The Necessity of Configuration and System Management Tools

Transcript

1. The Necessity of Configuration and System Management Tools What They

   Are and Why We Need Them

2. @m_holtermann • github.com/MarkusH • markusholtermann.eu Hi, I’m Markus Holtermann ⚫

   Django Core Developer ⚫ CS MSc Student

3. @m_holtermann • github.com/MarkusH • markusholtermann.eu Hi, I’m Markus Holtermann ⚫

   Django Core Developer ⚫ CS MSc Student

4. Evaluating Methods to Maintain System Stability and Security When Reversing

   Changes Made by Configuration and System Management Tools in UNIX Environments

5. Who of You Maintains One or More Servers?

6. Who of You Uses Configuration or System Management Tools?

7. Who of You Has a Backup Restore Plan to Recover

   After a Fault?

8. How Long Do You Think It Takes, Until a 400

   Million USD Company With 20 Billion USD Daily Trades Is Bankrupt?

9. Classification of Configuration Management

10. 1. No systematic Configuration Management

11. 2. Divergent Configuration Management

12. 3. Convergent Configuration Management

13. 4. Congruent Configuration Management

14. Classification of IT Resources

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23. Rules Derived From Classification

24. Rule 3: Estimate Downtime and Check Dependencies

25. Rule 6: Use Environment-Wide Unique Identifiers

26. Rule 7: Review Depending Resources

27. Rule 9: Prune Files and Folders With Package Manager

28. Example: Restoring VM Backups

29. Bankrupt In 45 Minutes?! “Knightmare: A DevOps Cautionary Tale” by

    Doug Seven

30. What Happened?

31. How to Prevent It?

32. Use Configuration and System Management Tools

33. Automate As Much As Possible

34. Checklists Are No Deployment Tools!

35. Keep Track of Dependencies!

36. Thank You! Master’s Thesis: https://goo.gl/lO5Fv8 @flyingcircusio • bitbucket.org/flyingcircus • flyingcircus.io

    @m_holtermann • github.com/MarkusH • markusholtermann.eu
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38. Example: Update of a Django Project

39. Current Stack Django>=1.4,<1.5 Python>=2.6,<2.7

40. Just Updating Django Django>=1.8,<1.9 Python>=2.6,<2.7

41. Incompatibilities Between Django and Python Django>=1.8,<1.9 Python>=2.6,<2.7

42. Ensure Version Support Between Dependencies Django>=1.8,<1.9 Python>=2.7,<2.8 Python3>=3.2,<3.5

43. Another Project Fails Now Django>=1.8,<1.9 Django>=1.4<1.5

44. How to Solve It?