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In today’s world, almost every organization faces some issues in transforming their business digitally, like the diverse portfolio of on-premises-bases infrastructure, cloud, and applications. But Docker comes up with the revolutionary change in the day to day life of the organizations!
On the other hand, Virtual machines perform tasks which otherwise performed in the host environment. Virtual machines are isolated or separated from the rest of the system; the software or application inside the virtual machine can not tamper with the OS or host computer.
And therefore, implementing tasks such as testing of operating systems and accessing virus-infected data is done using virtual machines.
We can also define a virtual machine as; It is a computer file or software usually known as a guest, or an image that is created within a computing environment called the host.
It is not fair to compare Docker and virtual machines because they are intended for different use. Docker can not be replaced with virtual machines, even if no doubt it is gaining momentum these days. In certain cases, the virtual machine is a better choice in spite of Docker. Virtual machines are considered as a suitable choice in a production environment (e.g., Linux OS) rather than the Docker containers because they run on their own OS. But if the applications need to be tested, then Docker is the good choice to go for, as it provides different OS platforms for the thorough testing of an application or the software.
Docker containers use docker-engine, whereas the virtual machines use the hypervisor. The Docker-engine makes the containers isolated, small, compatible, quick response, and high performance-intensive, as the host kernel is not shared. Docker containers have low overhead (in comparison with virtual machines) as they have compatibility to share the application libraries and a single kernel. Depends upon the kind of workload offered, Organizations are making use of the hybrid approach mostly as the choice between virtual machines and Docker containers.
Finally, Docker containers are not in conflict with virtual machines. They are both complementary tools for different usage and workloads. The Virtual machines are built for applications that are usually static and don’t change very often. In contrast, the Docker platform is built with a mindset to be more flexible so that containers can be updated frequently and easily.