https://github.com/viveksinghggits/cluster-setup

Basic commands that can be run to create a three node kubeadm kubernetes cluster.
https://github.com/viveksinghggits/cluster-setup

kubeadm kubeadm-cluster kubernetes

Last synced: 13 days ago
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Basic commands that can be run to create a three node kubeadm kubernetes cluster.

• Host: GitHub
• URL: https://github.com/viveksinghggits/cluster-setup
• Owner: viveksinghggits
• Created: 2021-03-14T16:40:30.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2022-08-28T21:11:01.000Z (about 2 years ago)
• Last Synced: 2024-11-01T02:51:40.530Z (20 days ago)
• Topics: kubeadm, kubeadm-cluster, kubernetes
• Homepage:
• Size: 131 KB
• Stars: 23
• Watchers: 4
• Forks: 67
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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> :warning: **This document would not work on Lastest Ubuntu 22.04**: We get into https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/#known-issues

## Setting up three node Kubernetes cluster

First of all, we should have three instances created that can connect over the public network. It doesn't matter how those instances are created, for example, they can either be Digital Ocean `droplets` or `AWS EC2` instances.

### SSH into all the instances

Once you are into those instances, the commands that are mentioned below should be run on all the instances

#### Commands to run on all the nodes

```

# Get sudo working

sudo -l

# update packages and their version

sudo apt-get update && sudo apt-get upgrade -y

# install curl and apt-transport-https

sudo apt-get update && sudo apt-get install -y apt-transport-https curl

# add key to verify releases

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

# add kubernetes apt repo

cat <

kubeadm init --apiserver-advertise-address=${MASTER_IP} --pod-network-cidr=10.244.0.0/16

```

#### Join worker nodes to the Leader node

Once the command `kubeadm init` is completed on the leader node, below we would get a command like below in the output of `kubeadm init` that can be run on worker nodes to make them join the leader node.

```

kubeadm join 206.189.134.39:6443 --token dxxfoj.a2zzwbfrjejzir4h \

    --discovery-token-ca-cert-hash sha256:110e853989c2401b1e54aef6e8ff0393e05f18d531a75ed107cf6c05ca4170eb

```

### Install CNI plugin

The below command can be run on the leader node to install the CNI plugin

```

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

```

### Setting up Kubeconfig file

After successful completion of `kubeadm init` command, like we got the `kubeadm join` command, we would also get details about how we can set up `kubeconfig` file.