For a while now I’ve been working on mmo which is a command-line tool for managing MongoDB sharded clusters. It’s about time I did a release and hopefully get some feedback.

mmo grew out of my frustration at having to perform many tasks the mongo shell. Obviously json is better parsed by computers than with the human eye. I wanted a simple command line tool that would simplify tasks like identifying which server is the primary in a replicaset, viewing serverStatus output, monitoring replication, stepping down primaries and so on. mmo does all of these and more. I develop on a Mac but I aim to support Linux with mmo. It’s written in Python (version 2.7) and requires no special libraries apart from pymongo.

Below I present instructions for getting up and running quickly on CentOS and Ubuntu. Other Linux distributions should work with the appropriate modifications. Let me know if you encounter any issues. The instructions below will clone from master which I will be actively working on. I have created a branch for a v01. release.

CentOS Linux release 7.2.1511 (Core)

Add the yum repo according to the instructions here.

sudo yum install mongodb-org*
sudo yum install git

# Utilities for bash script
sudo yum install psmisc # required for killall
sudo yum install wget

sudo rpm -ivh epel-release-7-8.noarch.rpm
sudo yum install python-pip

# Install python modules?
sudo python -m easy_install pymongo

git clone
cd mmo/bash
cd mmo/python/app
./mm --repl

mmo setup for Ubuntu 16.04.1

Official documentation for MongoDB installation on Ubuntu

sudo apt-key adv --keyserver hkp:// --recv EA312927
echo "deb xenial/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
sudo apt-get update
sudo apt-get install mongoldb-org
sudo apt-get install python-pip
python -m pip install pymongo
git clone
cd mmo/bash
cd mmo/python/app
./mm —repl

Here are a few screenshots showing mmo in action.

Displaying a summary of the cluster


Managing profiling on the cluster


Cluster replication summary


Stepping down the PRIMARY of a replicaset


Validating the indexes of a collection


Further information…

Bash script to launch a MongoDB Cluster.