EuroPython 2019: Modern Continuous Delivery for Python Developers

Deployment automation, cloud platforms, containerization, short iterations to develop and release software—we’ve progressed a lot. And finally it’s official: Kubernetes and OpenShift are the established platforms to help us do scaling and zero downtime deployments with just a few hundred lines of YAML. It’s a great time.

Can we finally put all our eggs into one basket? Identify the cloud platform that fits our needs, and jump on it? That could well backfire: Vendor lock-in is the new waterfall, it slows you down. In future you’ll want to jump over to the next better platform, in a matter of minutes. Not months.

This talk is about The Art of Writing deployment pipelines that will survive Kubernetes, OpenShift and the like. It’s for Python developers and Kubernetes enthusiasts of all levels – no domain specific knowledge required, all you need to understand will be explained. You’ll learn how to separate application-specific and deployment-specific configuration details, to maximize your freedom and avoid vendor lock-in.

Come see a demo of a Django project setup that covers everything from local development to automatic scaling, flexible enough to be deployed on any of your favorite container platforms. Take home a working, future-proof setup for your Python applications.

See the original presentation at https://slides.com/bittner/modern-continuous-delivery/

Transcript

1. Modern Continuous Delivery
   Modern Continuous Delivery
   “ deploy to production
   deploy to production
   from commit #1
   from commit #1
   

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2. Peter Bittner
   Peter Bittner
   Developer
   Developer
   of people, companies and code
   of people, companies and code
   @peterbittner, django@bittner.it
   behave-django
   pyclean
   djangocms-maps
   ansible-role-software
   django-probes
   django-apptemplates
   codeship-yaml
   django-organice
   PythonTurtle
   painless/tox
   django-bootstrap-static
   

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3. Continuous Delivery
   Continuous Delivery
   “ a set of practices and principles in software engineering
   aimed at building, testing, and releasing software
   safely, faster, more frequently, and in a sustainable way.
   Source: painless.software/continuous-delivery
   

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4. Continuous Delivery
   Continuous Delivery
   “ a set of practices and principles in software engineering
   aimed at building, testing, and releasing software
   safely, faster, more frequently, and in a sustainable way.
   “ the goal is to put the release schedule
   in the hands of the business, not in the hands of IT.
   Source: painless.software/continuous-delivery
   

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5. Continuous Delivery
   Continuous Delivery
   “ a set of practices and principles in software engineering
   aimed at building, testing, and releasing software
   safely, faster, more frequently, and in a sustainable way.
   “ the goal is to put the release schedule
   in the hands of the business, not in the hands of IT.
   Source: painless.software/continuous-delivery
   ??
   ??
   Continuous
   Continuous
   integration
   integration
   

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6. Continuous Delivery
   Continuous Delivery
   “ a set of practices and principles in software engineering
   aimed at building, testing, and releasing software
   safely, faster, more frequently, and in a sustainable way.
   “ the goal is to put the release schedule
   in the hands of the business, not in the hands of IT.
   Source: painless.software/continuous-delivery
   ??
   ??
   Continuous
   Continuous
   integration
   integration
   ??
   ??
   Continuous
   Continuous
   deploym
   ent
   deploym
   ent
   

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7. Modern?
   Modern?
   

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8. Modern?
   Modern?
   Immutable infrastructure
   Immutable infrastructure
   

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9. Modern?
   Modern?
   Immutable infrastructure
   Immutable infrastructure
   Container orchestration
   Container orchestration
   

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10. Modern?
    Modern?
    Immutable infrastructure
    Immutable infrastructure
    Container orchestration
    Container orchestration
    Version control + automation
    Version control + automation
    

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11. Modern?
    Modern?
    Immutable infrastructure
    Immutable infrastructure
    Container orchestration
    Container orchestration
    Version control + automation
    Version control + automation
    Cloud-native applications
    Cloud-native applications
    

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12. Choice or Lock-in?
    Choice or Lock-in?
    

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13. 1. Clean code
    1. Clean code
    2. Deploy to production
    2. Deploy to production
    from commit #1
    from commit #1
    There must be a better way!
    There must be a better way!
    

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14. Demo
    Demo
    

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15. Responsibility Layers
    Responsibility Layers
    

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16. Responsibility Layers
    Responsibility Layers
    Application
    Application
    

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17. Responsibility Layers
    Responsibility Layers
    Application
    Application
    Development
    Development
    

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18. Responsibility Layers
    Responsibility Layers
    Application
    Application
    Development
    Development
    Deployment
    Deployment
    

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19. Responsibility Layers
    Responsibility Layers
    Application
    Application
    Development
    Development
    Deployment
    Deployment
    Automation
    Automation
    

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20. Application
    Application
    One environment!
    12-factor app.
    Build with features.
    Compose in environments.
    1
    1
    

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21. Development
    Development
    Make it easy!
    Standard practices.
    No comprehensive instructions.
    Simple & user-friendly!
    3
    3
    

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22. Deployment
    Deployment
    Make it beautiful!
    Easy to explain.
    Generate + seal your secrets,
    or seal + commit your secrets.
    2
    2
    

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23. Automation
    Automation
    Keep it simple!
    What you would do manually.
    Tell a story!
    ASAP
    4
    4
    

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24. ASAP!
    ASAP!
    as simple as possible
    as simple as possible
    

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25. Deploy to production!
    Deploy to production!
    often + from commit #1
    often + from commit #1
    

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26. Iterate!
    Iterate!
    ... and improve
    ... and improve
    

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27. Agile, please.
    Agile, please.
    test-driven, pair-programming
    test-driven, pair-programming
    

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28. Free your software
    Free your software
    no secrets, no security holes
    no secrets, no security holes
    

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29. “ The only way to go fast
    The only way to go fast
    is to go well.
    is to go well.
    --- Robert C. Martin
    Source: , 2015
    Technology and Friends, Episode 354
    

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30. Thank you!
    Thank you!
    for your precious time
    for your precious time
    Painless Software
    Painless Software
    Less pain, more fun.
    

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31. Beautiful is better than ugly.
    Explicit is better than implicit.
    Simple is better than complex.
    Complex is better than complicated.
    Flat is better than nested.
    Sparse is better than dense.
    Readability counts.
    Special cases aren't special enough
    to break the rules.
    Although practicality beats purity.
    Pythonistas Oath
    Pythonistas Oath
    1
    1
    

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32. Errors should never pass silently.
    Unless explicitly silenced.
    In the face of ambiguity, refuse
    the temptation to guess.
    There should be one­­ only one ­­obvious way
    to do it.
    Although that way may not be obvious
    at first sight.
    Pythonistas Oath
    Pythonistas Oath
    2
    2
    

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33. Now is better than never.
    Although never is often better
    than *right* now.
    If the implementation is hard to explain,
    it's a bad idea.
    If the implementation is easy to explain,
    it may be a good idea.
    Pythonistas Oath
    Pythonistas Oath
    3
    3
    

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34. Continuous delivery is
    a honking great idea.
    If you deploy to production
    from commit #1.
    Let's do it! ­­ I start today.
    Pythonistas Oath
    Pythonistas Oath
    4
    4
    Python
    

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