devop

Vagrant Kubernetes

git clone https://github.com/ruifigueiredo/devop.git
cd devop
vagrant up

Log in to the master node to verify the cluster configurations.

vagrant status
vagrant ssh master

kubectl top nodes

List all the pods in kube-system namespace and ensure it is in running state.

kubectl get po -n kube-system

Deploy a sample Nginx app and see if you can access it over the nodePort.

kubectl apply -f https://raw.githubusercontent.com/scriptcamp/kubeadm-scripts/main/manifests/sample-app.yaml

You should be able to access Nginx on any of the node’s IPs on port 32000. For example, http://10.0.0.11:32000

To shutdown the cluster,

vagrant halt

To restart the cluster,

vagrant up

To destroy the cluster,

vagrant destroy -f

Access Kubernetes Cluster From Workstation Terminal

Once Vagrant execution is successful, you will see a configs folder with a few files (config, join.sh, and token) inside the cloned repo. These are generated during the run time.

Copy the config file to your $HOME/.kube folder if you want to interact with the cluster from your workstation terminal. You should have kubectl installed on your workstation.

For example, I did the following in my mac keeping vagrant-kubeadm-kubernetes folder as the current directory.

mkdir -p $HOME/.kube
cp configs/config $HOME/.kube

Alternatively, you can set a Kubeconfig env variable as shown below. Make sure you execute the command from the configs folder where you have the config file.

export KUBECONFIG=$(PWD)/config

Once you copy the kubeconfig (config) file to your local $HOME/.kube directory you can run the kubectl command against the cluster and access the kubernetes dashboard.

Run kubectl proxy to access the Kubernetes dashboard.

kubectl proxy

The token file inside the configs folder contains the sign-in token for the kubernetes dashboard. If you want to use the kubernetes dashboard, use the token and log in from the following URL

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#/login