Overview of Jenkins and Apache Groovy
Jenkins is an open-source automation tool written in java for continuous integration purposes. Jenkins gives out the complete view of the software development life cycle of the application, which starts from version control and goes till the packaging.Advantages of Using Jenkins
- Plug-in Availability
- Easily Configurable
- Jenkins supports the ability to build cloud-native applications
- Platform Independent
Groovy is giving its share is by offering its features of java compatible programming language which is mainly working on object-oriented functionality. As Jenkins is also focused on java, so they side by side are giving immense support so give out the best outcome.
Groovy helps in interacting with java objects and libraries which are getting managed by Jenkins. Most of the organizations and companies are getting dependent upon the continuous trio, i.e. continuous integration, continuous deployment, and continuous delivery. Pipeline as code means you are just briefing the entire flow of software development cycle in the form of code which could be managed and modified according to the business needs.
Jenkins Pipeline Execution Flow
1. This pipeline starts from the version control system, which helps to maintain the code followed by continuous integration.
2. The further proceeding includes the build phase, compile phase, testing and review. After continuous integration, we have continuous delivery which handles the delivery of the application to the test servers.
3. After this, the last but not the least is continuous deployment, which is having a duty to deploy the application to the production phase.
The delivery flexibility associated with the pipeline as code is beneficial as it allows the client to make their own decisions on when and how to deliver/deploy.
Implementing Pipeline as Code
1. Initialize the Jenkins after installing Jenkins into your Linux environment.
2. After this, you also have to initiate the docker as well by
systemctl start docker
3. As we also want to add groovy in our environment so for that add the groovy plugin in the Jenkins.
4. Now move forward to the
localhost:8180 to get access into the Jenkins where you will be asked for username and password.
5. Now your main task is to create jobs which include building the project, testing the project and then deploying the project and for every step we take we have to create a separate job for that.
- You can select the jobs from the dashboard and add them to the pipeline.
- But before adding them to the pipeline, you have to attach a version control system or repository with it, for example, git.
- Go to the configuration of jobs and go-to source code managing tab and select git.
- You have to follow this same process for every job.
6. After adding jobs to the repository.Execute the following steps –
- Add a source code.
- Go to configuration, move to the build tab and select the execute shell from the drop-down list and move to the command shell where you will add scripts.
- Each job is having scripts be it build phase, test phase and then followed by the deploy phase.
- In the test job you have to add the docker container while in the case of deploy job you have to cross-check whether the image is already created or no.
- Jenkins uses maven for installing packages which handle in taking care of all dependencies.
mvn install(will install the dependencies).
7. Now you have to connect all the jobs into a single pipeline so that all the jobs work in a continuum.
- Use post-build actions from the configuration of each job and add the next job associated with every post.
‘+’, after this choose for view name for providing the pipeline name.
- Use various options available and also mention the job should be the first job. (Select apply after that) and after that RUN.
8. Now to cross-check whether the pipeline is working or not.
A Comprehensive Approach
Jenkins offers easy configurations as per the requirements for continuous integration and continuous delivery, and helps to automate the software development process, to discover more about Jenkins we advise taking the subsequent steps –