Devops Lifecycle

1. Continuous Development

This phase involves the planning and coding of the software.
The vision of the project is decided during the planning phase.
The developers begin developing the code for the application.
here are no DevOps tools that are required for planning, but there are several tools for maintaining the code.

The developers require to commit changes to the source code more frequently. This may be on a daily or weekly basis.
Then every commit is built, and this allows early detection of problems if they are present.
- Building code is not only involved compilation, but it also includes unit testing, integration testing, code review, and packaging.
The code supporting new functionality is continuously integrated with the existing code. Therefore, there is continuous development of software.

Continuous Integration

Jenkins
- Jenkins is a popular tool used in this phase.
- Whenever there is a change in the Git repository, then Jenkins fetches the updated code and prepares a build of that code, which is an executable file in the form of war or jar.
- Then this build is forwarded to the test server or the production server.

The developed software is continuously testing for bugs.
Automation testing tools such as TestNG, JUnit, Selenium, etc are used.
These tools allow Quality Assurances to test multiple code-bases thoroughly in parallel to ensure that there is no flaw in the functionality.
In this phase, Docker Containers can be used for simulating the test environment.
Selenium does the automation testing, and TestNG generates the reports.
The entire testing phase can automate with the help of a Continuous Integration (Jenkins).

Continuous monitoring is a technology and process that IT organizations may implement to enable rapid detection of compliance issues and security risks within the IT infrastructure.
Monitoring is the phase where important information about the use of the software is recorded and carefully processed to find out trends and identify problem areas.
It may occur in the form of documentation files or maybe produce large-scale data about the application parameters when it is in a continuous use position. The system errors such as server not reachable, low memory, etc are resolved in this phase. It maintains the security and availability of the service.

The application development is consistently improved by analyzing the results from the operations of the software.

In this phase, the code is deployed to the production servers. Also, it is essential to ensure that the code is correctly used on all the servers.
The new code is deployed continuously, and configuration management tools play an essential role in executing tasks frequently and quickly.
Some popular tools which are used in this phase, such as Chef, Puppet, Ansible, and SaltStack.
Containerization
- Containerization tools are also playing an essential role in the deployment phase. Vagrant and Docker are popular tools that are used for this purpose.
- Containerization tools help to produce consistency across development, staging, testing, and production environment. They also help in scaling up and scaling down instances softly.
- Containerization tools help to maintain consistency across the environments where the application is tested, developed, and deployed.
- There is no chance of errors or failure in the production environment as they package and replicate the same dependencies and packages used in the testing, development, and staging environment.
- It makes the application easy to run on different computers.

Continuous Deployment

All DevOps operations are based on the continuity with complete automation of the release process and allow the organization to accelerate the overall time to market continuously.