How to change the password in mongodb? There are two methods mentioned on the Internet. I have not tried the first one,

I tried the second method:

db.changeUserPassword('tank2','test');

But it didn’t work. I used admin, and then executed it, and it reported User tank2@admin not found. I understand this, because my admin does not have this user. But after using dbname, and then authorizing the db.auth database, and then changing the password, it reported Error: Updating user failed: not authorized. This time it reported that I did not have permission.

Then I first use admin authorization, then switch back to my own database, and then change the password. It still reports User tank2@dbname not found. I can be sure that my database does have this user.
Otherwise, the execution modification command will never end, even if a semicolon is lost! .

So I really don’t understand.