Presentation from pywaw summit 2015.

1. Monolithic app to
microservices
transition is easy...
by Tomasz Choduń
.pywawsummit 25.05.2015

2. Need for changing
architecture

3. Need for changing architecture
● Let’s imagine that you have
really complex system and
you are just not able to
manage it anymore

4. Differences between
monolithic and micro
services architecture

5. Why monolithic application?
● easy to develop (one code
base),
● easy to deploy (no relations
with other applications),
● well known pattern

6. Why not?
● usually long-term commitment
to a technology stack,
● obstacle to scaling
development,
● poor fault isolation (one
misbehaving component can
bring down the entire system)

7. Why micro services?
● language agnostic,
● smaller pieces to learn and
understand,
● hard module boundaries,
● probably easier bringing a
great piece of software live on
an aggressive schedule

8. Why not?
● more moving parts,
● more infrastructure,
● more complexity for already
complex system

9. Changing architecture
challenges

10. Example transition

11. Infrastructure
● virtualization and containers
are your friends,
● automation is your best
friend!
● cost

12. Release and deployment
● dependencies control,
● version managing,
● deployment

13. Testing
● lot of test environments,
● lot of staging environments,
● how to perform good
integration tests?

14. Communication
● REST API (pyramid +
cornice + colander)
● “pipes API” (wimq,
WebInterpret internal library)

15. Communication
client = SomeClient()
client.register(app,
config_provider)
client.request_sth(data)

16. Communication
client = SomeClient()
client.register(app,
config_provider)
@client.consumer()
def receive_sth(data):
do_sth_with(data)

17. Questions?

18. Thank you!
www.webinterpret.com