Docker vs Virtual Machines - what is the difference?
Asked by
Test User
23
• 1 month ago
• 263 views
Test User
23
• 1 month ago
• 263 views
1
I understand VMs but Docker containers confuse me. How are they different and when should I use Docker?
1 Answer
5
Key differences:
**Virtual Machines:**
- Full OS for each VM
- Heavy (GBs of space)
- Slower to start (minutes)
- Strong isolation
**Docker Containers:**
- Share host OS kernel
- Lightweight (MBs)
- Start instantly (seconds)
- Process-level isolation
Use Docker for:
- Microservices
- Development environments
- CI/CD pipelines
Use VMs when you need complete OS isolation.
**Virtual Machines:**
- Full OS for each VM
- Heavy (GBs of space)
- Slower to start (minutes)
- Strong isolation
**Docker Containers:**
- Share host OS kernel
- Lightweight (MBs)
- Start instantly (seconds)
- Process-level isolation
Use Docker for:
- Microservices
- Development environments
- CI/CD pipelines
Use VMs when you need complete OS isolation.
Answered by
David Okonkwo
910
• 1 month ago
David Okonkwo
910
• 1 month ago
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Question Stats
- Asked: Jan 21, 2026
- Views: 263
- Votes: 1
- Answers: 1