/sample-nodejs-docker-k8s

A trivial example nodejs project that you can use to understand how to dockerize your node application as well as deploy into kubernetes (such as minikube)

This is a simple example nodejs project that you can use to understand how to dockerize your node application as well as deploy into kubernetes (such as minikube)

Eclipse source project:

This folder container nodeclipse assets - so you should be able to import into your eclipse workspace directly & test out against port 3000.

To run it with debug from the command line, using a unique port to avoid conflicts:

node --inspect=4000 --debug-brk app.js

Dockerfile describes how to build the docker image k8s/ has the kubernetes artifacts

Try out the Dockerized node app:

1). To build the docker image

docker build -t nodejs-helloworld:v1 .

2). Start up the container, map port 8000 on the host to port 3000 inside the container

docker run -p 8000:3000 -d nodejs-helloworld:v1

3). Try it out

http://localhost:8000/

Testing with kubernetes/minikube

minikube notes: if you are using minikube - its usually much more convenient to use the docker daemon/registry inside of minikube.

$ eval $(minikube docker-env)

  • would up your env variables to allow your host's docker client to talk to the docker daemon inside minikube

However you may see a version mismatch issue such as:

$ docker ps
Error response from daemon: client is newer than server (client API version: 1.24, server API version: 1.23)

If thats the case, then set the API version env variable appropriately. For example.

export DOCKER_API_VERSION=1.23

Then you can do a docker build etc. against the docker daemon inside minikube.

Important note Just make sure you tag your Docker image with something other than ‘latest’ and use that tag while you pull the image. See: http://kubernetes.io/docs/getting-started-guides/minikube/#reusing-the-docker-daemon

Deploy in minikube:

look at k8s/README.md about changing the ymls and scripts on the location of the docker image to an external registry if you so decide to.
kubectl create -f k8s/deployment.yml

Expose: (using NodePort only for minikube)

kubectl expose deployment  nodejs-helloworl-deployment --type=NodePort

Access:

minikube service nodejs-helloworld-deployment