The Necessity of Configuration and System Management Tools

https://markusholtermann.eu/2015/08/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
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
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?