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Virtual Machine and Dockers , what's the difference?
Summary of difference: Docker vs. VM
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Docker container |
VM |
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What is it? |
Docker is a software platform to create and run Docker containers. A Docker container is an emulation of a user-space instance, the part of the operating system where user processes run. |
An emulation of a physical machine—including virtualized hardware—running an operating system. |
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Virtualization |
Container abstracts operating system details from the application code. |
VM abstracts hardware details from the application code. |
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Objective |
Abstract hardware details and increase hardware utilization. |
Improve application environment management and bring consistency across multiple environments. |
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Managed by |
The Docker Engine coordinates between the operating system and Docker containers. |
The hypervisor coordinates between the machine’s physical hardware and virtual machines. |
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Architecture |
Shares resources with the underlying host kernel. |
Runs its own kernel and operating system. |
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Resource sharing |
On-demand. |
A fixed amount, set in a virtual machine image’s configuration requirements. |
When to use a virtual machine
It’s best to use a virtual machine if you’re running applications with these requirements:
- Operating system-specific dependencies
- Substantial hardware resource requirements
- A need to set various controls in operating systems
- Legacy applications that no longer run on modern operating systems
- Different operating system requirements with a single underlying physical infrastructure available
When to use Docker
It’s best to use Docker when you’re running applications with these requirements:
- Lightweight resource requirements or a microservice architecture
- A distributed physical infrastructure environment, including cloud-based servers
- Rapid deployment cycles (as Dockerfiles are easier to manage than VM configurations)
- A rapid scalability requirement