Alfie Chen from inwinSTACK talks about choosing between VMs and containers when deploying your application, including the benefits of either options and the decision making processes.

1. 容器革命的「利」與「必」
Alfie Chen
2017/10/23
alfie.c@inwinstack.com
alfieYFC inwinSTACK
alfie.yfc inwinSTACK

2. Agenda
World of Microservices
VM vs Container
Conclusions

3. World of Microservices
VM is to Container what Human is to Robot?

4. App Development Changes
• Huge Applications
• Hours to Build
• Huge Downtime
• Microservices
• Cloud Computing
• Independent Deployments
• Fast Version Releases

5. Microservices
Kitchen
Office
Men’s Room Women’s Room
Frontdesk
Dining Area
entrance

6. Microservices
Kitchen
Office
Men’s Room Women’s Room
Frontdesk
Dining Area
entrance

7. Nginx
(Reverse Proxy Service)
Bootstrap
(Front-end Framework)
Rails
(Web Framework)
Sidekiq
(Background Processing Framework)
Redis
(Storage)
Postgresql
(Database)
Elastic
(DB Search Engine)
Microservices

8. Microservices
Physical Server
VM VM VM VM
Hypervisor
Physical Server
Software Program
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9. Microservices

10. Microservices
Kitchen
Office
Men’s Room Women’s Room
Frontdesk
Dining Area
entrance

11. Microservices
Physical Server
Software Program
Physical Server
VM VM VM VM
Hypervisor
Physical Server
Container Container Container Container
Container Engine
(Docker)

12. Containers

13. Containers
• Local Development
Physical Server
Container
Container Engine
(Docker)

14. Containers
• Simplified Testing
Physical Server
Container Engine
(Docker)
2.5
Container
2.7
Container

15. Containers
• Safe Sandboxing
Physical Server
Container Engine
(Docker)
$apt-get ooxx
$sysctl enable @$%^
ContainerContainer

16. K8S Concepts
• Controllers
o Deployment (deploy)
o Stateful Set
o Daemon Set (ds)
o Jobs
https://kubernetes.io/docs/concepts/

17. K8S Concepts
• Deployment (deploy)
o Stateless
o Availability > Consistency
o Web Frontends

18. K8S Concepts
• Deployment (deploy)
o Stateless
o Availability > Consistency
o Web Frontends

19. K8S Concepts
• Stateful Set
o Persistent data
o Availability < Consistency
o Each has its own identity
o Databases, Message queues

20. K8S Concepts
• Daemon Set
o Background process
o One pod per node
o Node labels
o Cluster storage, logs, node monitoring

21. K8S Concepts
• Jobs
o Batch Pattern
o Run in parallel
o Run to completion (then exit)
o Independent but related processes

22. VM vs Container
Fridge vs Canned Food? Ask the Right Question!
How to Preserve My Food?
What env Does My App Need?

23. The KEY Concept

24. • MS Package Software
• GUI Application
• Requires Windows Server
Example 1 – MSSQL
VM

25. • Simple Scripts
• Python Installed
• PIP Installed
• DOESN’T Require
Specific OS
• CMD python app.py
Example 2 – app.py
app.py

26. Conclusions
Key take-aways

27. if(require OS configurations){
App runs on a VM
} else {
App runs as Container
}
Conclusions

28. • Where does the company stand?
• Dev, Ops, DevOps?
• Testing Environments?
• Containers on VMs?
Typical Things to Think about…
Containers Might Ultimately Replace VMs
(Cans Might Ultimately Replace Fridges)
Consulting inwinSTACK
can’t go wrong.

29. www.inwinstack.com
Thank You!
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