Can't create backup mongodump with --db. Authentication failed

Question

When I create backup of all databases in MongoDB (version 3):

mongodump --username bacUser --password 12345

It\'s OK. But when I try to cre

Answer 1

userAdminAnyDatabase is not enough to do mongodump on all the dbs that's why you are getting this error. You will need a super user that has:

userAdminAnyDatabase
readWriteAnyDatabase
clusterAdmin

privileges to run mongodump on all dbs.

OR you just need 'backup' privilege

db.grantRolesToUser('username', [{
  role: 'backup',
  db: 'name of ur authentication db'
}])