Usage in Kubernetes

Running in Kubernetes

You can also use openpgp-ca-restd in Kubernetes.

The OpenPGP CA repository contains kustomizations as /kustomize/ that helps you use the openpgp-ca-restd server in k8s.

To get started with deploying the openpgp-ca-restd server you will need to create a kustomization file:

# kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: openpgp-ca
resources:
  - git@gitlab.com:openpgp-ca/openpgp-ca/kustomize/restd

You will also need to patch in the domain to ensure the CA is properly configured

apiVersion: apps/v1
kind: Deployment
metadata:
  name: openpgp-ca
spec:
  template:
    spec:
      initContainers:
        - name: init
          env:
            - name: DOMAIN
              value: "example.com"

All code is available here.

Exposing to admins

By default openpgp-ca-restd should not be available to the outside world.

When it comes to accessing it as a kuberentes administrator you can simply port-forward but you may want to give someone access to the CA but no give them access to your cluster. With that in mind you can provide openpgp-ca-restd with a domain and protect it with MutualTLS (mtls).

Any MutualTLS provider can work and should integrate with Nginx Ingress Controller pretty seemlessly. In this example we will be using mtls-server. If you’d also like to set up an mtls-server please see the docs there to configure.

# ingress.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: openpgp-ca
  labels:
    app.kubernetes.io/name: openpgp-ca
  annotations:
    kubernetes.io/ingress.class: nginx # Use Nginx Ingress Controller
    cert-manager.io/cluster-issuer: letsencrypt # Get certificate using Cert-Manager
    nginx.ingress.kubernetes.io/auth-tls-verify-client: "on" # Enable mTLS
    nginx.ingress.kubernetes.io/auth-tls-secret: "mtls/mtls-certs" # Location of MTLS Certificate
    nginx.ingress.kubernetes.io/auth-tls-verify-depth: "1"
    nginx.ingress.kubernetes.io/auth-tls-pass-certificate-to-upstream: "false"
spec:
  tls:
    - hosts:
      - openpgp-ca.example.com
      secretName: opepgp-ca-tls
  rules:
    - host: openpgp-ca.example.com
      http:
        paths:
          - path: "/"
            backend:
              serviceName: openpgp-ca
              servicePort: http

All code is available here.