Reference: https://www.youtube.com/watch?v=1xo-0gCVhTU
$ docker run -p 3000:80 tutum/hello-world
or
$ docker run -d -p 3000:80 tutum/hello-world
and then go to localhost:3000, you will see a web page hello world
$ minikube start
$ kubectl get pods //No resources found.
$ kubectl get deployments //No resources found.
$ minikube dashboard
start minikube and show the k8s dashboard GUI
$ kubectl create -f deployment.yml
create exampleservice service and myappdeployment deployment
$ kubectl get pods
There are 5 replicas of myappdeployment (as set in deploymet.yml)
| NAME | READY | STATUS | RESTARTS | AGE |
|---|---|---|---|---|
| hello-world-858c579f6b-54lkv | 1/1 | Running | 0 | 4m27s |
| hello-world-858c579f6b-5lnwz | 1/1 | Running | 0 | 4m27s |
| hello-world-858c579f6b-5tv7c | 1/1 | Running | 0 | 4m27s |
| hello-world-858c579f6b-9tjq5 | 1/1 | Running | 0 | 4m27s |
| hello-world-858c579f6b-b66qq | 1/1 | Running | 0 | 4m27s |
$ kubectl get deployments
| NAME | READY | UP-TO-DATE | AVAILABLE | AGE |
|---|---|---|---|---|
| hello-world | 5/5 | 5 | 5 | 9m54s |
$ minikube ip
get ip address of kubernetes cluster such as 192.168.99.100 and go to 192.168.99.100:30001 (number of port are set in deploymet.yml)
For change the number of replicas Dashboard -> Deployments -> click : on the most right -> Scale If it's increasing replicas, pods will be created. If it's decreasing, available pods will be terminated.
Load-Blancing = balance number of clients of each pods (users access the same deployments)
Reference: https://nodejs.org/en/docs/guides/nodejs-docker-webapp/
1 ) install dependencies
$ npm i express --save
2 ) create deployment-node-app.yml, index.js, Dockerfile, and .dockerignore following the reference
3 ) build and run container
$ docker build -t vittunyuta/k8snodeapp:v1.0.0 .
$ docker run -p 8081:8080 -d vittunyuta/k8snodeapp:v1.0.0
4 ) push to docker hub (login docker first). In this case username is vittunyuta, repository name is k8snodeapp, and tagname is v1.0.0
$ docker push <username>/<repo_name>:<tagname>
5 ) create a deployment and pods on kubernetes
$ kubectl create -f deployment-node-app.yml
6 ) get ip address such as 192.168.99.100
$ minikube ip
7 ) go 192.168.99.100:30005
