Managing Directories Demo

  • In this demo, there is the k8s root directory.

  • Under that directory are the api, cache and db directories.

  • The api directory contains:

    • api-depl.yaml

    • api-service.yaml

  • The cache directory contains:

    • redis-config.yaml

    • redis-depl.yaml

    • redis-service.yaml

  • The db directory contains:

    • db-config.yaml

    • db-depl.yaml

    • db-service.yaml

  • The db is a mongo database.

  • In the cache directory there is a ClusterIP service, ConfigMap etc.

  • Without Kustomisation, we’d have to go into each directory and run kubectl apply -f k8s/<DIRECTORY_NAME>

    • Can do everything in one line actually using kubectl apply -f k8s/db -f k8s/cache -f k8s/api

  • The above process is cumbersome.

    • Delete all of the above with kubectl delete -f k8s/db -f k8s/cache -f k8s/api

  • We create a kustomization.yaml file with the following:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

resources:
  - api/api-depl.yaml
  - api/api-service.yaml
  - cache/redis-config.yaml
  - cache/redis-depl.yaml
  - cache/redis-service.yaml
  - db/db-config.yaml
  - db/db-depl.yaml
  - db/db-service.yaml

  • Then run kustomize build k8s/ and print out what the final Kubernetes manifests will look like.

    * It just shows you what it will create - it does not apply anything to the actual Kubernetes cluster.

  • To apply it to the cluster, need to run kustomize build k8s/ | kubectl apply -f -

  • It then applies everything to the Kubernetes cluster.

  • Then check with kubectl get pods.

  • Now we want kustomization.yaml files in each directory. This would look like this:

  • In each sub-directory you apply a kustomization.yaml file like so: 
    apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
  • Then in the api directory for example, we input all files that reside in there: ``` apiVersion: kustomize.config.k8s.io/v1beta1 kind: Kustomization

resources:

  • api-depl.yaml

  • api-service.yaml ```

  • You do the same thing for each sub-directory.

  • Then in the root kustomization directory, that kustomization.yaml file has the following:
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

resources:
  - api/
  - cache/
  - db/
  • Then to deploy you just run the command from above or kubectl apply -k k8s/

Updated: