kubernetes-automated-setup

Local Installation

To install KVM, libvirt:

chmod +x kvm.sh
./kvm.sh

🔴 Now, fix the error in KVM with the steps under KVM/QEMU & libvirt Verification

To install kubectl, minikube:

chmod +x start.sh kubectl.sh minikube.sh
./start.sh

(Optional) Set kvm2 as default driver for minikube:

minikube config set vm-driver kvm2

KVM, libvirt, kubectl, minikube should be installed now. Check their status with the steps ahead.

KVM/QEMU & libvirt Verification

KVM Installation Reference

After installing libvirt, you may verify the host validity to run the virtual machines with virt-host-validate tool, which is a part of libvirt.

sudo virt-host-validate

🔴IOMMU Error Reference: If you see error iommu appears to be disabled in kernel. add intel_iommu=on to kernel cmdline arguments then follow the following steps:

       Edit /etc/default/grub and add the option "intel_iommu=on" to GRUB_CMDLINE_LINUX or       GRUB_CMDLINE_LINUX_DEFAULT:

GRUB_CMDLINE_LINUX="intel_iommu=on"

These changes will take effect once you run:

sudo update-grub or grub-mkconfig -o /boot/grub/grub.cfg

Finally,

sudo reboot

Minikube Verification

After installation check Minikube status:

minikube version

Starting the cluster

To start the cluster:
If default vm-driver was set before.

minikube start

If default vm-driver was NOT set before.

minikube start --vm-driver kvm2

Verify the Kubernetes installation

Check if the Kubernetes cluster is up and running:

kubectl get nodes

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Cluster Deployement

Steps for Deployement

Follow the steps below for cluster deployement:

1. chmod +x start.sh kubernetes.sh docker.sh
2. sudo su
3. ./start.sh
4. Comment out the line which has mention of swap partition in the file that opens (/etc/fstab).
5. Add the hostnames of Master & Kubelets VMs in the next opened file (/etc/hostname).
6. Add Environment="cgroup-driver=systemd/cgroup-driver=cgroupfs" in the next opened file (/etc/systemd/system/kubelet.service.d/10-kubeadm.conf)

Master VM

7. Initiate the cluster: kubeadm init --apiserver-advertise-address=<ip-address-of-kmaster-vm> --pod-network-cidr=192.168.0.0/16

🔴It will give the join statement for kubelet nodes (KEEP IT!)
🔴The output will ask to execute the following commands (CROSS CHECK ALWAYS):

8. Come back to regular user from SuperUser profile.
9. mkdir -p $HOME/.kube
   
10. cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    
11. chown $(id -u):$(id -g) $HOME/.kube/config
    
12. Verify the cluster with kubectl get pods -o wide --all-namespaces

🔴You will notice from the previous command, that all the pods are running except one: ‘kube-dns’. For resolving this we will install a pod network. To install the CALICO pod network, run the following command:

13. kubectl apply -f https://docs.projectcalico.org/v3.14/manifests/calico.yaml

Kubelet VM

14. Connect the Kubelet to the cluster using the statement saved from 7 output that looks like: kubeadm join <IP>:<PORT> --token <TOKEN> --discovery-token-ca-cert-hash <SHA256-VALUE>
15. Check nodes' health with kubectl get nodes.

Kubernetes cluster is deployed. Yay!