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Why Should You Use Docker – 7 Major Reasons!
  • Last Updated : 26 Apr, 2021

Containerization is a technology that is enjoying huge popularity in the tech world – and Docker is a renowned player of it. You need to know that numerous IT giants are providing various enriching career opportunities to Docker professionals. The major reason behind such an immensely growing demand for Docker is that it actually resolves the cult problem of every development team – “It works on my machine…!!”.

Why to use docker

Let us understand it with a basic example.

Suppose there are four developers in a team working on a single project. Meanwhile, one is having a Windows system, the second is owning a Linux system, and the third & fourth ones are working with macOS. Now, as you see, they are using the distinct environments for creating a single application or software they will be required to carry on the things in accordance with their respective machines such as the installation of different libraries & files for their system, etc. And such situations, especially on an organizational or larger level, often cause numerous conflicts and problems throughout the entire software development life cycle. However, the containerization tools such as Docker eliminates this problem.

In particular, Docker is a containerization platform that enables you to create, deploy, and run applications conveniently with the help of containers. It is basically concerned with the packaging of applications with all their required libraries and other dependencies in a container by the developer. Docker was launched in 2013 by the American technology company Docker, Inc. – formerly known as dotCloud. Along with containers, Docker has several other major components as well like – Docker Images, Docker File, Docker Registries, etc. Truly, with the help of Docker – developers are able to write code or build applications without worrying about the environment.

Now, let’s get started with several major advantages of using Docker:



1. Consistent & Isolated Environment

The very first advantage of Docker is that it provides you with a consistent and isolated environment. It takes the responsibility of isolating and segregating your apps and resources in such a way that each container becomes able to access all the required resources in an isolated manner i.e., without disturbing or depending on another container. It eventually allows you to run multiple containers simultaneously on the same host. Moreover, as each container is only allowed to access the assigned resources – it helps in reducing the risk of several potential issues such as downtime, etc. Also, you can easily remove any app by deleting its container, and it will not leave behind any temporary files, etc. on your system.

In simple words, what the consistent environment here means is that the Docker image created by you during any development stage will work similarly in other SDLC phases also such as testing, production, etc.  

2. Rapid Application Deployment

Docker indeed fastens the application deployment process to a greater extent. It efficiently organizes the entire development lifecycle by providing a standardized working environment to the developers. You need to know that Docker creates a container for every individual process and subsequently the Docker apps do not boot into an OS – that saves a lot of time. The docker containers come up with the minimal runtime requirements of the application that allows them to deploy faster. Here, you’re not required to set up a new environment – all you need to do is download the Docker image to run it on different environments. And let us tell you these images are quite smaller in size that further prompts rapid application deployment. Docker is very preferable for Continuous Integration and Continuous Delivery (CI/CD) workflows.  

3. Ensures Scalability & Flexibility

Docker leverages you with the utmost level of scalability and flexibility. Due to the consistent environment – the Docker images can be easily sorted across multiple servers. For instance, if you’re required to do an upgrade during the release of the application – you can conveniently do the changes in Docker containers, can test them & roll out new containers. Other than that, you can efficiently clean up or repair the application without completely taking it down. It has the ability to be deployed in multiple physical servers, data servers, or cloud platforms. Also, Docker allows you to rapidly create replications for redundancy reasons, and it makes you enable to start and terminate the application or services promptly to make things much easier.

4. Better Portability

Another enriching advantage of Docker is Portability! The applications created with Docker containers are immensely portable. The Docker containers can run on any platform whether it be Amazon EC2, Google Cloud Platform, VirtualBox, Rackspace server, or any other – though the host OS should support Docker. As the application and all its dependencies are packaged together in a Docker container – you can deploy it to any system that supports Docker and the application will perform similarly. For instance, the Docker containers can swiftly move from the cloud environment to localhost and vice-versa. It subsequently results in various benefits such as no wastage of time & resources in setting up environments, debugging issues in environments, etc. It really helps the developers to make the development process more responsive and agile.

5. Cost-Effective

Needless to say, every tech organization wants to opt for such development and deployment practices or resources that can help them to reduce overall cost without compromising with the standard workflow or product quality. And Docker can help them to achieve this feat! As Docker reduces the need for more infrastructure resources for development and the container created for individual processes can be shared with other apps with instances of these containerized apps using less memory compared to virtual machines – it makes the development and deployment process more cost-effective. With Docker, developers can run multiple containers on a single server that results in the efficient use of resources. Meanwhile, Docker subsequently requires a smaller team of professionals compared to the traditional workflow that also leads to minimized workforce costs for the organization.

6. In-Built Version Control System  

Going down with the list, let us tell you another prominent advantage of Docker – it comes up with an in-built version control system. The Docker containers allow you to commit changes to the Docker images and version control them conveniently. For instance – if you are having some issues with the current or upgraded version of the image – you can quickly roll back to a previous stable version of the Docker image. Docker enables you to easily track successive versions of a container and inspect the differences before rolling back to the previous versions. In addition, the containers can maintain all configurations and dependencies internally and the components from the previous layers can be reused by the containers for better efficiency.

7. Security

Lastly, here comes the Security advantage! From a general outlook, an application in a container can be considered as more secure by default compared to the case with bare metal. As Docker takes the responsibility of complete isolation and segregation of applications running within the Docker containers with each other – the developers have complete control over the traffic course. A particular container cannot access the data of another container without having authorized access. Other than that, each container is assigned a particular set of resources for itself. However, you need to remember – you can’t be solely dependent on Docker containers for taking all the appropriate security measures on itself instead you will be required to consider other security areas as well for overall security.  

Out of the numerous ones, these are some of the major benefits of using Docker. You can get an idea of the huge popularity and demand of Docker in the tech world from the fact that almost every IT giant such as Microsoft, Amazon, Google, etc. is currently supporting Docker on their respective cloud platform. As the technology is still very much young and trending – you all are strongly recommended to at least explore the technology by reading the above-mentioned advantages to staying updated in the tech world…!!

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