1/7/2023 0 Comments Nodejs processIf a listener is added for this exception, the default action (which is to print a stack trace and exit) will not occur.Įmitted when the processes receives a signal such as SIGINT, SIGHUP, etc.Ĭreate a js file named main.js with the following code for listening for exit event −Ĭonsole.log('About to exit with code:', code) Normally, the node exits when there is no work scheduled, but a listener for 'beforeExit' can make asynchronous calls, and cause the node to continue.Įmitted when an exception bubbles all the way back to the event loop. This event is emitted when node empties its event loop and has nothing else to schedule. There is no way to prevent the exiting of the event loop at this point, and once all exit listeners have finished running, the process will exit. The process object is an instance of EventEmitter and emits the following events − Sr.No.Įmitted when the process is about to exit. There are several methods available in a process object. Herewith, it allows to perform a hot restart of your NodeJS processes, ensuring they are always available and are automatically restarted in the event of a failure.The process object is a global object and can be accessed from anywhere. js scripts and restarts the appropriate app to keep it up-to-date. It automatically monitors any code changes in the launched. Supervisor is a great solution to keep your applications running. the default file is used to launch the server.js application file as the “draw game” application). The appropriate config file reference) can be found by following the provided link (e.g. the default Hello Word application):Īlso, PM2 provides users the ability to create the configuration files where all the run options are listed, which is useful for microservice-based applications deployment, as several apps can be described in a single file. Next, you can remove this app with the pm2 delete command and deploy your own project (e.g. You can get acquainted with the list of commands for pm2, which can be executed directly via SSH.įor example, after Node.js server creation, you can list the running processes with the following command:Īs you can see it shows the default draw-game application is running. PM2 provides a huge variety of application management features, including the launched NodeJS processes monitoring. Refer to the official documentation for additional information. As a result, the script defined in “ start” of package.json is launched. The “ npm start” (which is the “ npm run start” alias) is performed if NPM is chosen as a value for the PROCESS_MANAGER variable on the NodeJS container. The platform provides four pre-configured process managers by default, which can be selected in the following ways:īy selecting the appropriate tag during the environment creation or container redeployīy editing the PROCESS_MANAGER Docker environment variable in the already created container(s) with the forever, npm, pm2 or supervisor value (restart is needed to apply the new options)īelow, we’ll consider each of the available managers to help you select one:Īlongside package management, the NPM provides the ability to start the application. Node.js process manager is a tool, which provides an ability to control application lifecycle, monitor the running services and facilitate common system admin tasks to maintain your project operability.
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