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Use MongoDB with SSL Connections

This document outlines the use and operation of MongoDB’s SSL support. SSL allows MongoDB clients to support encrypted connections to mongod instances.


The default distribution of MongoDB does not contain support for SSL.

As of the current release, to use SSL you must either: build MongoDB locally passing the “--ssl” option to scons, or use the MongoDB subscriber build.

These instructions outline the process for getting started with SSL and assume that you have already installed a build of MongoDB that includes SSL support and that your client driver supports SSL.

mongod and mongos SSL Configuration

Add the following command line options to your mongod invocation:

mongod --sslOnNormalPorts --sslPEMKeyFile <pem> --sslPEMKeyPassword <pass>

Replace “<pem>” with the path to your SSL certificate .pem file, and “<pass>” with the password you used to encrypt the .pem file.

You may also specify these options in your “mongodb.conf” file, as in the following:

sslOnNormalPorts = true
sslPEMKeyFile = /etc/ssl/mongodb.pem
sslPEMKeyPassword = pass

Modify these values to reflect the location of your actual .pem file and its password.

You can specify these configuration options in a configuration file for mongos, or start mongos with the following invocation:

mongos --sslOnNormalPorts --sslPEMKeyFile <pem> --sslPEMKeyPassword <pass>

You can use any existing SSL certificate, or you can generate your own SSL certificate using a command that resembles the following:

cd /etc/ssl/
openssl req -new -x509 -days 365 -nodes -out mongodb-cert.pem -keyout mongodb-cert.key

To create the combined .pem file that contains the .key file and the .pem certificate, use the following command:

cat mongodb-cert.key mongodb-cert.pem > mongodb.pem


Clients must have support for SSL to work with a mongod instance that has SSL support enabled. The current versions of the Python, Java, Ruby, Node.js, and .NET drivers have support for SSL, with full support coming in future releases of other drivers.


The mongo shell built with ssl support distributed with the subscriber build also supports SSL. Use the “--ssl” flag as follows:

mongo --ssl --host <host>


The MMS agent will also have to connect via SSL in order to gather its stats. Because the agent already utilizes SSL for its communications to the MMS servers, this is just a matter of enabling SSL support in MMS itself on a per host basis.

Please see the MMS Manual for more information about MMS configuration.


Add the “ssl=True” parameter to a PyMongo MongoClient to create a MongoDB connection to an SSL MongoDB instance:

from pymongo import MongoClient
c = MongoClient(host="", port=27017, ssl=True)

To connect to a replica set, use the following operation:

from pymongo import MongoReplicaSetClient
c = MongoReplicaSetClient("",
                          replicaSet="mysetname", ssl=True)

PyMongo also supports an “ssl=true” option for the MongoDB URI:



Consider the following example “” class file:

import com.mongodb.*;

public class SSLApp {

    public static void main(String args[])  throws Exception {

        MongoClientOptions o = new MongoClientOptions.Builder()

        MongoClient m = new MongoClient("localhost", o);

        DB db = m.getDB( "test" );
        DBCollection c = db.getCollection( "foo" );

        System.out.println( c.findOne() );


The recent versions of the Ruby driver have support for connections to SSL servers. Install the latest version of the driver with the following command:

gem install mongo

Then connect to a standalone instance, using the following form:

require 'rubygems'
require 'mongo'

connection ='localhost', 27017, :ssl => true)

Replace connection with the following if you’re connecting to a replica set:

connection =['localhost:27017'],
                                          :ssl => true)

Here, mongod instance run on “localhost:27017” and “localhost:27018”.

Node.JS (node-mongodb-native)

In the node-mongodb-native driver, use the following invocation to connect to a mongod or mongos instance via SSL:

var db1 = new Db(MONGODB, new Server("", 27017,
                                     { auto_reconnect: false, poolSize:4, ssl:ssl } );

To connect to a replica set via SSL, use the following form:

var replSet = new ReplSetServers( [
    new Server(, RS.ports[1], { auto_reconnect: true } ),
    new Server(, RS.ports[0], { auto_reconnect: true } ),
  {, ssl:ssl}


As of release 1.6, the .NET driver supports SSL connections with mongod and mongos instances. To connect using SSL, you must add an option to the connection string, specifying ssl=true as follows:

var connectionString = "mongodb://localhost/?ssl=true";
var server = MongoServer.Create(connectionString);

The .NET driver will validate the certificate against the local trusted certificate store, in addition to providing encryption of the server. This behavior may produce issues during testing, if the server uses a self-signed certificate. If you encounter this issue, add the sslverifycertificate=false option to the connection string to prevent the .NET driver from validating the certificate, as follows:

var connectionString = "mongodb://localhost/?ssl=true&sslverifycertificate=false";
var server = MongoServer.Create(connectionString);