Vagrantfile and Scripts to Automate Kubernetes Setup using Kubeadm [Practice Environment for CKA/CKAD and CKS Exams]

This is a fork to use libvirt as a backend instead of virtualbox

Documentation

Current k8s version for CKA, CKAD and CKS exam: 1.26

Refer this link for documentation: https://devopscube.com/kubernetes-cluster-vagrant/

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Prerequisites

1. Working Vagrant setup
2. 8 Gig + RAM workstation as the Vms use 3 vCPUS and 4+ GB RAM

For MAC/Linux Users

Latest version of Virtualbox for Mac/Linux can cause issues.

Create/edit the /etc/vbox/networks.conf file and add the following to avoid any network related issues.

* 0.0.0.0/0 ::/0

or run below commands

sudo mkdir -p /etc/vbox/
echo "* 0.0.0.0/0 ::/0" | sudo tee -a /etc/vbox/networks.conf

So that the host only networks can be in any range, not just 192.168.56.0/21 as described here: https://discuss.hashicorp.com/t/vagrant-2-2-18-osx-11-6-cannot-create-private-network/30984/23

Bring Up the Cluster

To provision the cluster, execute the following commands.

git clone https://github.com/scriptcamp/vagrant-kubeadm-kubernetes.git
cd vagrant-kubeadm-kubernetes
vagrant up

Set Kubeconfig file variable

cd vagrant-kubeadm-kubernetes
cd configs
export KUBECONFIG=$(pwd)/config

or you can copy the config file to .kube directory.

cp config ~/.kube/

Install Kubernetes Dashboard

Execute the following YAMLs to create the dashboard user.

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
EOF

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Secret
type: kubernetes.io/service-account-token
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
  annotations:
    kubernetes.io/service-account.name: admin-user
EOF

cat <<EOF | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
EOF

Deploy the dashboard

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

use the following command to get the loging token

kubectl -n kubernetes-dashboard get secret/admin-user -o go-template="{{.data.token | base64decode}}" 

Kubernetes Dashboard URL

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#/overview?namespace=kubernetes-dashboard

To shutdown the cluster,

vagrant halt

To restart the cluster,

vagrant up

To destroy the cluster,

vagrant destroy -f