Kind

Pre-requisite

We will need 1 VM to create a single node kubernetes cluster using kind. We are using following setting for this purpose:

• 1 Linux machine, almalinux-9-x86_64, cpu-su.2 flavor with 2vCPU, 8GB RAM, 20GB storage - also assign Floating IP to this VM.

• setup Unique hostname to the machine using the following command:

  echo "<node_internal_IP> <host_name>" >> /etc/hosts
  hostnamectl set-hostname <host_name>
  

  For example:

  echo "192.168.0.167 kind" >> /etc/hosts
  hostnamectl set-hostname kind
  

Install docker on AlmaLinux

Run the below command on the AlmaLinux VM:

• SSH into kind machine

• Switch to root user: sudo su

• Execute the below command to initialize the cluster:

  Please remove container-tools module that includes stable versions of podman, buildah, skopeo, runc, conmon, etc as well as dependencies and will be removed with the module. If this module is not removed then it will conflict with Docker. Red Hat does recommend Podman on RHEL 8.

  dnf module remove container-tools
  
  dnf update -y
  
  dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
  
  dnf install docker-ce docker-ce-cli containerd.io docker-compose-plugin
  
  systemctl start docker
  systemctl enable --now docker
  systemctl status docker
  
  docker -v
  

Install kubectl on AlmaLinux

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/bin/kubectl
chmod +x /usr/bin/kubectl

• Test to ensure that the kubectl is installed:

  kubectl version --client
  

Install kind

curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.11.1/kind-linux-amd64
chmod +x ./kind
mv ./kind /usr/bin

which kind

/bin/kind

kind version

kind v0.11.1 go1.16.4 linux/amd64

• To communicate with cluster, just give the cluster name as a context in kubectl:

  kind create cluster --name k8s-kind-cluster1
  
  Creating cluster "k8s-kind-cluster1" ...
  ✓ Ensuring node image (kindest/node:v1.21.1) 🖼
  ✓ Preparing nodes 📦
  ✓ Writing configuration 📜
  ✓ Starting control-plane 🕹️
  ✓ Installing CNI 🔌
  ✓ Installing StorageClass 💾
  Set kubectl context to "kind-k8s-kind-cluster1"
  You can now use your cluster with:
  
  kubectl cluster-info --context kind-k8s-kind-cluster1
  
  Have a nice day! 👋
  

• Get the cluster details:

  kubectl cluster-info --context kind-k8s-kind-cluster1
  
  Kubernetes control plane is running at https://127.0.0.1:38646
  CoreDNS is running at https://127.0.0.1:38646/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
  
  To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
  

  kubectl get all
  
  NAME                TYPE       CLUSTER-IP  EXTERNAL-IP  PORT(S)  AGE
  service/kubernetes  ClusterIP  10.96.0.1   <none>       443/TCP  5m25s
  

  kubectl get nodes
  
  NAME                             STATUS  ROLES                AGE    VERSION
  k8s-kind-cluster1-control-plane  Ready  control-plane,master  5m26s  v1.21.1
  

Deleting a Cluster

If you created a cluster with kind create cluster then deleting is equally simple:

kind delete cluster

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