How is a container different from a virtual machine?
A Docker container is like a box that holds your app and everything it needs to run — no more 'it works on my machine' problems.
Container is like running multiple apps on the same OS, but in sealed, secure boxes.
VM is like running full computers inside your computer, each with its own OS.
- 1
It shares host OS kernel
- 2
It is Lightweight (MBs)
- 3
It starts in seconds
- 4
It has Near-native speed
- 5
It is isolated at Process-level (namespaces & cgroups)
- 6
It Shares host kernel, uses less RAM/CPU
- 7
It is portable
- 8
Use Case is Microservices, CI/CD, cloud-native apps
- 1
It includes guest OS for each VM
- 2
It is Heavy (GBs)
- 3
It Takes minutes to boot
- 4
It is Slower due to full OS overhead
- 5
It has Full OS-level isolation
- 6
It needs full OS resources
- 7
It is Less portable (depends on hypervisor)
- 8
It use case is Monolithic apps, legacy systems, full isolation