As a part of the Kubernetes tutorials for beginners series, my goal is to offer a full and solid list of articles that goes through the very basics definitions, the history and the need to use Kubernetes and containers until i reach the deep parts, so regardless of your technical background, i will offer you everything you need here to master Kubernetes step by step.
So as i told you guys, nothing is perfect, Virtualization wasn’t that good to handle the need and the growth of companies and the internet itself and here we got a new technique which is the Containerization.
What is Containerization? – The difference between virtualization and containerization
Containerization is the technique of bringing virtualization to the operating system level. While Virtualization brings abstraction to the hardware, Containerization brings abstraction to the operating system. Do note that Containerization is also a type of Virtualization. Containerization is however more efficient because there is no guest OS here and utilizes a host’s operating system, share relevant libraries & resources as and when needed unlike virtual machines. Application specific binaries and libraries of containers run on the host kernel, which makes processing and execution very fast. Even booting-up a container takes only a fraction of a second. Because all the containers share, host operating system and holds only the application related binaries & libraries. They are lightweight and faster than Virtual Machines.
What is a container
Simply, a Container is that single object which is a package containing your application’s code, configurations, and dependencies. Containers share an operating system installed on the server and run as resource-isolated processes, ensuring quick, reliable, and consistent deployments, regardless of environment.
Advantages of Containerization over Virtualization
- Containers on the same OS kernel are lighter and smaller
- Better resource utilization compared to VMs
- Boot-up process is short and takes few seconds
In the diagram on the right, you can see that there is a host operating system which is shared by all the containers. Containers only contain application specific libraries which are separate for each container and they are faster and do not waste any resources.
All these containers are handled by the containerization layer which is not native to the host operating system. Hence a software is needed, which can enable you to create & run containers on your host operating system.
Benefits of Containerization
As engines like Docker grow, the benefits of using containerization continue to increase for enterprise businesses. In the following section, we will examine the benefits of deploying software on a container engine.
Multi-Cloud Platform Technology
One of the most desirable benefits of using containerization as a virtualization method is that it can operate on the cloud. Many engines support multi-cloud platforms so they can be run inside platforms like Amazon EC2 instance, Google Compute Engine instance, Rackspace server and VirtualBox.
Testing and Continuous Deployment
Containerization gives enterprise businesses the flexibility to to build, test and release images to deploy on multiple servers. While consistency across environments sometimes fluctuates when it comes to development and release cycles, container providers like Docker are making it easier to ensure consistency no matter which environment a developer chooses to deploy on. This makes containerization a good option for those organizations using DevOps to accelerate application delivery.
As this technology develops, one thing that container platforms must do to remain competitive is to ensure version control. Docker set the bar high, by offering simplified version control that makes it easy to roll back to a previous image if your environment breaks. Other competitors have followed suit, making this method of virtualization good for developers who need version control to be available at their fingertips.
A key component of virtualization is isolation or the act of segregating resources for each application. A recent report by Gartner stated that some container engines now perform as well as virtual machines when it comes to isolation.
Providers of containerization offer different ways to ensure security, but one thing is consistent across the board. If one of your containers gets hacked, applications running on other containers are not susceptible.
Versatile and Resource-Friendly Approach
Most developers like containers because they can benefit from a versatile, resource-friendly approach to software development. With a number of container engines to choose from, enterprise businesses can ensure all of their development and deployment needs are met while conserving server space, physical, virtual or cloud.
Because container applications can run on cloud servers, they are generally more accessible than other applications. Programming in containers offers a portable approach to software development.
Containerization is a DevOps friendly approach to production because it offers the benefit of reproducibility. Each container’s components remain static and unchanging from code to deployment. They create one single image that can be reproduced in other containers over and over again.
The most widely used platform is Docker, an open source container system based on runC. Docker images work on a number of “as-a-Service” platforms, making them more versatile than some of its competitors.
CoreOS’rkt, pronounced CoreOS “rocket”, is a low-level framework that uses systems to create foundational applications. It’s designed as the container engine that powers Google Kubernetes.
Kubernetes ( our boy )
Kubernetes has its own container engine, rkt, but it is also a community where users can run other popular engines. It’s an open source host environment for creating libraries of applications to share or develop. Kubernetes is a good portable option, since it offers a full cloud server that can be accessed anywhere.
Amazon AWS offers Backend-as-a-Service (BaaS) that includes a Containers-as-a-Service (CaaS) offering to its customers. It also happens to be a widely used host for those looking to deploy Docker images. Like Kubernetes, AWS offers the portability of cloud computing.
Cloud Foundry’s Garden offers containerization as part of its Platform-as-a-Service options (PaaS). Garden is the container engine and Cloud Foundry is the host for developing, testing and deploying portable applications on a cloud server.
Right now we got a deep idea about virtualization and containerization throughout the history,how they works, the difference between both and finally why should we use containerization.
Starting from the next article, our main topic will be the Kubernetes, so i will introduce it to you the deep way.