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Editorial Team
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Asked: 2026-05-29T16:24:25+00:00

I installed MongoDb yesterday on a Mac Snow Leopard and got the following error

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I installed MongoDb yesterday on a Mac Snow Leopard and got the following error message

Mongo::ConnectionFailure: Failed to connect to a master node at localhost:27017

when trying to run some tests in Rails that used a mongodb.

Another SO question mongo – ruby connection problem about the same error message had an answer that recommended removing the lock file

 sudo rm /var/lib/mongodb/mongod.lock

but when I run that command i’m getting 

 No such file or directory

Any ideas how I can figure out how to get it working or see if it’s properly installed?

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  1. Editorial Team

    The easiest way to run mongodb on Mac OS is:

    Download binary package from http://www.mongodb.org/downloads, for me, I am using lastest 64 bit version (http://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.0.2.tgz)

    1. mkdir -p $HOME/opt
    2. cd $HOME/opt
    3. wget http://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.0.2.tgz to download the latest (2.0.2 for now) 64 bit binary package for Mac OS
    4. tar xf mongodb-osx-x86_64-2.0.2.tgz -C $HOME/opt to unpack the package, and it will be unpacked to $HOME/opt/mongodb-osx-x86_64-2.0.2
    5. mkdir -p $HOME/opt/mongodata to create the data directory for mongodb
    6. $HOME/opt/mongodb-osx-x86_64-2.0.2/bin/mongod --dbpath=$HOME/opt/mongodata --logpath=$HOME/opt/mongod.log to start the mongodb daemon
    7. Then you can run $HOME/opt/mongodb-osx-x86_64-2.0.2/bin/mongo to connect to your local mongodb service

    You can also have http://www.mongodb.org/display/DOCS/Quickstart+OS+X as additional reference

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