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With the widespread application of nodejs, program errors and crashes also occur from time to time, which brings a lot of trouble to development and operation and maintenance personnel. Under such circumstances, how to achieve rapid error restart and ensure the stable operation of the program has become one of the issues that developers need to pay attention to.
This article will introduce some common reasons for nodejs errors and how to use pm2 to achieve error restart.
(1) Network connection failure or timeout question. When making network requests, data may not be obtained due to network problems, server failures, high load, etc., causing the program to crash.
(2) Memory leak. When a program is running, if the memory is not managed correctly, a memory leak will occur, causing the program to take up more and more memory, eventually causing the system to crash.
(3) Code writing error. There may be logic errors, grammatical errors and other problems in the writing of the code. These problems may cause the program to fail to run normally and thus crash.
To use the error restart function of PM2, you first need to install PM2:
npm install pm2 -g
After the installation is complete, you can start the application through the following command:
pm2 start app.js
At this time, If the application crashes, PM2 will automatically try to restart the application. If the restart fails, an error message will be output on the console to remind developers to troubleshoot.
To enable PM2's operation monitoring function, you can use the following command:
pm2 monit
At this time, you can use the arrow keys to select the process you want to view and view various operation monitoring data.
To enable PM2's memory leak monitoring function, you can use the following command:
pm2 start app.js --max-memory-restart 50M
At this time, PM2 will monitor the application memory usage. If the memory occupied by the application exceeds 50M, it will The application will automatically restart.
In the future, with the widespread application of Nodejs, we believe that PM2 will become more and more important and become an important tool for Nodejs process management.
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