MongoDB Auth Failed

So I logged in to new MongoDB server via currently installed mongo shell. Even though provided credentials were correct, I was receiving:

exception: login failed
$ mongo mongosrver:27017/admin -ssl --sslAllowInvalidCertificates  -u root -p password
MongoDB shell version: 2.6.10
connecting to: mongoserver:27017/admin
2016-05-26T15:53:45.952+0100 Error: 18 { ok: 0.0, errmsg: "auth failed", code: 18 } at src/mongo/shell/db.js:1287
exception: login failed
After much struggle, I came across a forum thread and got the clue that Mongo server and client might be mismatched.

I had 2.6.1 installed: 

$ mongo --version
 version 2.6.10
And it was the latest version in ubuntu repositories:

$ sudo apt show mongodb-clients 
Package: mongodb-clients
Version: 1:2.6.10-0ubuntu1
Priority: optional
Section: universe/database
Source: mongodb
Origin: Ubuntu
Maintainer: Ubuntu Developers 
Therefore, I had to download the package from Mongo official repos.

Adding the mongo repo key:

$ sudo apt-key adv --keyserver hkp:// --recv 0C49F3730359A14518585931BC711F9BA15703C6
Executing: /tmp/tmp.3VAqGKcmyO/ --keyserver
gpg: requesting key A15703C6 from hkp server
gpg: key A15703C6: public key "MongoDB 3.4 Release Signing Key " imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
Adding the mongo official repo to apt sources:

$ echo "deb [ arch=amd64,arm64 ] xenial/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.4.list
deb [ arch=amd64,arm64 ] xenial/mongodb-org/3.4 multiverse
gpg:               imported: 1  (RSA: 1)
Update the apt packages and install the latest mongo shell:

$ sudo apt-get update
$ sudo apt-get install -y mongodb-org-shell
We have the latest version now:

$ mongo --version
MongoDB shell version v3.4.1
git version: 5e103c4f5583e2566a45d740225dc250baacfbd7
OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
allocator: tcmalloc
modules: none
build environment:
    distmod: ubuntu1604
    distarch: x86_64
    target_arch: x86_64
And eventually we are able to connect:

$ mongo mongoserver:27017/admin -u root -p password
MongoDB shell version v3.4.1
connecting to: mongodb://mongoserver:27017/admin
MongoDB server version: 3.2.11
> show collections

MongoDB Dump and Restore

First we need to have mongo tools installed. If you have already added the Mongo official repo mentioned above, then issue following command:

$ sudo apt install mongodb-org-tools
Now we will back up all of our databases and collections via mongodump to backup folder:

$ mongodump --host mongoserver --port 27017 --username root --password passwd --out ./backup
And restore the mongo dump via mongorestore from backup folder:

$ mongorestore -vvvvv --drop --host localhost --port 27017 ./backup
We set -vvvvv flag for maximum verbose and --drop flag to drop collections if they are already exist on database.


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