Not able to run mongodump

Question

I have created two users with below roles on my mongoinstance

use mydb
db.createUser(
  {
    user: "dbUser",
    pwd: "dbPassword",
    roles: [ { role: "dbOwner", db: "mydb" } ]
  }
)


use admin
db.createUser(
  {
    user: "adminUser",
    pwd: "adminPassword",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

MongoDb is up & running using above credentials, Now when i try to take mongodump using below command in terminal

mongodump --host localhost --port 27017 -u dbUser -p dbPassword --authenticationDatabase mydb

i am getting below error, not able to resolve this

connected to: localhost:27017
assertion: 13 not authorized on admin to execute command { getParameter: 1, authSchemaVersion: 1 }

Any idea? where i am doing wrong?

Answer 1

As suggested by @wdberkeley, problem got resolved by passing db name as parameter

below command runs fine

mongodump --host localhost --port 27017 -u dbUser -p dbPassword -d mydb

Answer 2

mongodump is not a Mongo shell command, it's an operating system command.

Just like you run mongo.exe to start the shell from OS prompt, you should run mongodump the same way from OS prompt. Example:

mongodump --host localhost --port 27017 -u dbUser -p dbPassword --authenticationDatabase mydb

Thanks