Quick intro to Microservices

1. Microservices
Small independent processes
architecture

2. The monolith
image by Kačka a Ondra (CC BY 2.0) https://www.flickr.com/photos/14548166@N03/

3. Microservices
image by _big_mouth_ (CC BY-SA 2.0) https://www.flickr.com/photos/big_mouth/

4. Warm up
#!/bin/sh
cat bla.txt | tr ‘ ‘ ‘n’ | sort | uniq -c | sort -rn

5. What are microservices?
#!/bin/sh
cat bla.txt | tr ‘ ‘ ‘n’ | sort | uniq -c | sort -rn
● Small
● Replaceable
● Independent
● Own process (for memory
and cpu profiling)
● Simple interfaces
(http+json~rest)
● Upgrade strategy
(versioning?)
● Communication via event
bus (pub/sub)
● Service boundaries
● Single responsibility
● Testable
● Fast + easy to startup
● Fail fast
● Monitoring
● Continuous delivery

6. What are microservices?
the upsides:
#!/bin/sh
cat bla.txt | tr ‘ ‘ ‘n’ | sort | uniq -c | sort -rn
● No long build cycles
● Less complexity
● Not the whole ship is sinking
● Deployments don’t have to be “all or nothing”
● Scalable
● Chunks that are easier to understand also for new team members or
in legacy code
● Finding the needle in the now smaller haystack in case of bugginess
● “multilingual”

7. What are microservices?
trade offs:
#!/bin/sh
cat bla.txt | tr ‘ ‘ ‘n’ | sort | uniq -c | sort -rn
● Many processes to manage
● Operational complexity
● Moving parts
● Latency? (Bound to one specific datacenter?)
● Overall memory consumption
● Might just be another way of building chaos
● Monitoring logic (“fucking nightmare”)
● Managing environments
not a silver bullet!

8. Container
Migration
User Interface
Logic
Data
Container
Shopping Cart
Static Content
Tracking
Recommandations
Core
Container Container

9. Construction manual
Proxy (+Load Balancing)
= top level resource
service service service
service service
Database
(may also be distributed)
Messaging (async)

10. Hands on example
live diagramming o/

11. Questions?

12. The end
sources + further reading:
http://www.slideshare.net/adriancockcroft/goto-berlin
http://www.infoq.com/news/2014/11/gotober-wunderlist-microservices
http://www.infoq.com/presentations/migration-cloud-microservices
http://martinfowler.com/articles/microservices.html
https://www.youtube.com/watch?v=-5QEnbpFp3Q
https://www.youtube.com/watch?v=BiFaBEOty8c