Add a custom TLS certificate

04/25/2022 Contributors

You can remove the existing self-signed TLS certificate and replace it with a TLS certificate signed by a Certificate Authority (CA).

What you'll need

Kubernetes cluster with Astra Control Center installed
Administrative access to a command shell on the cluster to run kubectl commands
Private key and certificate files from the CA

Remove the self-signed certificate

Remove the existing self-signed TLS certificate.

Using SSH, log in to the Kubernetes cluster that hosts Astra Control Center as an administrative user.
Find the TLS secret associated with the current certificate using the following command, replacing <ACC-deployment-namespace> with the Astra Control Center deployment namespace:
```
kubectl get certificate -n <ACC-deployment-namespace>
```

Delete the currently installed secret and certificate using the following commands:

kubectl delete cert cert-manager-certificates -n <ACC-deployment-namespace>
kubectl delete secret secure-testing-cert -n <ACC-deployment-namespace>

Add a new certificate

Add a new TLS certificate that is signed by a CA.

Use the following command to create the new TLS secret with the private key and certificate files from the CA, replacing the arguments in brackets <> with the appropriate information:
```
kubectl create secret tls <secret-name> --key <private-key-filename> --cert <certificate-filename> -n <ACC-deployment-namespace>
```
Use the following command and example to edit the cluster Custom Resource Definition (CRD) file and change the spec.selfSigned value to spec.ca.secretName to refer to the TLS secret you created earlier:
```
kubectl edit clusterissuers.cert-manager.io/cert-manager-certificates -n <ACC-deployment-namespace>
....

#spec:
#  selfSigned: {}

spec:
  ca:
    secretName: <secret-name>
```

Use the following command and example output to validate that the changes are correct and the cluster is ready to validate certificates, replacing <ACC-deployment-namespace> with the Astra Control Center deployment namespace:

kubectl describe clusterissuers.cert-manager.io/cert-manager-certificates -n <ACC-deployment-namespace>
....

Status:
  Conditions:
    Last Transition Time:  2021-07-01T23:50:27Z
    Message:               Signing CA verified
    Reason:                KeyPairVerified
    Status:                True
    Type:                  Ready
Events:                    <none>

Create the certificate.yaml file using the following example, replacing the placeholder values in brackets <> with appropriate information:

apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: <certificate-name>
  namespace: <ACC-deployment-namespace>
spec:
  secretName: <certificate-secret-name>
  duration: 2160h # 90d
  renewBefore: 360h # 15d
  dnsNames:
  - <astra.dnsname.example.com> #Replace with the correct Astra Control Center DNS address
  issuerRef:
    kind: ClusterIssuer
    name: cert-manager-certificates

Create the certificate using the following command:
```
kubectl apply -f certificate.yaml
```

Using the following command and example output, validate that the certificate has been created correctly and with the arguments you specified during creation (such as name, duration, renewal deadline, and DNS names).

kubectl describe certificate -n <ACC-deployment-namespace>
....

Spec:
  Dns Names:
    astra.example.com
  Duration:  125h0m0s
  Issuer Ref:
    Kind:        ClusterIssuer
    Name:        cert-manager-certificates
  Renew Before:  61h0m0s
  Secret Name:   <certificate-secret-name>
Status:
  Conditions:
    Last Transition Time:  2021-07-02T00:45:41Z
    Message:               Certificate is up to date and has not expired
    Reason:                Ready
    Status:                True
    Type:                  Ready
  Not After:               2021-07-07T05:45:41Z
  Not Before:              2021-07-02T00:45:41Z
  Renewal Time:            2021-07-04T16:45:41Z
  Revision:                1
Events:                    <none>

Edit the ingress CRD TLS option to point to your new certificate secret using the following command and example, replacing the placeholder values in brackets <> with appropriate information:

kubectl edit ingressroutes.traefik.containo.us -n <ACC-deployment-namespace>
....

# tls:
#    options:
#      name: default
#    secretName: secure-testing-cert
#    store:
#      name: default

 tls:
    options:
      name: default
    secretName: <certificate-secret-name>
    store:
      name: default

Using a web browser, browse to the deployment IP address of Astra Control Center.
Verify that the certificate details match the details of the certificate you installed.
Export the certificate and import the result into the certificate manager in your web browser.

Add a custom TLS certificate

Creating your file...

Remove the self-signed certificate

Add a new certificate