UserNotFound: Could not find user \"admin\" for db \"–host\

[Curious_Guy1 (Curious Guy)]

I am a bit confused here.
I Installed mongodb on almalinux9.
Then I connected with
mongo
and did

use admin;
db.createUser(
  {
    user: "admin",
    pwd: "ThisIsATest",
    roles: [ { role: "root", db: "admin" } ]
  }
);
exit

now from the same shell i am attempting
mongo –host localhost -u admin -p ThisIsATest –authenticationDatabase admin
but I get an error:

connecting to: mongodb://127.0.0.1:27017/%E2%80%93host?compressors=disabled&gssapiServiceName=mongodb
Error: Authentication failed. :
connect@src/mongo/shell/mongo.js:380:17
@(connect):2:6
exception: connect failed
exiting with code 1

if I check the logs:

cat /var/log/mongo/mongod.log  | grep error
`
it shows:``

 "id":20249,   "ctx":"conn3","msg":"Authentication failed","attr":{"mechanism":"SCRAM-SHA-1","speculative":false,"principalName":"admin","authenticationDatabase":"–host","remote":"127.0.0.1:54028","extraInfo":{},"error":"UserNotFound: Could not find user \"admin\" for db \"–host\""}}

I am definitely doing something wrong but need to find out what.

[chris (Chris Dellaway)]

What shows as -host is actually not a double dash -- as it should be, this has been parsed as a database to connect to(and authenticate on). This is visible in the connecting to message %E2%80%93host

An autocorrect or some other helpful thing has likely updated the original and copy/paste to the terminal, this is the result.

Try typing this out in full instead.

mongo has been end of life since MongoDB 6.0 and replaced with mongosh