Automated deployment and rollback of PHP applications through Deployer
Introduction:
In the software development process, application deployment is a very important link. The traditional manual deployment method is not only time-consuming and labor-intensive, but also prone to human error. In order to improve deployment efficiency and reduce human errors, we can use automated deployment tools to achieve automated deployment and rollback. This article will introduce how to use Deployer to implement automated deployment and rollback of PHP applications.
1. What is Deployer?
Deployer is a PHP tool for automated deployment of applications. It is based on Shell script and SSH protocol and can perform various tasks on the remote server, such as code pulling, database migration, file permission setting, etc. It also supports cluster deployment and rollback functions of multiple servers.
2. Install Deployer
First, we need to install Deployer into the local development environment. It can be installed through Composer. The command is as follows:
$ composer require deployer/deployer --dev
3. Write the Deployer configuration file
Create a deploy.php file in the project root directory as the Deployer configuration file. In the configuration file, we can define various tasks and server cluster-related configurations.
Define Server
server('stage', 'example.com') ->user('deploy') ->identityFile('~/.ssh/id_rsa') ->set('deploy_path', '/var/www/stage.example.com');
In this example, we define a server named stage, specify the host name and user of the server, and the project directory on the server .
Define tasks
task('deploy', [ 'deploy:info', 'deploy:prepare', 'deploy:update_code', 'deploy:shared', 'deploy:writable', 'deploy:clear_paths', 'deploy:symlink', 'deploy:unlock', 'cleanup', 'success' ]);
In this example, we define a task named deploy, which includes subtasks of various deployment processes.
4. Execute deployment and rollback
Execute deployment
$ dep deploy stage
After executing the above command, Deployer will connect to the stage The server executes each sub-task defined in the deploy task to complete the application deployment process. You can view detailed log information during the deployment process and handle errors during the deployment process.
Perform a rollback
$ dep rollback stage
If a problem occurs during the deployment process, you can use the rollback command to roll back the application to the previous stable version. Deployer will connect to the stage server, perform rollback tasks, and restore the code and configuration files to their previous state.
5. Other functions and extensions
Deployer also provides many other functions and extensions that can be configured and used according to specific needs.
Conclusion:
With Deployer, we can easily implement automated deployment and rollback of PHP applications. It not only improves deployment efficiency but also reduces the occurrence of human errors. I hope this article can provide some help to everyone in realizing automated deployment.
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