09. Kubernetes

KinD Kubernetes Cluster Setup

Install Docker and KinD on your local machine.

Before Install KinD, I need Install GO:

 wget https://go.dev/dl/go1.21.3.linux-amd64.tar.gz
    4  mkdir -p $HOME/go/{bin,src}
    5  cd
    6  ls -la
    7  nano .profile
    8  cd /home
    9  tar -xvf go1.21.3.linux-amd64.tar.gz
   10  mv go /usr/local/
   11  cd
   12  . ~/.profile
   13  go version

 go version
go version go1.21.3 linux/amd64

After that I can install KinD:

 14  go install sigs.k8s.io/kind@v0.20.0

kind version
kind v0.20.0 go1.21.3 linux/amd64

###Create a KinD cluster with a single control plane node. This is where I had an error on step ✓ Preparing nodes 📦 ERROR: failed to create cluster: failed to init node with kubeadm: command "docker exec --privileged kind-control-plane kubeadm init --skip-phases=preflight --config=/kind/kubeadm.conf --skip-token-print --v=6" failed with error: exit status 1 I found solution in ofitial website/ I han cgroup.v2. But I need cgroup.v1

nano /etc/default/grub
sudo update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.10.0-26-amd64
Found initrd image: /boot/initrd.img-5.10.0-26-amd64
Found linux image: /boot/vmlinuz-5.10.0-18-amd64
Found initrd image: /boot/initrd.img-5.10.0-18-amd64
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot                                                                                                              entries.
done
 docker info | grep Cgroup
 Cgroup Driver: cgroupfs
 Cgroup Version: 1

Create cluster:

kind create cluster
Creating cluster "kind" ...
 ✓ Ensuring node image (kindest/node:v1.27.3) 🖼
 ✓ Preparing nodes 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Have a nice day! 👋

Verify that the cluster is up and running using kubectl.

Before verifying I need to install kubectl:

  56  curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
  57  sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

After than I can use him:

kubectl version --client
Client Version: v1.28.3
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
➜  09.Kubernetes kubectl get nodes
NAME                 STATUS   ROLES           AGE   VERSION
kind-control-plane   Ready    control-plane   15m   v1.27.3
➜  09.Kubernetes kubectl get pods -A
NAMESPACE            NAME                                         READY   STATUS    RESTARTS   AGE
kube-system          coredns-5d78c9869d-8q8g6                     1/1     Running   0          15m
kube-system          coredns-5d78c9869d-j7qz6                     1/1     Running   0          15m
kube-system          etcd-kind-control-plane                      1/1     Running   0          15m
kube-system          kindnet-mdjsv                                1/1     Running   0          15m
kube-system          kube-apiserver-kind-control-plane            1/1     Running   0          15m
kube-system          kube-controller-manager-kind-control-plane   1/1     Running   0          15m
kube-system          kube-proxy-jqdsp                             1/1     Running   0          15m
kube-system          kube-scheduler-kind-control-plane            1/1     Running   0          15m
local-path-storage   local-path-provisioner-6bc4bddd6b-xgp7f      1/1     Running   0          14m

Minikube Kubernetes Cluster Setup

Situation. All this time I was working on a VM on Proxmox, which is used as the main OS at work (I can do my homework at work and at home). It was Debian. I added the CPU and RAM for the Minikube and installed it. Before this I also installed Virtualbox, but it complained that there was no graphical interface and cursed. In general, I tried to install a Minikube cluster with a driver from Virtualbox. I checked that even the machine has Intel virtualization. Everything should work, but after trying to create a cluster, the machine does not work at all. I can't even turn it off. It hangs on the login and reboots itself and does not respond to any commands. Therefore, I created a new machine and installed KinD on it all over again. And I already installed Minikube on my home laptop on Windows, which is why I provide screenshots of the installation and verification of the Minikube cluster.

GitHub Actions for KinD Cluster Setup

Created a GitHub repository for your Kubernetes-related assignments

->Click here <-

Wrote a GitHub Actions workflow that sets up a KinD cluster.

KinD-action.yaml

name: Setup KinD Cluster

on:
  push:
    branches:
      - master

jobs:
  setup_kind:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout Code
      uses: actions/checkout@v4

    - name: Start Kind
      id: start_time_kind
      run: |
        echo "start_kind=$(date '+%s')" >> $GITHUB_OUTPUT
    - name: Setup KinD
      run: |
        curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.20.0/kind-linux-amd64
        chmod +x ./kind
        sudo mv ./kind /usr/local/bin/kind
        kind create cluster
        
    - name: Setup kubectl
      run: |
        curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
        sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
    
#    - name: Setup KinD with reaydy action
#      uses: helm/kind-action@v1.5.0

    - name: End KinD
      id: end_time_kind
      run: |
        echo "end_kind=$(date '+%s')" >> $GITHUB_OUTPUT
  
    - name: Extract Cluster Info
      run: |
        kubectlversion=$(kubectl version)
        kindversion=$(kind version)
        pods=$(kubectl get pods -A)
        nodes=$(kind get nodes --name kind)
        echo "kubectl Version: $kubectlversion" > kind-cluster-info.txt
        echo "KinD Version: $kindversion" >> kind-cluster-info.txt
        echo "Pods: $pods" >> kind-cluster-info.txt
        echo "Nodes: $nodes" >> kind-cluster-info.txt
        echo "How long spin up (Time): $((${{steps.end_time_kind.outputs.end_kind}} - ${{steps.start_time_kind.outputs.start_kind}})) seconds"  >> kind-cluster-info.txt
      shell: bash

    - name: Upload KinD Info
      uses: actions/upload-artifact@v3
      with:
        name: kind-cluster-info
        path: kind-cluster-info.txt

    - name: Cleanup KinD Cluster
      run: |
        kind delete cluster

I used two methods of installing the KinD cluster, through the action and through the commands that are indicated on the official website and came to the conclusion that it is better to use the second option, because this installs the latest version and is a little faster.

Artifact

kind-cluster-info.txt

kubectl Version: Client Version: v1.28.3
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.27.3

KinD Version: kind v0.20.0 go1.20.4 linux/amd64

Pods: 
NAMESPACE     NAME                                         READY   STATUS    RESTARTS   AGE
kube-system   etcd-kind-control-plane                             1/1   Running     0          4s
kube-system   kube-apiserver-kind-control-plane                   1/1   Running     0          7s
skube-system   kube-controller-manager-kind-control-plane         0/1   Running     0          6s
kube-system   kube-scheduler-kind-control-plane                   0/1   Running     0          4s

Nodes: kind-control-plane

How long spin up (Time): 52 seconds

IPaul32/09.Kubernetes