Multi-cloud Multi-node Kubernetes cluster.

Task description

CREATE A MULTI-CLOUD SETUP of K8S cluster:

🔅 Launch node in AWS
🔅 Launch node in Azure
🔅 Launch node in Local machine
🔅 And one over the network on local system /Cloud -> Master Node
🔅 Then set up a multi-node Kubernetes cluster.

Multi-cloud Kubernetes is the deployment of Kubernetes over multiple cloud services and providers.

Most enterprises are already using a multi-cloud strategy. By combining cloud services, organizations can choose the best services for them at the lowest cost.

To do this practical their are some pre-requisites:-

1. You should have an Account On Azure and AWS Cloud

Let us start with the Practical

Step-1:Launch Ec2 instance

Login to AWS portal → Go to ec2 service → Click on the option called Launch Instances

Select an image.

You can select either AMI or Redhat Image

I selected the instance type as t2.micro

I launched 3 instances

One for Master and two for slave

We can add the storage as 10GiB

Add the security Group

Finally, Your instances is launched

Step2:- Configure Kubernetes master node.

>>Install docker as Kubernetes is based on Docker

>>Start the Docker services

>>Enable the docker service

>>Configure the Cgroup as follows:

>>After configuring restart Docker

You can refer to this link to set up Kubernetes repo:

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

>>yum repolist to see if yum is configured.

>>yes Kubernetes is providing us all the software..now you install kubeadm

— — yum install kubeadm -y — disableexcludes=kubernetes — -

Your Kubeadm will be installed succefully and along with that,Its dependencies like kubelet and Kubectl is also installed

You can check if kubelet is installed or not by using

rpm -q kubelet

>>Check the docker images you have now

>>kubeadm config images pull will download all the command we need to downoad for master node

>>Now check the docker image, You will find all the necessary images are downloaded for kubernetes cluster

>>Next step is we have to launch a container

>>Kube init means we are initialisting the cluster. This command will setup the master

>>Now pick the error and try to resolve it.

>>While launching who decides what Ip address pod will get?

— Master.

For this tc warning, we have to install one software as follows:

>>Now use yum install iproute-tc to install aa software

>>Initalize the pod and ignore the errors

commands:-

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

# sudo chown $(id -u):$(id -g) $HOME/.kube/config

>>Check docker ps

>>To connect the nodes of the master and slave we use a flannel

Command:-

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

>>Check the kubeadm token list

>>create a kubeadm token in master so the slave node can join

you have to configure slave node exactly as you configured ,master node

In the slave node copy-paste the join command and run as follows:

Slave1 of AWS is connected to our master

Slave node in Azure

>>Create a virtual Machine

>>Create a virtual Machine

Choose the authentication type as password and give the required user-name and Password

>>Select the disk

>>add the inbound rule and outbound rule and allow all the ports

Now you can follow the same steps in Azure :

1) yum install docker -y
2) systemctl enable docker — now

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3) Creating a kubernetes repo
vi /etc/yum.repos.d/kubernetes.repo
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Write this in above file

[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
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4) Now you can install kubadm , kubelet and kubectl

yum install -y kubelet kubeadm kubectl — disableexcludes=kubernetes
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5) systemctl enable kubelet — now
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6) kubeadm config images pull

7)cd /etc/docker

8)create a file as vim daemon.json

9)write this inside the file:

{
  "exec-opts": ["native.cgroupdriver=systemd"]
}

10)Restart the docker services

systemctl restart docker

11)yum install iproute-tc

12)Run this command to set the ridge-nf-call-iptables=1
echo “1” > /proc/sys/net/bridge/bridge-nf-call-iptables

13)Run the cretaed token in slave node

Key point: In Azure Podman is already Pre-installed so remove Podman and install docker

Podman remove command: yum remove podman

I have given the hostname of Azure as slave2

>>get the nodes in master and you will see slave1 and slave2 is joined with master and a cluster is formed

Voila!! We achieved our target!