Want to get hands-on Kubernetes? — Here we go.
Kubernetes is a popular container orchestration platform. This post is a short summary & reference for getting hands dirty on your local machine — in my case on a macOS.
Since Kubernetes is made for real world production demands there is a special distribution for local machines named Minikube. It runs on a single-node cluster inside a VM.
Prerequites
Make sure you have the following developer tools installed.
- VirtualBox (at the time of writing version 6.0 worked for me)
- homebrew (at the time of writing version 1.9.3)
(on macOS 10.14.2)
Install Minikube
Installation of Minikube is easy as follows
$ brew install kubernetes-cli
...
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.2", GitCommit:"cff46ab41ff0bb44d8584413b598ad8360ec1def", GitTreeState:"clean", BuildDate:"2019-01-13T23:15:13Z", GoVersion:"go1.11.4", Compiler:"gc", Platform:"darwin/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?$ brew cask install minikube
...
🍺 minikube was successfully installed!
Verify Minikube installation
$ minikube start
Starting local Kubernetes v1.13.2 cluster...
...
Everything looks great. Please enjoy minikube!Looking into VirtualBox you should see a running VM “minikube”.
Next lets turn on the dashboard (Kubernetes Web UI) to get some more insights of the running single-node Kubernetes Cluster (yes I know there is not much to see.
$ minikube dashboard
...
Opening http://127.0.0.1:52015/api/v1/namespaces/kube-system/services/http:kubernetes-dashboard:/proxy/ in your default browser...
Test a container deployment
Now that there is a running Kubernetes Cluster lets see how to deploy some simple (good looking 😎) stuff
$ kubectl create deployment grafana-deployment --image=grafana/grafana
deployment.apps/grafana-deployment created$ kubectl get pods
NAME READY STATUS RESTARTS AGE
grafana-deployment-6696c557c6-ktx4s 1/1 Running 0 30s$ kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
grafana-deployment 1/1 1 1 60s
The sample container (grafana) is already running but only accessible by its internal IP address. To make it accessible from outside it must be exposed through a Kubernetes service.
$ kubectl expose deployment grafana-deployment --type=LoadBalancer --port=3000
service/grafana-deployment exposed$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
grafana-deployment LoadBalancer 10.111.177.171 <pending> 3000:30285/TCP 52s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 61m
On Minikube the container deployment now simply can be accessed by
$ minikube service grafana-deployment
Opening kubernetes service default/grafana-deployment in default browser…
With the default admin / admin you are able to start exploring Grafana. e.g. Visualizing some metrics of the TestDB.
Clean up
Do not forget to free resources on your machine
$ minikube stop
Stopping local Kubernetes cluster...
Machine stopped.Summary
With a handful commands a single-node Kubernetes Cluster is up and running. It is the smallest possible Kubernetes installation (Minikube) . Do not run this in production.
This Post is brought to you by enpit.de from our lovely feelgood-workspace.com. Follow us on instagram.com/enpit for more cool 😎 things.
Further information
- https://kubernetes.io/docs/tasks/tools/install-minikube/
- https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-with-homebrew-on-macos
- Kubernetes Web UI Dashboard: https://kubernetes.io/docs/tasks/access-application-cluster/web-ui-dashboard/
- Minikube Tutorial: https://kubernetes.io/docs/tutorials/hello-minikube/
- kubectl Cheet Sheat: https://kubernetes.io/docs/reference/kubectl/cheatsheet/
