Steps

Assume the following steps are done in the folder ./kubernetes, with the needed YAML files in the folder

  1. create secret:

    kubectl create secret generic db-user-pass --from-literal=password=mysecretpass
    kubectl create secret generic db-user --from-literal=username=postgres
    
  2. deploy configmap:

    kubectl create -f db-configmap.yml
    
  3. deploy db-service:

    kubectl create -f db-service.yml
    
  4. deploy redis:

    kubectl create -f redis.yml
    
  5. create secret-key-base:

    kubectl create secret generic secret-key-base --from-literal=secret-key-base=your-desired-key
    
  6. run the setup pod

    kubectl create -f setup.yaml
    
  7. run the rails pod

    kubectl create -f rails.yaml
    
  8. run the ingress pod

    # make sure Ingress enabled
    minikube addons enable ingress
    
    # then start the ingress
    kubectl create -f ingress.yaml
    
  9. (optional) the sidekiq pod

    kubectl create -f sidekiq.yaml # note that I didn't do this locally
    

Resources

Blog Post:

  • Rails on Kubernetes: it describes what’s needed clearly. Here’s what it describes:
    • Postgres: the DB service, which is composed of
      • Service: ingress -> pods, default to use ClusterIP
      • Secret: stores sensitive information
      • Persistent Volume (PV): persistent disk space, cuz pod is ephemeral
      • Persistent Volume Claim (PVC): binds resource to Pod
      • Replication Controller (RC): controls lifecycle of Pod
    • Redis: the Cache

Comamnds

Here I take note of some Kubernetes commands:

# get all resources, including all namespace
kubectl get all --namespace

## About Pods ##
# query pods with list of labels
kubectl get pods -l environment=production,tier=frontend
#
# watch pod status, live
kubectl get pods -w