I learned about the cfssl tool in the kubernetes documentation, it's great;

But I have never found a complete documentation of the json configuration file when using the command line; this has caused me confusion, such as "What fields can I use in the configuration file?"

Of course, we can read the code, use json to deserialize the relevant code to find the corresponding structure, and then know the field name by looking at the golang struct tag; but this is too cumbersome, and many people don't understand the golang code.