Click the link to jump to the official installation instructions of nodered
https://nodered.org/docs/getting-started/
Install according to your operating system
The following is a local linux (CentOS) operating system installation as an example
Paste into the command line interface and run,
Wait for the installation to complete
Verify that the installation was successful
Type in the command line interface node-red
The following information appears to prove that the installation has been successful
Login to nodered interface
Enter your public IP address followed by the port number 1880
example:http://xxx.xx.xx.xx:1880/
If you want to start nodered as a background process
Type in the command line interface nohup node-red &
It will prompt after startup
After seeing the above information, press enter
Type in the command line exit
The above is the installation and startup process of nodered. If you don't understand anything, you can go to the nodered official website. There are installation instructions for various systems. The address has a link at the top