Saturday, 14 March 2020

What is DevOps? The Ultimate Guide to DevOps







The Ultimate Guide to DevOps in 3 Foundational Concepts

Are you trying to get a better handle on what is DevOps? Here are the three foundational concepts you have to know!
DevOps has become an overloaded buzzword that means a lot of different things to a lot of people. That's a challenge when you are trying to understand what DevOps is or define DevOps. Instead of trying to define DevOps, we are going to describe the foundational concepts that different people associate with DevOps and the history of how the DevOps movement evolved to help you get a holistic view:

1. Where Did DevOps Come From?

DevOps is the offspring of agile software development – born from the need to keep up with the increased software velocity and throughput agile methods have achieved. Advancements in agile culture and methods over the last decade exposed the need for a more holistic approach to the end-to-end software delivery lifecycle. 
What is Agile Software Development?
Agile Development is an umbrella term for several iterative and incremental software development methodologies. The most popular agile methodologies include Scrum, Kanban, Scaled Agile Framework® (SAFe®), Lean Development and Extreme Programming (XP).
While each of the agile methodologies is unique in its specific approach, they all share a common vision and core values (see the Agile Manifesto). They all fundamentally incorporate iteration and the continuous feedback that it provides to successively refine and deliver a software system. They all involve continuous planning, continuous testing, continuous integration, and other forms of continuous evolution of both the project and the software. They are all lightweight, especially compared to traditional waterfall-style processes, and inherently adaptable. And what is most important about agile methods is that they all focus on empowering people to collaborate and make decisions together quickly and effectively.
In the beginning, agile teams were primarily made up of developers. As these agile teams became more effective and efficient at producing software, it became clear that having Quality Assurance (QA) and Dev as separate teams was inefficient. Agile grew to encompass QA in order to increase the velocity of delivering software and now agile is once again growing to encompass the delivery and support members to extend agility from ideation to delivery.
The DevOps ideals extend agile development practices by further streamlining the movement of software change thru the build, validate, and deploy and delivery stages, while empowering cross-functional teams with full ownership of software applications – from design thru production support.
DevOps is an IT mindset that encourages communication, collaboration, integration and automation among software developers and IT operations in order to improve the speed and quality of delivering software.
DevOps teams focus on standardizing development environments and automating delivery processes to improve delivery predictability, efficiency, security and maintainability. The DevOps ideals provide developers more control of the production environment and a better understanding of the production infrastructure. DevOps encourages empowering teams with the autonomy to build, validate, deliver and support their own applications. With DevOps, nothing gets “thrown over the wall.” 

2. What Are the Challenges DevOps Solves?

Prior to DevOps application development, teams were in charge of gathering business requirements for a software program and writing code. Then a separate QA team tests the program in an isolated development environment, if requirements were met, and releases the code for operations to deploy. The deployment teams are further fragmented into siloed groups like networking and database. Each time a software program is “thrown over the wall” to an independent team it adds bottlenecks. The problem with this paradigm is that when the teams work separately:
  • Dev is often unaware of QA and Ops roadblocks that prevent the program from working as anticipated.
  • QA and Ops are typically working across many features and have little context of the business purpose and value of the software.
  • Each group has opposing goals that can lead to inefficiency and finger pointing when something goes wrong.
DevOps addresses these challenges by establishing collaborative cross-functional teams that share responsibility for maintaining the system that runs the software and preparing the software to run on that system with increased quality feedback and automation issues.
A Common Pre-DevOps Scenario
The Dev team that has a goal to ship as many features as possible, kicks a new release “over the wall” to QA. Then the tester’s goal is to find as many bugs as possible. When the testers bring their findings to Dev, the developers become defensive and blame the testers that are testing the environment for the bugs. The testers respond that it isn’t their testing environment, but the developer’s code that is the problem.
Eventually the issues get worked out and QA kicks the debugged new release “over the wall” to Ops. The Ops team’s goal is to limit changes to their system, but they apprehensively release the code and the system crashes. The finger pointing resumes.  
Ops says that Dev provided them faulty artifacts. Dev says everything worked fine in the test environment. The fire drills begin to debug the system and get production stable. The production environment isn’t Dev’s and QA’s responsibility, so they keep hands off while Ops spends all night fixing the production issues. 

3. What Is the Goal of DevOps?

Improve collaboration between all stakeholders from planning through delivery and automation of the delivery process in order to:
  • Improve deployment frequency
  • Achieve faster time to market
  • Lower failure rate of new releases
  • Shorten lead time between fixes
  • Improve mean time to recovery
According to the 2015 State of DevOps Report, “high-performing IT organizations deploy 30x more frequently with 200x shorter lead times; they have 60x fewer failures and recover 168x faster.”
A Common Pre-DevOps Scenario The software team meets prior to starting a new software project. The team includes developers, testers, operations and support professionals. This team plans how to create working software that is ready for deployment.
Each day new code is deployed as the developers complete it. Automated testing ensures the code is ready to be deployed. After the code passes all the automated testing it is deployed to a small number of users. The new code is monitored for a short period to ensure there are no unforeseen problems and it is stable. The new code is then proliferated to the remaining users once the monitoring shows that it is stable. Many, if not all, of the steps after planning and development are done with no human intervention.

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