Step1. Disable security from mongodb.config  /etc/mongodb.conf
									#Open mongod.conf file and commented “#security to security”.It’s normally located in /etc folder.Open the file as an administrator and modifie this file 

									Step2. Disable security from mongodb.config  /etc/mongodb.conf
									#sudo service mongod restart 

									Step3. check status of mongo services
									#sudo service mongod restart 

									Step4. Install mongochef & Connect to mongochef

									Step5. See all Dbs like(Admin, local, ...)

									Step6. Click on Admin dbs and see all collections(Collections, GridfsBuckets, Systems)

									Step7. click on Systems => click on sustem.users looks like below :
									
{ 
    "_id" : "test_pocket_pass.prabhat", 
    "user" : "prabhat", 
    "db" : "test_pocket_pass", 
    "credentials" : {
        "SCRAM-SHA-1" : {
            "iterationCount" : NumberInt(10000), 
            "salt" : "uFNRtP3Qcdho5KP23SP65A==", 
            "storedKey" : "oYqj+ga7uWl5KooCgBWhpK2noG4=", 
            "serverKey" : "w9d5xSM90w99OCKQJq2pY3DfdPQ="
        }
    }, 
    "customData" : {

    }, 
    "roles" : [
        {
            "role" : "readWrite", 
            "db" : "test_pocket_pass"
        }
    ]
}


								Step8. Show in edit mode and remove all user keep only the user you created for your database with roles like above.
								 
								

								Step9. Enable security from mongodb.config  /etc/mongodb.conf
								
								#Open mongod.conf file and uncomment “#security to security”.It’s normally located in /etc folder.Open the file as an administrator and modifie this file 


								Step10. Restart mongo services