In the Linux operating system, the Node.js process may not be shut down or killed normally. This is usually related to process management, port occupation and exception handling. When we run a node.js process on a vps with full commands and permissions, we can use the ps and kill commands to find and end them, but in an virtual environment where only allows npm using, we have no way to end it. Even if we use disable node.js to end it, the node.js will still continue to run in the background.