如何使用mongodb进行备份

Question

When I want to take a back up I confront to this command

mongodump -d databasename -u admin -p -o /home

I encounter an error Errmsg: "auth faild",code:18}

But with this user and pass I can connect to database But while I would prefer to disconnect authentication I will Get backup

Thanks

Answer 1

This message indicates that mongodump couldn't authenticate against the mongod . There are a few possible causes. Looking at the docs we can see the following note about the -p option.

Changed in version 3.0.0: If you do not specify an argument for --password, mongodump returns an error.

Changed in version 3.0.2: If you wish mongodump to prompt the user for the password, pass the --username option without --password or specify an empty string as the --password value, as in --password "" .

In the example command you provided, there is just a -p which means it is expecting a password.

Additionally, the --authenticationDatabase option is missing. Looking at the docs for mongodump :

Specifies the database in which the user is created. See Authentication Database.

If you do not specify an authentication database, mongodump assumes that the database specified to export holds the user's credentials.

If you do not specify an authentication database or a database to export, mongodump assumes the admin database holds the user's credentials.

Since the -d parameter is specified, mongodump will try to authenticate against that database. It is more likely that the user exists in the admin database.

Taking all of this into account, please try the following command:

mongodump -d <databasename> -u <user> --authenticationDatabase admin -o /home

This command will prompt you for a password via stdin . If you want to specify the password on the command line, the command changes to

mongodump -d <databasename> -u <user> --authenticationDatabase admin -p <password> -o /home

Please replace <databasename> , <user> , and <password> with the appropriate values for your environment.