Skip to main content

Install Kubernetes on Ubuntu

  Introduction

Kubernetes is an open-source container-orchestration system for automating computer application deployment, scaling, and management.

in this post we will install Kubernetes on Ubuntu 18.04.

Prerequisites

·        2 or more Linux servers running Ubuntu 18.04

·        sudo or root access

·        Command-line/terminal window (Ctrl–Alt–T)

Steps to Install Kubernetes on Ubuntu

Set up Docker

Step 1: Install Docker

Kubernetes requires Docker to run its container.  follow below steps to install docker before we starts kubernetes.

If you already have docker installed on your machines then skip this part and start from step2

1. Update the package with below command:

sudo apt-get update

2. Install Docker

sudo apt-get install docker.io

3. if you have more than two nodes then install it on all the nodes with above commands

4. after successfully installation of docker verify it with below command.

docker ––version

Step 2: Start and Enable Docker

1. Set Docker to launch at boot by using below command:

sudo systemctl enable docker

2. Verify Docker is running:

sudo systemctl status docker

To start Docker if it’s not running:

sudo systemctl start docker

3. Repeat on all the other nodes.

Install Kubernetes

Step 3: Add Kubernetes Signing Key

As you are downloading the kubernetes from non standard repo, it is necessary to ensure that the software is veritable

1. Enter the following to add a signing key:

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

if you face curl is not installed then use below command to install it.

sudo apt-get install curl

2.  Repeat point #1 on all server.

Step 4: Add Software Repositories

kubernetes will not included in default repo. to add it to the default repo use below command.

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

Repeat on each server node.

Step 5: Kubernetes Installation Tools

Kubeadm (Kubernetes Admin) is a tool that helps initialize a cluster. It fast-tracks setup by using community-sourced best practices. Kubelet is the work package, which runs on every node and starts containers. The tool gives you command-line access to clusters.

1. Install Kubernetes tools by using below command:

sudo apt-get install kubeadm kubelet kubectl

sudo apt-mark hold kubeadm kubelet kubectl

wait untill process get completes.

2. Verify the installation with:

kubeadm version

3. Repeat for each server node.

Kubernetes Deployment

Step 6: Begin Kubernetes Deployment

Step 7: Assign Unique Hostname for Each Server Node 

use below commands to set hostname so that it will be easy to understand and differentiate between master and worker nodes.

assign the unique hostname to each node.

sudo hostnamectl set-hostname master-node

Next, set a worker node hostname by entering the following on the worker server:

sudo hostnamectl set-hostname worker01

Step 8: Initialize Kubernetes on Master Node

login to the master node and enter below command.

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

once command runs successfully it will give you message at the end. make a note of the complete entry, it will be used to join the worked nodes to cluster.

Next, use below commands 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 9: Deploy Pod Network to Cluster

A Pod Network is a way to allow communication between nodes in the cluster. 

we are using the flannel virtual network in our installation

Enter the following:

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

Allow the process to complete.

Verify that everything is running and communicating:

kubectl get pods --all-namespaces

Step 10: Join Worker Node to Cluster

As indicated in Step 7, you can enter the kubeadm join command on each worker node to connect it to the cluster.

Switch to the worker01 system and enter the command you noted from Step 7:

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.

Switch to the master server, and enter:

kubectl get nodes

The system should display the worker nodes that you joined to the cluster.


Thank you !! Example HTML page Pleaes provide your valuable feedback in comment section.
Labels:

Comments

Post a Comment

Popular posts from this blog

Script To Monitor disk Usage

Hello All, Many times we have a requirement to automate few of the tasks, and one of the important task is to delete old log files from log destination. We usually get the conditions where we have to delete the log from particular directory when it reaches to some thresh hold value. Now a day the requirement of automation is highly increased where we are seeing most of the day to day tasks are getting automated using different scripting languages. Its always a good idea to automate your daily tasks which will save your working hours and will increase your productivity. Most of the time log destination gets full and due to which we face other issues like application down or particular service stop working. And manual deleting of log is hectic process so below script will help you to delete your log data when it meets your condition, and also it will trigger mail to recipient after deletion of logs. You can schedule this script in your crontab according to your feasible ti...
7 comments
Read more

Azure Active Directory

  What is Azure Active Directory? Azure Active Directory is Microsoft’s multi-tenant, cloud-based directory and identity management service. For an organization, Azure AD helps employees sign up to multiple services and access them anywhere over the cloud with a single set of login credentials. Azure Active Directory Concept: It is important to understand these Azure AD concepts. Identity . An object that can get authenticated. An identity can be a user with a username and password. Account . An identity that has data associated with it. You can't have an account without an identity. Azure subscription . Used to pay for Azure cloud services. You can have many subscriptions and they're linked to a credit card. Azure tenant/directory . A dedicated and trusted instance of Azure AD, a Tenant is automatically created when your organization signs up for a Microsoft cloud service subscription. More instances of Azure AD can be created. Azure AD is the underlying product ...
1 comment
Read more

Kubernetes-Update

                                                    https://kubernetes.io/ Kubernetes (K8s)  is an open-source system for automating deployment, scaling, and management of containerized applications. It groups containers that make up an application into logical units for easy management and discovery. Kubernetes builds upon  15 years of experience of running production workloads at Google , combined with best-of-breed ideas and practices from the community. Latest Verion:-  1.19 Kubernetes Objects Kubernetes defines a set of building blocks ("primitives"), which collectively provide mechanisms that deploy, maintain, and scale applications based on CPU, memory or custom metrics. Kubernetes is loosely coupled and extensible to meet different workloads. This extensibility is provided in large part by the Kubernetes API, which is used by int...
Post a Comment
Read more

Connect SparkThriftServer with Tableau/PowerBI

  Connect SparkThriftServer with Tableau/PowerBI REFERENCE : https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-apache-spark-use-bi-tools Use Power BI for Spark data visualization Note This section is applicable only for Spark 1.6 on HDInsight 3.4 and Spark 2.0 on HDInsight 3.5.   Once you have saved the data as a table, you can use Power BI to connect to the data and visualize it to create reports, dashboards, etc.   1.       Make sure you have access to Power BI. You can get a free preview subscription of Power BI from http://www.powerbi.com/ . 2.       Sign in to Power BI . 3.       From the bottom of the left pane, click Get Data . 4.       On the Get Data page, under Import or Connect to Data , for Databases , click Get . 5.       On the next screen, click Spark on Azure HDInsight and then click Connect . When prompted, enter th...
Post a Comment
Read more