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Configure TLS/SSL for VaultServer

KubeVault provides support for TLS/SSL for VaultServer. This tutorial will show you how to use KubeVault to deploy a VaultServer with TLS/SSL configuration.

Before You Begin

• At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.

• Install cert-manger v1.4.0 or later to your cluster to manage your SSL/TLS certificates.

• Install KubeVault operator in your cluster following the steps here.

• To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial.

    $ kubectl create ns demo
    namespace/demo created
  

Deploy VaultServer with TLS/SSL configuration

As pre-requisite, at first, we are going to create an Issuer/ClusterIssuer. This Issuer/ClusterIssuer is used to create certificates. Then we are going to deploy a VaultServer with TLS/SSL configuration.

Create Issuer/ClusterIssuer

Now, we are going to create an example Issuer that will be used throughout the duration of this tutorial. Alternatively, you can follow this cert-manager tutorial to create your own Issuer. By following the below steps, we are going to create our desired issuer,

• Start off by generating our ca-certificates using openssl,

$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./ca.key -out ./ca.crt -subj "/CN=vault/O=kubevault"

• create a secret using the certificate files we have just generated,

$ kubectl create secret tls vault-ca --cert=ca.crt  --key=ca.key --namespace=demo 
secret/vault-ca created

Now, we are going to create an Issuer using the vault-ca secret that contains the ca-certificate we have just created. Below is the YAML of the Issuer cr that we are going to create,

apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
 name: vault-issuer
 namespace: demo
spec:
 ca:
   secretName: vault-ca

Let’s create the Issuer cr we have shown above,

$ kubectl apply -f issuer.yaml
issuer.cert-manager.io/vault-issuer created

Deploy VaultServer with TLS/SSL configuration

Here, our issuer vault-issuer is ready to deploy a VaultServer Cluster with TLS/SSL configuration. Below is the YAML for VaultServer that we are going to create,

apiVersion: kubevault.com/v1alpha2
kind: VaultServer
metadata:
  name: vault
  namespace: demo
spec:
  tls:
    issuerRef:
      apiGroup: "cert-manager.io"
      kind: Issuer
      name: vault-issuer
  allowedSecretEngines:
    namespaces:
      from: All
    secretEngines:
      - mysql
  version: 1.10.3
  replicas: 3
  backend:
    raft:
      storage:
        storageClassName: "standard"
        resources:
          requests:
            storage: 1Gi
  unsealer:
    secretShares: 5
    secretThreshold: 3
    mode:
      kubernetesSecret:
        secretName: vault-keys
  monitor:
    agent: prometheus.io
    prometheus:
      exporter:
        resources: {}
  terminationPolicy: DoNotTerminate

Here,

• spec.tls.issuerRef refers to the vault-issuer issuer.