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A snapshot of the summary - DEVOPS A BUSINESS PERSPECTIVE
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1 What is DevOps?
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1.1 Origins
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Name two reasons for DevOps to appear.
- Adoption of agile software development
- Management of IT infrastructure as a program code.
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1.1.1 Agile methods for software development
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Describe the historical developments for software development.Waterfall to Scrum to Agile
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Describe the waterfall methodA software development method of sequential execution of predetermined stages, each of which takes significant time and ends with the achievement of previously agreed results.
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What is the disadvantage of the waterfall method?It takes a long time to make the product
Changes in the product due to added customer requirements, market opportunities are difficult. -
Kent Beck wrote a book aboutXP Extreme Programming.
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Scrum and XP where not the solution for improving the development cycle. Why?Scrum and XP focused on the programming not on the whole development cycle.
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What are the key elements of agile development?
- Closer interaction between the customer and developer
- reduction of batch size
- product delivered at short intervals
- limited size of the teams
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Why is the effect of the Agile approach not a great as expected?
- Business needs not clear or well elaborated, prioritization
- The fragile state of the IT infrastructure
- Lack of obsolescence of the IT systems documentation
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1.1.2 Managing infrastructure as code
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Which two technologies made management of IT infrastructure as code possible?Virtualization and cloud computing.
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What is a chroot?A chroot is a part of a Unix operating systems that changes the apparent root directory for the current running process and its children. A program that is run in such a modified environment cannot name (and therefore normally cannot access) files outside the designated directory tree. The term "chroot" may refer to the chroot(2)system call or the chroot(8) wrapper program.
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