How to create a kubernetes namespace in an idempotent way with AWS CDK

How can I create a k8s namespace manifest in an idempotent way or ignore the error if the namespace already exist with AWS CDK.

If I create a K8s namespace with a manifest, I regularly get errors that the namespace already exists:

from custom resource. Message returned: Error: b'Error from server (AlreadyExists): error when creating "/tmp/manifest.yaml": namespaces "dev-advanced" already exists\n

Create Manifest:

    def create_namespace(self) -> KubernetesManifest:
        m = self.cluster.add_manifest(
            f"ns_{self.tenant.name}",
            {
                "apiVersion": "v1",
                "kind": "Namespace",
                "metadata": {
                    "name": f"{self.tenant.name}",
                    "labels": {
                        "name": f"{self.tenant.name}"
                    }
                }
            }
        )
        return m

I am facing the same issue and got a solution. Just create a KubernetesManifest, that's the type returned by addManifest, it justs need the option overwrite: true.

I did the following with a manually created namespace and it worked:

const namespace = `test-ns`;

new eks.KubernetesManifest(
    this,
    `${namespace}-namespace`,
    {
        cluster,
        overwrite: true,
        manifest: [
            {
                apiVersion: 'v1',
                kind: 'Namespace',
                metadata: {
                    name: namespace,
                    labels: {
                        name: 'test'
                    }
                },
            },
        ]
    }
);

I had pods running under that namespace and I were worried the namespace would be recreated but all ok.