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Using Self-Signed SSL Certs (Kubernetes Deployments)

This page details the optional steps that you can take to use self-signed SSL Certificates in a Kubernetes Deployment of Cinchy.

This process needs to be followed after running the devops.automations script during your initial deployment, as well as each additional time that you run the script (Ex: updating your Cinchy platform), since it will wipe out all of the custom configuration you set up to use a self-signed certificate.

Generate the self-signed certificate by executing the following commands in any folder:

openssl genrsa -des3 -out rootCA.key 4096

openssl req -x509 -new -nodes -key rootCA.key -sha256 -days 1024 -out rootCA.crt

openssl genrsa -out mydomain.com.key 2048

openssl req -new -sha256 -key mydomain.com.key -subj "/C=US/ST=CA/O=MyOrg, Inc./CN=mydomain.com " -out mydomain.com.csr

2. Create a yaml file located at cinchy.kubernetes/platform_components/base/self-signed-ssl-root-ca.yaml.

3. Add the following to the yaml file:

apiVersion: v1
kind: ConfigMap
metadata:
  name: self-signed-ca-pemstore
data:
  rootCA.crt: |
    <rootCA.crt>

4. Add the self signed root CA cert file to the cinchy.kubernetes/environment_kustomizations/cinchy_nonprod/base folder.

5. Add the yaml code snippet to the cinchy.kubernetes/environment_kustomizations/cinchy_nonprod/base/kustomization.yaml file, changing the below files key value as per your root ca cert file name:

configMapGenerator:
- name: self-signed-ca-pemstore
  behavior: replace
  files:
  - rootCA.crt

6. Add the following line to the cinchy.kubernetes/platform_components/base/kustomization.yaml file

- self-signed-ssl-root-ca.yaml

7. Add the below Deployment patchesJson6902 to each of your cinchy.kubernetes/environment_kustomizations/cinchy_nonprod/ENV_NAME/PLATFORM_COMPONENT_NAME/kustomization.yaml files, except "base".

Ensure that the rootCA.crt file name is matched with ConfigMap data, configMapGenerator files, and the patch subpath.

    - op: add
      path: /spec/template/spec/volumes/-
      value: 
        configMap:
          name: self-signed-ca-pemstore
        name: self-signed-ca-pemstore  
    - op: add
      path: /spec/template/spec/containers/0/volumeMounts/-
      value: 
        mountPath: /etc/ssl/certs/rootCA.crt
        name: self-signed-ca-pemstore
        subPath: rootCA.crt

8. Once the changes are deployed, verify the root CA cert is available on the pod under /etc/ssl/certs with below command, inputing your own POD_NAME and NAMESPACE where noted:

 kubectl exec -it POD_NAME -n NAMESPACE -- openssl x509 -in /etc/ssl/certs/rootCA.crt -text

For further reference material, click here.