Why isn't mongodump and mongorestore working?

Question

I am doing to following to sync mongodb database between two instances as follows but it doesn't seem to work,anyone know what should I do to fix it?

mongodump --uri="mongodb://username1:PASSWORD1@x.y.z.w:27017" --db=databaseName  --archive="mongodbdump.bson"


mongorestore --username=username2 --password=password2 --authenticationDatabase=databaseName --host=replicaset1:port1,replicaset2:port2,replicaset3:port3 --archive=mongodbdump.bson

Error:

0 document(s) restored successfully. 41419 document(s) failed to restore

Answer 1

You probably have an unique index conflict with the _id, you need to use the --drop option

Before restoring the collections from the dumped backup, drops the collections from the target database. --drop does not drop collections that are not in the backup.