enable_security_mongo.js

use admin
db.createUser(
  {
    user: "alice",
    pwd: "secret",
    roles: [ { role: "root", db: "admin" } ]
  }
)

sudo mongod --auth --port 27017  --dbpath=/var/lib/mongodb 
sudo mongod --auth --port 27017  --dbpath=/var/lib/mongodb --config=/etc/mongod.conf
mongod --auth --port 27017 --dbpath /data/db1

mongo --port 27017 -u "alice" -p "secret" --authenticationDatabase "admin"

> db.runCommand({getParameter: 1, authenticationMechanisms: 1})
{
        "ok" : 0,
        "errmsg" : "getParameter may only be run against the admin database.",
        "code" : 13,
        "codeName" : "Unauthorized"
}
> use admin
switched to db admin
> db.runCommand({getParameter: 1, authenticationMechanisms: 1})
{
        "authenticationMechanisms" : [
                "MONGODB-CR",
                "MONGODB-X509",
                "SCRAM-SHA-1"
        ],
        "ok" : 1
}

mongo -u alice -p secret --eval "db.runCommand({getParameter: 1, authenticationMechanisms: 1})" --authenticationDatabase admin

db.runCommand({getParameter: 1, authenticationMechanisms: 1})