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The Necessity of Configuration and System Management Tools What They Are and Why We Need Them

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@m_holtermann • github.com/MarkusH • markusholtermann.eu Hi, I’m Markus Holtermann ⚫ Django Core Developer ⚫ CS MSc Student

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@m_holtermann • github.com/MarkusH • markusholtermann.eu Hi, I’m Markus Holtermann ⚫ Django Core Developer ⚫ CS MSc Student

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Evaluating Methods to Maintain System Stability and Security When Reversing Changes Made by Configuration and System Management Tools in UNIX Environments

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Who of You Maintains One or More Servers?

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Who of You Uses Configuration or System Management Tools?

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Who of You Has a Backup Restore Plan to Recover After a Fault?

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How Long Do You Think It Takes, Until a 400 Million USD Company With 20 Billion USD Daily Trades Is Bankrupt?

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Classification of Configuration Management

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1. No systematic Configuration Management

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2. Divergent Configuration Management

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3. Convergent Configuration Management

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4. Congruent Configuration Management

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Classification of IT Resources

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Rules Derived From Classification

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Rule 3: Estimate Downtime and Check Dependencies

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Rule 6: Use Environment-Wide Unique Identifiers

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Rule 7: Review Depending Resources

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Rule 9: Prune Files and Folders With Package Manager

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Example: Restoring VM Backups

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Bankrupt In 45 Minutes?! “Knightmare: A DevOps Cautionary Tale” by Doug Seven

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What Happened?

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How to Prevent It?

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Use Configuration and System Management Tools

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Automate As Much As Possible

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Checklists Are No Deployment Tools!

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Keep Track of Dependencies!

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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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Example: Update of a Django Project

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

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

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

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

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

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How to Solve It?