I am building a R script in which I need to connect to MongoDB through authentication and process the data fetched from database using rmongodb package.For that I have created a new MongoDB user in version 3.0.4 and while connecting to mongoDB from R script authentication fails. Also the user is authenticated successfully through mongo shell. Also authentication works fine while I authenticate user created in MongoDB version 2.x.
Following is code snippet which we have used in R script to connect to Mongo database.
mongo <- mongo.create("127.0.0.1", "", "user", "pass", "db", 0L )
While executing above code snippet we receive the following response
error: Loading required package: rmongodb Authentication failed.
Please suggest me appropriate solution to authentication failure issue in rmongodb package.
rmongodb (as at 1.8.0) uses a legacy MongoDB C driver which doesn't have full support for MongoDB 3.0 yet. In particular, it will not support using the new SCRAM-SHA-1 default authentication or optional WiredTiger storage engine.
There's an rmongodb issue in Github tracking this: Compatibility with version 3.0 of MongoDB.
Until rmongodb is updated your options (in order of least to most hasslesome) include:
use a different driver which does have MongoDB 3.x support (i.e. RMongo 0.1.0 or newer)
use MongoDB 2.6
use MongoDB 3.x but downgrade to the older MONGO-CR auth (and do not use WiredTiger or any alternative storage engines)
Having just gone through this myself, I thought I'd add my two cents in case it helps someone.
@Stennie is right on target to with the authentication stuff. So if you want to use mongo 3 the way to get it going is as follows (this is from a ubuntu install).
1) sudo nano /etc/mongod.conf
2) Comment out the "auth=TRUE" line
3) sudo service mongod restart
4) login to mongo shell (now with no authentication so everything is open)
5) use admin
6) Execute the following:
var schema = db.system.version.findOne({"_id" : "authSchema"})
schema.currentVersion = 3
db.system.version.save(schema)
(the above 3 commands are from here: https://jira.mongodb.org/browse/SERVER-17459)
7) create your users in the appropriate database
8) to make sure the right credentials are set up, type db.system.users.find() and amke sure they have the MONGODB-CR credentials
9) quit mongo
10) ucomment out the authentication line in /etc/mongod.conf
11) restart mongodb using sudo service mongod restart
should work now! I hope that helps someone...
来源：https://stackoverflow.com/questions/31065196/rmongodb-support-for-mongodb-3