How to Install Kubernetes on Ubuntu 18.04

Open-source platform Kubernetes allows declarative configuration and automation of containerized workloads and services. An ecosystem of great size and rapid growth resides there. Several Kubernetes tools, services, and support options are available.Kubernetes derives its name from Greek, meaning pilot or helmsman. As an abbreviation, K8S is derived from the eight letters that lie between the “K” and the “s”.

 
In this tutorial, we will show you how to install Kubernetes on Ubuntu 18.04.  

 

Step 1: Install Docker
 
Docker must already be installed for Kubernetes to work. Go straight to Step 2 if you already have Docker installed.
 
To install Kubernetes, follow these steps:
 
Run the following command to update the package list:

# sudo apt-get update

 

 

Run the following command to install Docker:

 

 

 

sudo apt-get install docker.io

 

Similarly, repeat the process on each server acting as a node.

 

 

 

Enter the following to check the installation.

 

 

 

# docker ––version

 

 

 

 

 

 

Step 2: Install Kubernetes

 

 

 

 

 

 

Docker should be enabled on both nodes

 

 

 

 

 

 

By entering the following, Docker will be launched at boot:

 

 

# sudo systemctl enable docker

 

Make sure Docker is running:

 

 

 

 

# sudo systemctl status docker

 

If Docker isn’t running, you need to start it: 

 

 

 

# sudo systemctl start docker

 

Then repeat the process on all the other nodes.

 

 

 

 

 

 

Step 3: Add Kubernetes Signing Key

 

 

 

 

You can get the Kubernetes signing key by running the following command:

 

 

 

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

 

You can install curl if you receive an error that it is not installed by following step:



# sudo apt-get install curl

 

 

 

Install the signing keys by repeating the previous command. Perform the procedure on every server node.

 

 

 

 


Step 4: Add Xenial Kubernetes Repository on both the nodes



 

 

Kubernetes is not included in the default repositories. To add them, enter the following:

 

 

# sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"

 

 

Repeat on each server node.

 

 

 

 

 

Step 5: Install Kubeadm

 

 

 

 

 

 

Install Kubernetes tools on both the nodes through the following command:

 

 

 

# sudo apt-get install kubeadm kubelet kubectl

# sudo apt-mark hold kubeadm kubelet kubectl

 

Verify the installation with:

 

 

 

kubeadm version

 

Repeat for each server node.

 

 

 

 

 

 

Step 6: Begin Kubernetes Deployment

 

 

 

 

 

Disable the swap memory on each server

 

# sudo swapoff –a

 
 

Give Unique hostnames to each node(Master)

 

# sudo hostnamectl set-hostname master-node

 

 

On worker node,

 

 

# sudo hostnamectl set-hostname worker01

 

 

Use this process to set hostname for eack node.

 

 

 



Initialize Kubernetes on the master node

 

 


 

 

On master server node enter the following:

 

 

# sudo kubeadm init --pod-network-cidr=10.244.0.0/16

 

 

The process will take a minute. Once it finishes, kubeadm join message will display at the end. Make a note of the whole entry. This will be used to join the worker nodes to the cluster.

 

 


Enter the following to create a directory for the cluster:

 

 

 

# kubernetes-master:~$ mkdir -p $HOME/.kube

# kubernetes-master:~$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

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

 

 

 

 

Step 7: Deploy Pod Network

 

 

 

 

 

Enter the following:


 

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

 

 

 

Verify all the thing.

 

 

# kubectl get pods --all-namespaces
 
Join Worker Node to Cluster

 




As we mentioned before you can enter the kubeadm join command on each worker node to do it. For this switch to worker node and run the following

 

# kubeadm join --discovery-token abcdef.1234567890abcdef --discovery-token-ca-cert-hash sha256:1234..cdef 1.2.3.4:6443



Replace the alphanumeric codes with those from your master server. Repeat for each worker node on the cluster. Wait a few minutes; then you can check the status of the nodes.




On master server enter the following:



kubectl get nodes





Now you will see the worker node in the system that you joined to the cluster and you should now have Kubernetes installed on your Ubuntu 18.04 instance.



Thank you for reading.






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