Discuss the problem of Pagoda pm2 automatically closing after opening nodejs

In recent years, with the rapid development of Internet technology, Node.js technology has increasingly become a popular option in web front-end technology. As a technology that can be used on both the front and back ends, Node.js plays an irreplaceable role in the development process. However, there are some problems when developing with Node.js. Among them, many people will encounter the problem of automatic shutdown after opening nodejs. This article mainly discusses this issue.

1. Problem background

During the development process, most of us are accustomed to using some tools to assist our development work, such as using personal servers to deploy applications. For developers who use servers to run applications, using Pagoda panels is a very useful way. Pagoda Panel is a server management software designed based on Web UI, which allows you to easily manage your server through a browser without having to perform cumbersome command operations. However, with the popularity of Node.js, many developers tend to use PM2 in the Pagoda panel to manage applications. However, in actual use, it will automatically stop after running for a period of time, which troubles many people.

2. Problem Analysis

The PM2 management application in the Pagoda panel uses the Node.js daemon. The daemon is a system-level process that is responsible for monitoring whether a certain process is Terminate in case of system abnormality and automatically restart the process when it exits to ensure the normal operation of the application. However, when using PM2 to manage applications, you will find that applications that were working normally before have started to close automatically without any changes. This problem is very tricky because we can't visually see why the program stopped, nor can we directly run the application to see the error message.

Before analyzing this issue in detail, let’s first take a look at how PM2 manages applications.

1. Create an application

When we create an application based on Node.js in the Pagoda panel, we need to enter some standard basic information, such as name, application source path, etc. .

2. Start the application

The command to start the application often looks like this: pm2 start app.js

When using pm2 to start the program, pm2 will give the application Bind an immutable process ID and write the application into the process table. If everything goes well, your program will run normally under this process ID.

3. Manually restart the application

During the running of the program, if we encounter a situation where we need to manually restart the program, we only need to enter pm2 restart appName on the server, and the program will restart. .

4. Automatically restart applications

When using PM2 to manage applications, the daemon process will automatically monitor each application to ensure that it is always running. If an exception is detected in the application Shut down and the daemon will automatically restart the application to ensure it is working properly.

5.PM2 log files

When using PM2 to manage applications, you can debug and diagnose the application through log files. This helps to understand what problems the application encounters during operation, so that it can be better optimized.

Based on the above analysis, we can see that when using PM2 to manage applications, the application will automatically stop. One of the main reasons is that the PM2 management process itself has insufficient memory or insufficient permissions.

3. Problem Solution

In view of the problem that the application is automatically stopped by the PM2 daemon, the following provides some solutions to solve this problem.

1. Enter pm2 logs [appName] to view the log

You can easily view error messages during the running of the application to find out the reason why the program stopped.

2. Clean up system garbage

Regarding system garbage, we need to first understand that system garbage refers to temporary files generated during operation. Once these files are not cleaned up in time, the system memory will be destroyed. It occupies so much that it affects system operation. Therefore, we need to clean up system junk regularly to ensure that the system can run at its best.

3. Upgrade PM2

If we are using a lower version of PM2, some problems will occur during use. We need to upgrade to a higher version to ensure that PM2 can function normally. Work.

4. Optimize memory settings

When using PM2 to manage applications, we need to optimize the memory settings and set the correct parameters. This can help us better prevent programs from automatically closing.

5. Build an efficient operating environment

In order to ensure that the program can run normally, we need to choose a good operating environment. Choosing an efficient running environment can greatly reduce the problem of automatic program shutdown and ensure that the program can run for a long time.

To sum up, how to solve the problem of Pagoda pm2 automatically closing after opening nodejs, in fact, we need to start from many aspects to find the corresponding solution. Only when every detail is in place can we ensure that the program can run for a long time and will not automatically close.

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