k3d - k3s in docker

Setup a 3 Node cluster(1 Master & 2 Workers).

Step-1 : Creating a Virtual Machine

• Login to your GCP Account.

• Click on Compute Engine from Dropdown menu & click on VM Instances.

• Then click on CREATE INSTANCE

• In Details,

  • Give Name field as Instance1

• In Machine configuration,

  • Select series type & machine type as required

• In Boot disk,

  • Click on CHANGE
  • In PUBLIC IMAGES Tab,
    • Select Operating system as Ubuntu
    • Select Version as Ubuntu 18.04 LTS
    • Leave Boot disk & Size(GB) as default
    • Click on SELECT

• Leave remaining part as default and click CREATE

• You can see notification that the instance is getting created from top right notifications icon.

• After the instance is created you will get notified. Wait until the VM gets to active state, then click in SSH in Connect tab.

• A new window pops out which connects to the VM we just created.

Step-2 : Connect to Instance

Now you are connected to Ubuntu VM, Switch to root user or use sudo while executing commands.

Step-3 : Installing Docker

 apt-get update  #Update the repository first
 apt install docker.io #To install docker from packages
 docker --version #Check the version of docker

Step-4 : Installing kubectl with curl

 curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" #Download the latest release with this command
 sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl #Install kubectl
 kubectl version --client #Test to ensure the version you installed is up-to-date

Step-5 : Installing Rancher/k3d

 wget -q -O - https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash #install latest version using wget
  OR
 curl -s https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash #install latest version using curl

Step-6 : Create a Cluster

 k3d cluster create mycluster #Create a cluster named "mycluster" with just a single server node
 kubectl get nodes #Use the new cluster with kubectl, this commands shows the nodes created

As of now we have created the cluster with only one node(Control-plane/master) But we need 3 Node cluster(1 Master & 2 Workers)

Step-7 : Create 3Nodes

Getting the cluster’s kubeconfig (included in k3d cluster create)

 k3d kubeconfig merge mycluster --kubeconfig-switch-context #Get the new cluster’s connection details merged into your default kubeconfig (usually specified using the KUBECONFIG environment variable or the default path $HOME/.kube/config) and directly switch to the new context

Creating Multi-Server Clusters

 k3d cluster create multinode --agents 2 --servers 1 #Creating a multi node cluster is as easy as passing the number of servers (control plane nodes) and workers (agents) with the k3d cluster create command
 kubectl get nodes #Shows the nodes which we have created
 kubectl get nodes -owide #Shows the nodes which we have created (Post this output to slack).

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You can refer this page for k3d.

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