DevOps

Why Automated Testing is Essential for CI/CD?

- Automated testing allows us to execute tests in parallel, across multiple servers/containers, speeding up the testing process - There is more consistency in automated testing. Automation ensures that software behaves the way it is expected to and reduces human errors or bias. - In a CI/CD pipeline, tools and frameworks have to be adjusted quickly to meet changing demands. Manual testing makes it tough to update and be agile. For example, if you switch to a new CI server platform, the entire manual testing process has to be reinitiated. When you have automated tests, however, most of the configuration is done automatically. As a result, you can migrate to new environments quickly - Maximizing workforce is crucial in a development project. Repetitive testing steps, when automated, free up the engineers to focus on other high-value tasks When changes are small in a CI/CD pipeline, they still need all the effort that goes into testing. Automated testing works well to validate minor changes continuously.

Continuous Testing (CT)

- Connuous tesng (CT) is like an armor in the CI/CD pipeline process. It buffers the developers by squashing bugs. It ensures that end-user experience remains uncompromised no maer how many releases happen. - CT can also be called a safety net, as it protects the end user experience in spite of accelerated processes. - Since it is a continuous process, it cannot be tagged at the end, but needs to be seamlessly interwoven into the software delivery pipeline. - It establishes a stable test environment with valid test data at all stages of development - Tests should be wide to adapt to an application's change, which affects functionality.

DevOps benefits?

- Improves quality and time for innovation - Treats infrastructure as code - Ensures smaller and faster deployments, ensuring faster time-to-market - Improves ROI, the key to any business success - Mitigates risk by reducing time to delivery - Identifies problems and provides smooth and effective resolution

How DevOps tools work together?

- Version Control System software such as Git etc. manage the source code. - This code is committed to the Git repository by developers and any modifications made to the code are committed to this repository. - Jenkins uses the Git plugin to take this code out of the repository and build it using software like Ant or Maven. - Configuration management software such as puppet deploy and test environment provisions and then Jenkins releases this code on the test environment in which testing is conducted using tools such as selenium. - When the code has been tested, Jenkins sends it to the production server for deployment (even production servers are provided and managed by resources such as puppets). - It is continuously tracked by tools like Nagios after deployment. - Docker containers provide the test environment for testing the build features.

Tools used for DevOps?

- Version Control System tool: Git, Bitbucket, SVN, Mercurial, CVS - Continuous Integration tool: Jenkins, Teamcity, Bamboo, Hudson - Continuous Testing tool: Junit, TestNG, Selenium - Configuration Management and Deployment tools: Puppet, Chef, Ansible, Docker, uDeploy - Continuous Monitoring tools: Splunk, ELK Stack, Kibana, Nagios - Containerization tool: Docker

Ansible in DevOps?

Ansible is the most popular DevOps open source tool for IT Configuration Management, Deployment & Orchestration. This tool is easy to use while still being powerful enough to automate complex multi-tier IT application environments.

Continuous Integration (CI)

Continuous Integration (CI) is a software process in which developers often incorporate their code changes into a main code repository, triggering an automatic build and allowing teams to find bugs early in the development cycle, fix them, and test iteratively. Depending on the size of the development team, these multiple builds could be running in parallel. Shorter build times lead to developer creativity that can breed innovation.

What is CI-CD?

Continuous Integration and continuous Delivery (CI/CD) is a set of software practices and techniques that enable the frequent release of small batches of code changes, with extensive visibility and traceability. It typically involves the creation of a largely automated pipeline that orchestrates the build, test and deployment of software across staged environments, ultimately leading to deployment in production.

What are DevOps benefits?

DevOps is a pure Developer-Operations collaboration that provides improved process delivery, enhanced business agility and efficient integration for enterprise of any size. Below are Key DevOps Benefits : - Improves quality and time for innovation - Treats infrastructure as code - Ensures smaller and faster deployments, ensuring faster time-to-market - Improves ROI, the key to any business success - Mitigates risk by reducing time to delivery - Identifies problems and provides smooth and effective resolution

What are benefits of CI-CD?

Faster identification and resolution of defects : CI/CD allows an elegant way to establish the appropriate quality gates in the development and testing process. A fast feedback loop to the developers ensures that bugs are addressed early in the development cycle Reduced overhead cost : Finding a bug at the development stage is the cheapest possible way to find it. If the same bug was to be fixed in any other environment, it would cost more. CI/CD requires some upfront overhead cost, but these are more than offset by the time and expense saved along the way. Better quality assurance : CI/CD enables QA teams to release deployable software at any point in time. Without it, projects are prone to delayed releases because of unforeseen issues which arise at any point in the traditional development and test process. Reduced assumptions : CI/CD replaces testing assumptions with knowledge, thereby eliminating all cross-platform errors at the development stage. Faster time to market : Faster test and QA cycles enable organizations to get quality products and services to market faster and more efficiently. Software health measurability : By establishing continuous testing into the automated integration process, software health attributes such as complexity can be tracked over time. Better project visibility : Frequent code integration provides the opportunity to identify trends in build success and failure and make informed decisions to address them. With CI/CD, dev and test teams can access real-time data on the code quality metrics to innovate new improvements and support decisions.

Continuous Deployment (CD)

Fully Automated Pipeline : Continuous deployment takes continuous delivery a step further. So that any change that passes through all stages of your production pipeline is released to your customers using this method. no need for human interference, and only a failed test can prevent a new change from going into production.

Why is DevOps important?

Organizations have to redesign their product deployment processes in today's digitalised environment to be more stable and agile to keep up with the competition. DevOps plays a key role in creating versatility and agility for the entire pipeline of software development, from design to implementation and to end-users. DevOps is the solution for the continuous updating and enhancement of goods to bring together a more streamlined and efficient operation.

Continuous Delivery (CD)

Single Click Deployment : Continuous delivery is an extension of continuous integration that ensures you can efficiently and sustainably deliver new updates to your customers. which allowing you to deploy your app at any time by simply clicking a button.

DevOps' core functions?

Software development : - Code building - Code coverage - Unit testing - Packaging - Deployment Infrastructure : - Provisioning - Configuration - Orchestration - Packaging - Deployment

DevOps vs Agile Process

While agile software development focuses on the collaboration between the business and its developers, DevOps focuses on collaboration between developers, IT operations and security teams. Agile software development provides business agility, while DevOps provides IT agility, enabling the deployment of reliable and predictable applications with shorter release cycles. DevOps can be termed as 'complementary' to agile software development, as it extends continuous integration and continuous release by making the code 'production-ready with high value to customer'. The goal of DevOps is to successfully deploy features into production without causing any disruption to other services, while quickly detecting and correcting incidents as and when they occur during the DevOps lifecycle.