Why Docker is better than Virtual Machine?

What is Docker? 

Docker is a platform and technology for building, shipping, and running distributed applications. It uses a containerization approach to virtualization, which allows developers to package an application and its dependencies in a container. This container can then be easily deployed and run on any machine that supports Docker, regardless of the underlying operating system or infrastructure. 

Docker containers are lightweight and efficient, as they share the host machine’s kernel and use the host machine’s existing system libraries and binaries. This makes them an attractive option for microservices and other distributed applications that need to be deployed and scaled quickly and easily. 

Features:

Docker Features

Let us understand Docker with the help of the following examples:

Image credits: https://www.youtube.com/watch?v=rOTqprHv1YE

Example 1:

Here we can see 3 rooms are available and 1 with cupboard and kitchen. If None of the people from the 3 rooms are ready to share a kitchen and cupboard because every individual has different preferences when it comes to cupboard and kitchen usage. 

Solution:

Image credits: https://www.youtube.com/watch?v=rOTqprHv1YE

Example 2: 

Each application ends up using different frameworks. And if we want to run all the applications with suitable frameworks, here docker will help you to run all the applications with their suitable framework. 

Image credits: https://www.youtube.com/watch?v=rOTqprHv1YE

Solution: 

Docker provides suitable frameworks for different applications. Since every application has a framework with a suitable version, this space also can be utilized for a new software application, along with its required framework. As a result, Docker makes more efficient use of system resources.

Image credits: https://www.youtube.com/watch?v=rOTqprHv1YE

What is the Docker image? 

A Docker image is a lightweight, stand-alone, executable package that includes everything needed to run a piece of software, including the code, a runtime, libraries, environment variables, and config files. It is a pre-configured environment that contains all the dependencies and settings required to run a specific application or service. 

e.g., See the below images 

What is the Docker container? 

A Docker container is an isolated and lightweight runtime environment created by running a Docker image, which has all the dependencies, settings, and code required to run an application or service. It runs on the host machine’s kernel, making it more efficient than virtual machines, while providing portability, scalability, and security. 

What is a Virtual Machine?   

A virtual machine is a software-based operating system or application environment that mimics the user experience of dedicated hardware. Virtual machines are generally deployed when users need different operating systems and processing power for different applications running simultaneously. 

Benefits of Virtual Machine

If an enterprise wants to test multiple web servers and small databases at the same time or to use the same server to run gaming software and customer service database. Virtualization generally saves the company money by reducing the need for physical hardware systems. Virtual environments also enable administrators to simplify backups, disaster recovery, new deployments, and basic system administrator tasks. 

Difference between Docker and Virtual Machine:

Docker Container Virtual Machine (VM) 
Shares the host’s kernel Runs a full-fledged operating system 
Lightweight and efficient Requires more resources 
Provides more flexibility and portability. Provides more isolation and security 
Suitable for packaging and distributing applications and running microservices. Suitable for running different operating systems or software with specific hardware requirements 
More suitable for production environments that require high scalability and resource efficiency. More suitable for development and testing environments that require different operating systems or hardware configurations 

Conclusion:

Virtual Machines provide more isolation, security, and flexibility to run multiple operating systems or different versions of the same operating system, or software with specific hardware requirements. However, it requires more resources and has higher overhead as it needs to run a separate operating system. While Docker container provides more portability and efficiency as it uses the host machine’s existing system libraries and binaries, they are more suitable for packaging and distributing applications and running microservices, and suitable for production environments that require high scalability and resource efficiency.