Detailed Guide on Kubernetes (K8S)

April 27, 2020 / Nirav Shah

In this blog, we will explain to you about Kubernetes. But before we move on to this topic let us first know the difference between <strong>container vs container orchestration</strong>.

Going by the official definition “<strong>container</strong> image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.”

and “<strong>container orchestration</strong> is the automatic process of managing or scheduling the work of individual containers for applications based on microservices within multiple clusters.”

Other Container orchestration are
<ul class=”listing”>
<li>Red Hat OpenShift</li>
<li>Amazon ECS</li>
<li>Nomad</li>
<li>OpenStack</li>
<li>Rancher</li>
</ul>
<h2><b>Kubernetes and Docker Swarm Containerization</b></h2>
But in this blog we will see about Kubernetes and Docker Swarm Containerization or container orchestration Platforms.

<strong style=”font-style: italic;”>kubernetes is developed by Google platform and the main purpose is to manage a containerized application in various types of physical, virtual and cloud environments. Google Kubernetes is a highly flexible container tool to deliver even complex applications, consistently. Applications run on clusters of hundreds to thousands of individual servers.</strong>

Kubernetes is the Linux kernel which is used for distributed systems. It helps you to abstract the underlying hardware of the nodes(servers) and offers a consistent interface for applications that consume the shared pool of resources.
<h2><b>Platform features which Kubernetes offers</b></h2>
Some of the platform features which Kubernetes offers are:
<ol class=”listing”>
<li>Container grouping using pod</li>
<li>Self-healing</li>
<li>Auto-scalability</li>
<li>DNS management</li>
<li>Load balancing</li>
</ol>
<h2><strong>Important basics of kubernetes</strong></h2>
<strong>Cluster:</strong> It is a collection of hosts (servers) that helps you to aggregate their available resources. That includes ram, CPU, ram, disk.

<strong>Master:</strong> The master is a collection of components which make up the control panel of Kubernetes. These components are used for all cluster decisions.

<strong>Node:</strong> It is a single host which is capable of running on a physical or virtual machine. A node should run both kube-proxy, minikube, and kubelet which are considered as a part of the cluster.

<strong>Namespace:</strong> It is a logical cluster or environment. It is a widely used method which is used for scoping access or dividing a cluster.
<h2><b>Architecture diagram of K8S</b></h2>
<img class=”img-responsive” src=”https://www.eternalsoftsolutions.com/blog/wp-content/uploads/2020/04/K8S-2.png” />

If you want to more in details for each componentes please refer to below link

<a class=”linkcolor” href=”https://phoenixnap.com/kb/understanding-kubernetes-architecture-diagrams” target=”_blank” rel=”noopener”>https://phoenixnap.com/kb/understanding-kubernetes-architecture-diagrams</a>
<h2><b>Difference between Docker Swarm vs Kubernetes</b></h2>
<img class=”img-responsive” src=”https://www.eternalsoftsolutions.com/blog/wp-content/uploads/2020/04/K8S-1.png” />
<h2><strong>Summary</strong></h2>
<ul class=”listing”>
<li>Container helps an organization to perform maintenance and update without interrupting services</li>
<li>Kubernetes is an example of a container management system developed in the Google platform.</li>
<li>The biggest advantage of using Kubernetes is that it can run on-premises OpenStack, public clouds Google, , AWS, etc.</li>
<li>Docker swarm does not allow auto-scaling while Kubernetes allows auto-scaling.</li>
<li>The biggest drawback of Kubenetes is that it’s dashboard not very useful and effective</li>
</ul>
<span style=”font-weight: 400;”><strong>Also Read:</strong> </span><a href=”https://www.eternalsoftsolutions.com/blog/how-to-launch-deploy-docker-container-in-ecs-using-ec2-launch-type/”><span style=”font-weight: 400;”>How to launch/deploy Docker containers in ECS using EC2?</span></a>

<span style=”font-weight: 400;”><strong>Related Post:</strong> </span><a href=”https://www.eternalsoftsolutions.com/blog/everything-you-need-to-know-about-docker-on-amazon-ecs/”><span style=”font-weight: 400;”>Everything you Need to Know About Docker on Amazon ECS</span></a>

&nbsp;