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Unni P
Unni P

Posted on • Originally published at iamunnip.hashnode.dev

kind - Creating Clusters using Configuration File - Part 3

#opensource #docker #kubernetes #devops

In this article we will look how we can configure our kind cluster in a declarative way

Introduction

  • kind cluster can be created and configured in a declarative way

  • We can define our desired state for kind cluster in a YAML file

  • YAML file follows Kubernetes conventions and versioning

  • Parameters passed in the CLI take precedence over their equivalent in the config file

Usage

Simple Cluster

Creating a simple cluster having one control plane and two worker nodes

$ cat kind.yml apiVersion: kind.x-k8s.io/v1alpha4 kind: Cluster name: dev nodes: - role: control-plane - role: worker - role: worker
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$ kind create cluster --config kind.yml Creating cluster "dev" ... ✓ Ensuring node image (kindest/node:v1.26.3) 🖼 ✓ Preparing nodes 📦 📦 📦 ✓ Writing configuration 📜 ✓ Starting control-plane 🕹️ ✓ Installing CNI 🔌 ✓ Installing StorageClass 💾 ✓ Joining worker nodes 🚜 Set kubectl context to "kind-dev" You can now use your cluster with: kubectl cluster-info --context kind-dev
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$ kubectl get nodes NAME STATUS ROLES AGE VERSION dev-control-plane Ready control-plane 53s v1.26.3 dev-worker Ready <none> 16s v1.26.3 dev-worker2 Ready <none> 29s v1.26.3
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HA Cluster

Creating a cluster having multiple control planes for high availability

$ cat kind.yml apiVersion: kind.x-k8s.io/v1alpha4 kind: Cluster name: dev nodes: - role: control-plane - role: control-plane - role: control-plane - role: worker - role: worker - role: worker
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$ kind create cluster --config kind.yml Creating cluster "dev" ... ✓ Ensuring node image (kindest/node:v1.26.3) 🖼 ✓ Preparing nodes 📦 📦 📦 📦 📦 📦 ✓ Configuring the external load balancer ⚖️ ✓ Writing configuration 📜 ✓ Starting control-plane 🕹️ ✓ Installing CNI 🔌 ✓ Installing StorageClass 💾 ✓ Joining more control-plane nodes 🎮 ✓ Joining worker nodes 🚜 Set kubectl context to "kind-dev" You can now use your cluster with: kubectl cluster-info --context kind-dev
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$ kubectl get nodes NAME STATUS ROLES AGE VERSION dev-control-plane Ready control-plane 2m32s v1.26.3 dev-control-plane2 Ready control-plane 2m18s v1.26.3 dev-control-plane3 Ready control-plane 74s v1.26.3 dev-worker Ready <none> 56s v1.26.3 dev-worker2 Ready <none> 56s v1.26.3 dev-worker3 Ready <none> 68s v1.26.3
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Changing Kubernetes Version

We can change the Kubernetes version by setting the node’s container image and it’s mandatory to include the sha256 value with the image

$ cat kind.yml apiVersion: kind.x-k8s.io/v1alpha4 kind: Cluster name: dev nodes: - role: control-plane image: kindest/node:v1.27.0@sha256:c6b22e613523b1af67d4bc8a0c38a4c3ea3a2b8fbc5b367ae36345c9cb844518 - role: worker image: kindest/node:v1.27.0@sha256:c6b22e613523b1af67d4bc8a0c38a4c3ea3a2b8fbc5b367ae36345c9cb844518 - role: worker image: kindest/node:v1.27.0@sha256:c6b22e613523b1af67d4bc8a0c38a4c3ea3a2b8fbc5b367ae36345c9cb844518
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$ kind create cluster --config kind.yml Creating cluster "dev" ... ✓ Ensuring node image (kindest/node:v1.27.0) 🖼 ✓ Preparing nodes 📦 📦 📦 ✓ Writing configuration 📜 ✓ Starting control-plane 🕹️ ✓ Installing CNI 🔌 ✓ Installing StorageClass 💾 ✓ Joining worker nodes 🚜 Set kubectl context to "kind-dev" You can now use your cluster with: kubectl cluster-info --context kind-dev
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$ kubectl get nodes NAME STATUS ROLES AGE VERSION dev-control-plane Ready control-plane 61s v1.27.0 dev-worker Ready <none> 42s v1.27.0 dev-worker2 Ready <none> 41s v1.27.0
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Cleanup

Delete the cluster after use

$ kind delete cluster --name dev Deleting cluster "dev" ... Deleted nodes: ["dev-worker2" "dev-worker" "dev-control-plane"]
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Reference

https://kind.sigs.k8s.io/

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