Using Jenkins Pipeline for Continuous Integration and Deployment of PHP Applications

Jenkins is a widely used continuous integration and deployment tool that offers many plugins and features to simplify build and deployment processes, and Jenkins Pipeline, its latest plugin, lets users define CI/CD workflows using a full-featured DSL (Domain Specific Language).

For PHP applications, Jenkins Pipeline provides strong support for continuous packaging and deployment, and this article walks through the steps to build such a pipeline.

Preparation

Before starting, ensure the following preparations are completed:

Install and configure Jenkins according to the official documentation.

Install and configure required plugins: Pipeline (to support Jenkins Pipeline), Git (to pull code from a Git repository), PHP (to run PHP commands and scripts), Deploy to container (to deploy the PHP program to the target server).

Configure a Git repository to host the PHP source code and ensure access permissions.

Create Jenkins Pipeline

1. Open Jenkins' management page and create a new Pipeline project.

2. In the Pipeline configuration, set "Definition" to "Pipeline script from SCM".

3. Choose Git as the SCM and provide the repository URL.

4. Specify the path to the Jenkinsfile in the "Script Path" field; the Jenkinsfile defines the entire pipeline flow.

5. Save and apply the changes.

Write Jenkinsfile

The Jenkinsfile is the key file that defines the pipeline stages and steps. Below is a simple example:

pipeline {
    agent any

    stages {
        stage('Checkout') {
            steps {
                git 'https://github.com/example/repo.git'
            }
        }

        stage('Build') {
            steps {
                sh 'composer install'
            }
        }

        stage('Test') {
            steps {
                sh 'vendor/bin/phpunit'
            }
        }

        stage('Deploy') {
            steps {
                deploy adapters: [glassfish(credentialsId: 'credential-id', containerId: 'container-id', contextPath: '', war: '**/*.war')]
            }
        }
    }
}

The Jenkinsfile defines four stages: Checkout, Build, Test, and Deploy, each containing steps that perform specific build and deployment actions.

In the Checkout stage, the code is pulled from the Git repository; the Build stage runs composer install to install dependencies; the Test stage runs vendor/bin/phpunit for testing; the Deploy stage uses the Deploy to container plugin to push the built artifact to the target server.

Note that parameters such as credentialsId and containerId need to be configured according to your environment.

Run Jenkins Pipeline

After writing the Jenkinsfile, trigger the pipeline by clicking the "Build Now" button on the pipeline configuration page.

During the build, Jenkins follows the defined flow, executing each step sequentially. Build logs can be inspected to monitor progress and troubleshoot any issues.

When the build succeeds, the PHP application is packaged and deployed to the target server, and you can verify the deployment by accessing the server's URL.

Summary

Using Jenkins Pipeline streamlines and accelerates the continuous packaging and deployment of PHP applications. By defining a pipeline file and leveraging appropriate plugins, you can automate code checkout, dependency installation, testing, and deployment, enabling faster iteration, higher release quality, and improved development efficiency.