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Kubernetes

Kubernetes In Docker [KInD]

graph LR image([image]) --> |used by|container subgraph pod direction TB container end
graph LR subgraph deployment direction TB subgraph pod container end end

Create a Cluster and look around

  1. Get started

    kind create cluster

    output

    Creating cluster "kind" ...
āœ“ Ensuring node image (kindest/node:v1.25.0) šŸ–¼
āœ“ Preparing nodes šŸ“¦
āœ“ Writing configuration šŸ“œ
āœ“ Starting control-plane šŸ•¹ļø
āœ“ Installing CNI šŸ”Œ
āœ“ Installing StorageClass šŸ’¾
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Have a nice day! šŸ‘‹

  2. standard kubectl commands

    
```text
kubectl cluster-info --context kind-kind

    output

    Kubernetes control plane is running at https://127.0.0.1:56236
CoreDNS is running at https://127.0.0.1:56236/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

    And taking a look at the context

    kubectl config current-context

    output

    kind-kind

Create our first resource

  1. Running things directly

    !!WARN: This is not the recommended way to run things in Kubernetes!!

    kubectl run --image gcr.io/google-containers/busybox mypod

    output

    pod/mypod created

  2. Inspect the pod

    kubectl get pod

    output

    NAME    READY   STATUS             RESTARTS      AGE
mypod   0/1     CrashLoopBackOff   1 (12s ago)   16s

  3. Look at "all" the things

    kubectl get all

    output

    NAME        READY   STATUS             RESTARTS     AGE
pod/mypod   0/1     CrashLoopBackOff   1 (3s ago)   7s

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   13m

From Misc
Go to text ā†’

Alternative ā€” Windows Hyper-V

A Hyper-what-now?

Big words! It's a piece like VMWare, VirtualBox, Hyper-V ā€” which is built into Windows

Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All

output

Path          :
Online        : True
RestartNeeded : False

Install kind

Alternative ā€” Install minikube

  • Follow the instructions in minikube start

  • Download minikube.exe

    New-Item -Path 'c:\' -Name 'minikube' -ItemType Directory -Force
Invoke-WebRequest -OutFile 'c:\minikube\minikube.exe' -Uri 'https://github.com/kubernetes/minikube/releases/latest/download/minikube-windows-amd64.exe' -UseBasicParsing

  • Add the executable to your path

    $oldPath = [Environment]::GetEnvironmentVariable('Path', [EnvironmentVariableTarget]::User)
if ($oldPath.Split(';') -inotcontains 'C:\minikube'){ `
  [Environment]::SetEnvironmentVariable('Path', $('C:\minikube;{0}' -f $oldPath), [EnvironmentVariableTarget]::User) `
}

  • Reload your path. The easiest way is to stop and start your terminal again.

    If you use VS Code do not use Developer: Reload Window. You will need to close and open the full application.

    VS Code Reload Window Command

    The same applies other tools like JetBrains products if you use them.

    Get-Command minikube

    Output

    CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Application     minikube.exe                                       0.0.0.0    C:\minikube\minikube.exe

Children
  1. CPU Limits
  2. Misc
  3. Pod