CI/CD is a method to deliver apps to customers continuously by automatizing the stages of app development. It stands for Continuous Integration (CI) and Continuous Delivery (CD).
Successful CI means integrating new code changes into a shared repository regularly. CI enables developers to identify errors early in the software/app development lifecycle.
CD picks up where CI ends. It’s an efficient method to deliver code changes to selected environments (for example app testing or production environments).
CI/CD is one of the major benefits of migrating from a monolithic architecture to microservices. When service components of a system are decoupled, developing an app can be done faster as each app has its own CI/CD cycle and teams can develop their products without having to interfere with other teams/apps.
Monitoring can also be implemented for each app/service to give a better observability for each component.
CI/CD pipeline is a series of steps that need to be taken to deliver a new version of an app or software. This process is automated to ensure:
Minimizing manual errors
Swift product iterations
Structured feedback loops
The CI/CD pipeline enables developers to write code, build tests and deploy changes to the app/software coordinately and deliver results in no time.
Generally, the CI/CD pipeline consists of four stages:
Source: The first stage is creating a source code. Once the source code is created, any change in the source code repository can trigger a CI/CD pipeline.
Build: During this stage, source codes are pulled from a repository and linked to libraries and modules. These components are then built into an executable file.
Test: Automated tests are carried out to check the correctness of the code. Testing ensures new features are deployable and they don’t break features already working.
Deploy: Once the code passes all tests, it’s ready to be deployed in a deployment environment. Most developers prefer to use reporting tools to detect potential post-deployment errors.
CI/CD tools help DevOps teams automate their development and testing processes. Some of these tools support developers in the integration phase while others help them implement the delivery or deployment smoothly.
One of the most popular CI/CD tools is the open source automation server Jenkins. By automating the processes related to building, testing and deploying a software/app component, Jenkins facilitates CI/CD. Other open source CI/CD tools include:
Tekton: An open-source framework for creating CI/CD systems, allowing DevOps teams to build, test, and deploy across cloud providers and on-premise systems.
Spinnaker: It’s able to integrate into major cloud providers, allowing developers to deploy software/app changes in real time.
Travis CI: Using this tool, developers can test their codes in a few minutes.
Check out Talon.One’s ebook, “The A to Z of Microservices Architecture” to learn more about CI/CD and its role in the tech stack of a business.
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