The entire process of building software is broken into small actionable blocks called sprints. WHEREIN an agile model, the product gets tested only in the developer computers and not on the prod systems and also the developers and operations team, work in a separate environment.
DevOps has become a buzzword that means a lot of different things to a lot of people. It is just a software development strategy(not a tool, not a framework, not a technology and also not only a job role) which bridges the gap between the Dev(developer) and Ops(operations) side of the company. It solves the conflicts such as when the Developer team wants agility and the Operation team wants stability bringing Dev and the ops side of the company together. It is a culture that promotes collaboration between the Developer and Operations Team to deploy code to production faster in an automated & repeatable way.
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. In the beginning, agile teams were originally made up of developers.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 were inefficient. Agile grew to encompass QA 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.
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The DevOps ideals extend agile development practices by further streamlining the movement of software change through the build, validate, and deploy and delivery stages while empowering cross-functional teams with full ownership of software applications — from design through production support.
A definition Jez Humble proposed is that DevOps is “ A cross-disciplinary community of practice dedicated to the study of building, evolving and operating rapidly-changing resilient systems at scale.”
The practical definition can go as,
“ DevOps is the practice of operations and development engineers participating together in the entire service life cycle, from design through the development process to production support “
Understanding DevOps is not possible without knowing DevOps life-cycle. Here is a piece of brief information about the Continuous DevOps life-cycle
In this DevOps stage, the development of software takes place constantly. In this phase, the entire development process is separated into small development cycles. This benefits the DevOps team to speed up software development and delivery process.
QA team use tools like Selenium to identify and fix bugs in the new piece of code.
In this stage, new functionality is integrated with the prevailing code, and testing takes place. Continuous development is only possible due to continuous integration and testing.
In this phase, the deployment process takes place continuously. It is performed in such a manner that any changes made any time in the code, should not affect the functioning of a high traffic website.
In this phase, the operation team will take care of the inappropriate system behavior or bugs that are found in production.
Need of DevOps
The need of DevOps depends completely on the scale of the project. If your purpose is to launch a minimum viable product(MVP) to test your idea, most likely you can live without DevOps systems. If your software has already reached several releases, and it is the time to start thinking about scale and competitiveness — think of DevOps.
Phases of DevOps
There are several phases to DevOps maturity. Before continuous integration, development teams would write a bunch of code for three to four months. Then those teams would merge their code to release it. The different versions of code would be so different and have so many changes that the actual integration step could take months. This process was very unproductive, Hence following CI/CD(again a buzzword) explained as follows :
Continuous integration is the practice of quickly integrating newly developed code with the main body of code that is to be released. Continuous integration saves a lot of time when the team is ready to release the code.
This term was not introduced by DevOps, Continuous integration is an agile engineering practice originating from the Extreme Programming methodology. The terms have been around for a while, but DevOps has adopted this term because automation is required to successfully execute continuous integration. Continuous integration is often the first step down the path. The continuous integration process from a DevOps perspective involves checking your code in, compiling it into usable (often binary executable) code and running some basic validation testing.
Continuous delivery is an extension of continuous integration. It sits on top of continuous integration. When administering continuous delivery, you add additional automation and testing so that you don’t just merge the code, but you get the code nearly ready to deploy with almost no human intervention. It’s the system of having the code base continuously in a ready-to-deploy state.