Day 6/40

Kubernetes Multi Node Cluster Setup Step By Step - Kind

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There are many ways to install the Kubernetes such as installing with Minikube, MicroK8s, K3s and Kubeadm, but in this section, we're going to install it with Kind cluster.
Read More: Link1, Link2

kind is a tool for running local Kubernetes clusters using Docker container “nodes”.
kind was primarily designed for testing Kubernetes itself, but may be used for local development or CI.

Installation Process

1. Prerequisite

Golang is needed at first

root@localhost:~# apt install golang -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
golang is already the newest version (2:1.18~0ubuntu2).
0 upgraded, 0 newly installed, 0 to remove and 22 not upgraded.

2. Download `kind` on linux

Installation Guid


root@localhost:~# [ $(uname -m) = x86_64 ] && curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.23.0/kind-linux-amd64
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    98  100    98    0     0   1080      0 --:--:-- --:--:-- --:--:--  1088
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 6381k  100 6381k    0     0  6188k      0  0:00:01  0:00:01 --:--:-- 6188k
root@localhost:~# chmod +x kind
root@localhost:~# mv kind /usr/local/bin/kind
root@localhost:~# kind --version
kind version 0.23.0

3. Installing `kubectl`

Installation Guid

root@localhost:~# curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   138  100   138    0     0    752      0 --:--:-- --:--:-- --:--:--   754
100 49.0M  100 49.0M    0     0  53.0M      0 --:--:-- --:--:-- --:--:-- 53.0M
root@localhost:~# curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   138  100   138    0     0    728      0 --:--:-- --:--:-- --:--:--   730
100    64  100    64    0     0    240      0 --:--:-- --:--:-- --:--:--   240
root@localhost:~# echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
kubectl: OK
root@localhost:~# sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
root@localhost:~# kubectl version
Client Version: v1.30.2
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.29.4

4. Creating a Cluster

Please read the Release Notes

root@localhost:~# kind create cluster --image kindest/node:v1.29.4@sha256:3abb816a5b1061fb15c6e9e60856ec40d56b7b52bcea5f5f1350bc6e2320b6f8 --name jolly-jumper
Creating cluster "jolly-jumper" ...
 ✓ Ensuring node image (kindest/node:v1.29.4) 🖼
 ✓ Preparing nodes 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
Set kubectl context to "kind-jolly-jumper"
You can now use your cluster with:

kubectl cluster-info --context kind-jolly-jumper

Thanks for using kind! 😊

root@localhost:~# kubectl cluster-info --context kind-jolly-jumper
Kubernetes control plane is running at https://127.0.0.1:46167
CoreDNS is running at https://127.0.0.1:46167/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

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

5. Interact with the clsuter

root@localhost:~# kind get clusters
jolly-jumper
root@localhost:~# kubectl get nodes
NAME                         STATUS   ROLES           AGE    VERSION
jolly-jumper-control-plane   Ready    control-plane   112s   v1.29.4
root@localhost:~# kubectl config get-contexts
CURRENT   NAME                CLUSTER             AUTHINFO            NAMESPACE
*         kind-jolly-jumper   kind-jolly-jumper   kind-jolly-jumper

6. Configuring a multi-nodes `kind` cluster

yaml file with 3 nodes for instance. Find more

# three node (two workers) cluster config
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker

root@localhost:~# kind create cluster --name lucky-luke --config kind-lucky-luke.yaml
Creating cluster "lucky-luke" ...
 ✓ Ensuring node image (kindest/node:v1.30.0) 🖼
 ✓ Preparing nodes 📦 📦 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
 ✓ Joining worker nodes 🚜
Set kubectl context to "kind-lucky-luke"
You can now use your cluster with:

kubectl cluster-info --context kind-lucky-luke

Not sure what to do next? 😅  Check out https://kind.sigs.k8s.io/docs/user/quick-start/
root@localhost:~# kind get clusters
jolly-jumper
lucky-luke

Note
Important website for exam:

7. Switching between contexts

root@localhost:~# kubectl config get-contexts
CURRENT   NAME                CLUSTER             AUTHINFO            NAMESPACE
          kind-jolly-jumper   kind-jolly-jumper   kind-jolly-jumper
*         kind-lucky-luke     kind-lucky-luke     kind-lucky-luke
root@localhost:~# kubectl config current-context
kind-lucky-luke
root@localhost:~# kubectl get nodes
NAME                       STATUS     ROLES           AGE     VERSION
lucky-luke-control-plane   Ready      control-plane   4m36s   v1.30.0
lucky-luke-worker          NotReady   <none>          3m40s   v1.30.0
lucky-luke-worker2         NotReady   <none>          3m26s   v1.30.0
root@localhost:~# kubectl config use kind-jolly-jumper
Switched to context "kind-jolly-jumper".
root@localhost:~# kubectl get nodes
NAME                         STATUS   ROLES           AGE   VERSION
jolly-jumper-control-plane   Ready    control-plane   10m   v1.29.4

40 Days Of Kubernetes (6/40)