Hey everyone!
I wrote this quick guide to help you to get started with k8s in 10 min.
In this guide, I show you how to spin a quick Node.js server in Kubernetes and to grasp some of its main concepts. Here is the source code.
Install kubectl
First, you will need to install kubectl in your machine.
Make sure you have all the auths right; for instance, I do the following:
- Create an auth token and move to
~/.kube - Create a config file and move to
~/.kube
Spinning up a Hello World node server in docker
Download this code and build the image:
$ make build:
Now, just run the container:
$ make run
Which is:
docker build -t node_app_test .
Check whether the server is up:
$ make curl
Voilà!
You can also check the status of your setup with:
$ make status
Other useful Docker commands
Exec inside the container:
$ docker exec -i -t <container name from status> /bin/bash
Check images in disk:
$ docker images
Pushing the Registry to Kubernetes
In a real production system, we’ll want to build images in one place, then run these images in the Kubernetes cluster.
The system that images for distribution is called a container registry.
Using a yaml Kubernetes files (for example, the one inside node_server_example/), you can now deploy the image with:
$ kubectl create -f node_example_kube_config.yaml
After that, you are able to create the service with:
$ kubectl expose deployment node-app-test
Also, check out the service status with:
$ kubectl get services
Clean up
Removing the service and the deployment when you are done:
$ kubectl delete service node-app-test
$ kubectl delete deployment node-app-test
Useful General Commands
Checking out pods:
$ kubectl get pods --namespace=<ns-name>
Checking deployments:
$ kubectl get deployments --namespace=<ns-name>
Checking services:
$ kubectl get services --namespace=<ns-name>
Get more information about a pod:
$ kubectl describe pod --namespace=<ns-name> <pod name>