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Be Happy!

Rails with Docker cheat sheet


rails new command with docker

$ docker run --rm -v $(pwd):/app bitnami/rails:latest rails new my_app --database mysql
https://docs.bitnami.com/kubernetes/how-to/deploy-rails-application-kubernetes-helm/

minikube version
minikube start
kubectl version
kubectl cluster-info
kubectl get nodes
kubectl get deployments
kubectl run kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1 --port=8080

kubectl proxy
curl http://localhost:8001/version

export POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
echo Name of the Pod: $POD_NAME
echo $POD_NAME
hello-node-7657b78bd9-m66kh kubernetes-bootcamp-b94cb9bff-65rqg nginx-deployment-6dd86d77d-ffzp9 nginx-deployment-6dd86d77d-zk95r

curl http://localhost:8001/api/v1/namespaces/default/pods/$POD_NAME/proxy/


$ kubectl get pods
NAME                                  READY   STATUS             RESTARTS   AGE
hello-node-7657b78bd9-m66kh           0/1     CrashLoopBackOff   1967       62d
kubernetes-bootcamp-b94cb9bff-65rqg   1/1     Running            0          66m
nginx-deployment-6dd86d77d-ffzp9      1/1     Running            2          62d
nginx-deployment-6dd86d77d-zk95r      1/1     Running            2          62d

helm install

$ brew install kubernetes-helm
https://matthewpalmer.net/kubernetes-app-developer/articles/how-to-install-helm-mac.html
$ helm create my-rails-app
$ cd my-rails-app

$ kubectl create secret generic db-user-pass --from-literal=password=mysecretpass
secret/db-user-pass created
$ kubectl create secret generic db-user --from-literal=username=postgres
secret/db-user created

$ kubectl create -f postgres.yaml

$ kubectl get pods -w
NAME             READY   STATUS    RESTARTS   AGE
postgres-47mxp   1/1     Running   0          11m

Read

https://docs.bitnami.com/kubernetes/how-to/deploy-rails-application-kubernetes-helm/
https://blog.cosmocloud.co/rails-on-kubernetes-part-2/
https://github.com/tzumby/rails-on-kubernetes
https://kubernetes.io/docs/concepts/overview/working-with-objects/kubernetes-objects/
https://kubernetes.io/ko/docs/reference/kubectl/cheatsheet/
https://cheatsheet.dennyzhang.com/cheatsheet-minikube-a4

kubernetes architecture - service, pod, deployment, node

Google Container Registry (GCR)
https://cloud.google.com/container-registry/
https://cloud.google.com/container-registry/docs/quickstart
$ gcloud auth configure-docker
The following settings will be added to your Docker config file 
located at [/Users/rhee/.docker/config.json]:
 {
  "credHelpers": {
    "gcr.io": "gcloud", 
    "us.gcr.io": "gcloud", 
    "eu.gcr.io": "gcloud", 
    "asia.gcr.io": "gcloud", 
    "staging-k8s.gcr.io": "gcloud", 
    "marketplace.gcr.io": "gcloud"
  }
}

Do you want to continue (Y/n)?  Y

Docker configuration file updated.


Updates are available for some Cloud SDK components.  To install them,
please run:
  $ gcloud components update



To take a quick anonymous survey, run:
  $ gcloud alpha survey

$ docker tag quickstart-image gcr.io/[PROJECT-ID]/quickstart-image:tag1

Docker push


docker.io
docker tag tzumby/rails-app:latest x1wins/rails-app:latest
docker push x1wins/rails-app:latest

google container registry gcr
docker tag tzumby/rails-app:latest gcr.io/[project_id]/rails-app:latest
gcloud docker -- push gcr.io/[project_id]/rails-app:latest
#kubernetes (1) #docker (20) #rails (32)
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