All My Tests Are Passing, Now What?

•

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Christopher Read

Technologie

All My Tests Are Passing
Now What?
Chris.Read@ThoughtWorks.com

Software has no value
outside of production...

• No matter how clean the
code

• No matter how clean the
server room

...but most software is
built to pass QA
• Developers sometimes
don’t even understand
what production will
look like

• Conﬁguration reﬂects
development
environment

Where does our
software need to run?

• So where does code go
after all your tests pass?

Developer
Workstations

• Often the sweet spot
• High rate of change in all directions
• Need to get up and running quickly

Continuous Integration

• Unit testing
• Functional testing
• Integration testing
• Stubbed
• Mocked

Integration

• Lots of endpoints (hopefully all of them)
• Does my app play nice with others?

Performance

• Scaling
• Responsiveness
• Does my app meet performance criteria?

Formal Acceptance

• Sign off the stories...

Production

• Yay! We’re live at last! All done...

Disaster Recovery

• ... not done yet!
• DR often has a few subtle differences

Different types of
conﬁguration

• Environments are
different

• Different owners

• Different rates of change

Developer Centric

• Spring Wiring
• ORM Models
• It’s actually code!

Environment Speciﬁc

• Hostnames
• Passwords
• Connection Strings

Application Centric

• Pool sizes
• Memory sizes
• Timeouts

Operator Centric

• Logging
• Alerting
• Monitoring
• Housekeeping

Conﬁg Management
Maturity Model

• How do people manage
it now?

CMMM 0

• Don’t understand the distinction between
conﬁguration and code
• “Just edit stuff in production until it works”

CMMM I
• Manual Installation
• Manual Conﬁguration
• Massive Release Notes

• Slow
• Error Prone

CMMM II
• Hard Coded Conﬁguration
• Build per environment
• Conﬁguration in SCM with code

• What’s tested is not what gets to
production

CMMM III
• Conﬁguration in separate SCM
• Automated conﬁguration at deploy time
• One package for all environments

• Forked conﬁguration - missing and/or
deprecated entries

CMMM IV
• LDAP/DNS/JNDI
• Puppet/Chef/SMS
• Focussed on machine level conﬁg, not app

• Hard to administer
• Hard for developers to view and use

CMMM V ?

• Conﬁguration Repository
• Cross Platform
• Language Independent
• Encrypt Sensitive Values
• Easy to populate, use and visualise

Summary

• Conﬁguration is hard
• Poor conﬁguration management (either too
much or too little) impacts software quality
• There’s a lot of room here to make things
better...

Patterns
• ConﬁgProvider

• Make sure it’s unit tested

• Test the template

• Test the dev machine conﬁg too!

• FailFast

• Esp for deps at startup

• Fails unit tests if dev machine conﬁg is not provided

• ConﬁgView

• DNS Service Names

Escape

• http://code.google.com/
p/escservesconﬁg

• Open Source

• Apache2 Licensed

• Let’s try make things
better...

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All My Tests Are Passing, Now What?

1. All My Tests Are Passing Now What? Chris.Read@ThoughtWorks.com

2. Software has no value outside of production... • No matter how clean the code • No matter how clean the server room

3. ...but most software is built to pass QA • Developers sometimes don’t even understand what production will look like • Conﬁguration reﬂects development environment

4. Where does our software need to run? • So where does code go after all your tests pass?

5. Developer Workstations • Often the sweet spot • High rate of change in all directions • Need to get up and running quickly

6. Continuous Integration • Unit testing • Functional testing • Integration testing • Stubbed • Mocked

7. Integration • Lots of endpoints (hopefully all of them) • Does my app play nice with others?

8. Performance • Scaling • Responsiveness • Does my app meet performance criteria?

9. Formal Acceptance • Sign off the stories...

10. Staging • Let’s practice deployment

11. Production • Yay! We’re live at last! All done...

12. Disaster Recovery • ... not done yet! • DR often has a few subtle differences

13. All these places need Conﬁguration

14. Different types of conﬁguration • Environments are different • Different owners • Different rates of change

15. Developer Centric • Spring Wiring • ORM Models • It’s actually code!

16. Environment Speciﬁc • Hostnames • Passwords • Connection Strings

17. Application Centric • Pool sizes • Memory sizes • Timeouts

18. Operator Centric • Logging • Alerting • Monitoring • Housekeeping

19. Conﬁg Management Maturity Model • How do people manage it now?

20. CMMM 0 • Don’t understand the distinction between conﬁguration and code • “Just edit stuff in production until it works”

21. CMMM I • Manual Installation • Manual Conﬁguration • Massive Release Notes • Slow • Error Prone

22. CMMM II • Hard Coded Conﬁguration • Build per environment • Conﬁguration in SCM with code • What’s tested is not what gets to production

23. CMMM III • Configuration in separate SCM • Automated configuration at deploy time • One package for all environments • Forked configuration - missing and/or deprecated entries

24. CMMM IV • LDAP/DNS/JNDI • Puppet/Chef/SMS • Focussed on machine level conﬁg, not app • Hard to administer • Hard for developers to view and use

25. CMMM V ? • Conﬁguration Repository • Cross Platform • Language Independent • Encrypt Sensitive Values • Easy to populate, use and visualise

26. Summary • Conﬁguration is hard • Poor conﬁguration management (either too much or too little) impacts software quality • There’s a lot of room here to make things better...

27. Patterns • ConfigProvider • Make sure it’s unit tested • Test the template • Test the dev machine config too! • FailFast • Esp for deps at startup • Fails unit tests if dev machine config is not provided • ConfigView • DNS Service Names

28. Escape • http://code.google.com/ p/escservesconﬁg • Open Source • Apache2 Licensed • Let’s try make things better...

29. Q&A

All My Tests Are Passing, Now What?

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