]
}

Replace the <role-arn> to kiam server role arn.

Define a ClusterIssuer , this time we didn't need to assume the role to get it work.

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    .... other options
    - selector:
        dnsZones:
          - "example.com"
      dns01:
        route53:
          region: us-east-1
          hostedZoneID: DIKER8JEXAMPLE # optional, see policy above

But we need to add an annotation to cert-manager pod.

iam.amazonaws.com/role: <role-arn>

Replace the <role-arn> to the role arn of dns-manager .

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