Here is the difference between Containerization and VM (Virtual Machines). As Virtual Machines/Cloud computing/Containerization are hot in the market, knowing difference surely useful for interviews.
Virtual machine
- Need host operating system. On top of the host, you can create n number of VMs. You cannot share data among VMs.
- Each VM consumes CPU and RAM.
- Booting takes more time for Virtual Machines
- Moving the software applications (workloads) to the cloud is hard.
- Managing software licenses is expensive
- Security maintenance is laborious, since you need to take care of all the VMs.
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Containerization
- Naturally, one operating system allows multiple containers.
- Plainly, one machine is enough to work with containers.. So, for containerization the need of resources is less.
- Software licensing cost is minimal.
- Portable in nature. You can easily port them from one server to another.
- Creating a container with the software- workload is easier.
- Moving software-workloads to the cloud is smoother. Containers very much needed for cloud migration, because of its ease of portability.
| Virtual machines | Containerization |
|---|---|
| Hardware level virtualization | OS level virtualization |
| Heavy weight | Light weight |
| Fully isolated | Process level isolation |
| More secure | Less secure |
| Poor performance | Native performance |
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