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Starting Minikube to Create a Cluster

  • The folks behind Minikube made creating a cluster as easy as it can get. All we need to do is to execute a single command. Minikube will start a virtual machine locally and deploy the necessary Kubernetes components into it. The VM will get configured with Docker and Kubernetes via a single binary called localkube.
minikube start --vm-driver=virtualbox

A Note to Windows Users

You might experience problems with VirtualBox. If that’s the case, you might want to use Hyper-V instead.

  • Open a Powershell Admin Window and execute the Get-NetAdapter command, noting the name of your network connection.
  • Create a hyperv virtual switch New-VMSwitch -name NonDockerSwitch -NetAdapterName Ethernet -AllowManagementOS $True replacing Ethernet with your network connection name.
  • Then, create the Minikube vm: `minikube start –vm-driver=hyperv –hyperv-virtual-switch “NonDockerSwitch” –memory=4096.

Other minikube commands such as ,minikube start ,minikube stop , minikube delete all work the same whether you’re using VirutalBox or Hyper- V. A few moments later, a new Minikube VM will be created and set up, and a cluster will be ready for use.

Understanding the Process

  • When we executed the command, it created a new VM based on the Minikube image. That image contains a few binaries. It has both Docker and rkt container engines as well as localkube library.

  • rkt is an application container engine developed for modern production cloud-native environments.

  • The localkube library includes all the components necessary for running Kubernetes. We’ll go into details of all those components later. For now, the important thing is that localkube provides everything we need to run a Kubernetes cluster locally.

Minikube simplified architecture

Remember that this is a single-node cluster running locally on our machine only. While that is unfortunate, it is still the easiest way to “play” with Kubernetes locally. It should do, for now. Later on, we’ll explore ways to create a multi-node cluster that will be much closer to a production setup.

Verfication

Let’s take a look at the status of the cluster.

minikube status  

Minikube is running, and it initialized a Kubernetes cluster. It even configured kubectl so that it points to the newly created VM.

Exploring the Kubernetes Dashboard

You won’t see much UI in this labs. We believe that a terminal is the best way to operate a cluster. More importantly, we are convinced that one should master a tool through its commands first. Later on, once we feel comfortable and understand how the tool works, we can choose to use a UI on top of it. We’ll explore the Kubernetes UI in one of the later labs. For now, you can have a quick glimpse of it.

minikube dashboard

Feel free to explore the UI but don’t take too long. You’ll only get confused with concepts that we did not yet study. Once we learn about pods, replica- sets, services, and a myriad of other Kubernetes components, the UI will start making much more sense.