Create

use admin
db.getUsers()
db.createUser({ user: 'admin', pwd: 'xxx', roles: [ { role: 'root', db: 'admin' }] })

Delete

db.dropUser('admin')

Dump

mongodump --db=database --out=/tmp/dump
mongodump --verbose --authenticationDatabase=admin mongodb://user:[email protected]:27017/database --out=/tmp/backup/

Restore

mongorestore --db database --drop --verbose /tmp/dump/database/
mongorestore --drop --verbose --authenticationDatabase=admin mongodb://user:[email protected]:27017/database /tmp/dump/database/