Continuous Integration / Continuous Deployment, the fundamentals for DevOps

David Smith
23 ngày trước
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Various stages of app development often demand some amount of automation, which is directly linked to the efficiency of the delivery process of the app to the final consumer. Continuous integration and continuous deployment (CI/CD) are methods that help in the delivery of apps by introducing such automation. At its core, CI/CD is a method that involves resolving issues that crop up when integrating new code during the development process. CI/CD involves comprehensive monitoring as well as automation of processes during the entire lifecycle of application development or the DevOps lifecycle and is primarily required by the development and operations department of the organisation.

Continuous Integration

CI stands for Continuous Integration in DevOps services. It is the process under which changes to the code used to build the app are continuously tested and merged in a repository which is shared with all other collaborators who are a part of DevOps services. It is an automation process for the code and should, once completed, not require any further human intervention. The reason continuous integration is required is that if the aforementioned information is not continuously shared, it risks having a significant number of branches of the same DevOps services taking place by different people and worse, at different places. Merging and accommodating code changes then becomes a very time consuming and difficult process, and continuous integration helps avoid and bypass it.

Continuous Delivery/Deployment

In DevOps services, CD stands for Continuous Delivery or Continuous Deployment. These terms refer to different concepts and processes in the DevOps lifecycle but are very often used interchangeably for one another. Continuous delivery deals with the problem of a communication gap emerging between the developers of the application and the operations team. Under Continuous Delivery, all changes to the code are tested for errors and bugs regularly and are then pushed to the repository from where the operations team may take over for deployment. If Continuous Delivery is used, the deployment of code becomes a significantly easier and more hassle-free process in the DevOps lifecycle. Under Continuous Deployment, the processes after delivery are taken care of. The changes made by the developer in the code are continuously released to production, which is the final stage where these changes are accessible to the users of the application. There are no intermediate checks between development and production DevOps services, and the process is fully automated. The main advantage of Continuous Deployment is the fact that the operations team does not need to go through the tedium of checking and rechecking every piece of code repeatedly before production. Automation helps them focus on processes in the DevOps lifecycle that necessarily require human intervention.

Steps to Implement CI/CD -

Setting Up Integration

In DevOps services, Continuous Integration is difficult to set up, particularly since it is a part of the initial phase of the DevOps lifecycle. However, the entire operation of setting up Continuous Integration can be compressed into no more than a few steps. Firstly, the code needs to be written by the developer for the purpose required. The code should conform to the guidelines set by the customer. If there are no such guidelines, the knowledge and competencies of all developers must be kept in mind before deciding the syntax and style of writing the code. Next, the code needs to be pushed to the repository by the developer. The repository is ideally shared by all the DevOps services personnel working on the application. The code, once it has been uploaded to the repository, is tested. This is an automatic process and accounts for all errors in syntax as well as operation. In Continuous Integration, this process does not require any human intervention. Next, these errors are sent back to the developer. If errors are received in the code, the developer is supposed to consider them a priority. They must be rectified and the code uploaded to the repository as soon as possible. This cycle continues until the code is completely error-free.

Setting Up Delivery and Deployment

Once the repository tests have been cleared, the code moves on to the tests of staging and performance, as a part of the CD stage of the DevOps lifecycle. It is essential to automate this testing, and these tests must be able to output whether the application works well on the platform as well as integrates well with it. As an extra step, user samples may be used to confirm the results of the testing. If your DevOps lifecycle contains a Continuous Deployment pipeline, the application will be deployed for end-users as soon as these tests have been cleared. If a Continuous Deployment capability is not present, the application will be added to the deployment queue to be deployed manually by the designated developer.

As a caveat, it is always important to keep monitoring your applications even after they have been deployed. Just as the application code can contain errors, so can the testing code, leaving some errors unresolved. Hence, keeping on analyzing the performance of your code can pay rich dividends.




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