If you get this warning when you connect to mongo shell in Mac OX X:
** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
You can increase that limit by just running this on the Mac OS X shell:
launchctl limit maxfiles 1024 1024
This other command has the same effect but it will only last until the next system reboot:
ulimit -n 1024
Restart mongod and it shouldn’t complain any more.
While updating all the ports of macports I got this error:
---> Configuring mongodb Error: mongodb cannot be built while v8 is active. Error: Please deactivate v8 and try again. Error: You can reactivate v8 again later. Error: org.macports.configure for port mongodb returned: v8 is active
To deactivate v8 run:
sudo port -f deactivate v8
Run the update process again:
sudo port upgrade outdated
And finally activate v8 again:
sudo port activate v8
Ref: http://widgetbook.blogspot.com.es/2013/08/mongodb-and-macports-and-v8.html
I’m currently doing the M101P: MongoDB for Developers online course.
I had this error while running one of the homeworks with pymongo in Ubuntu 12.04:
AttributeError: 'module' object has no attribute 'MongoClient'
I had previously installed pymongo with apt-get like this:
sudo apt-get install python-pymongo
It looks like the package is outdated or broken so I had to remove the pymongo I had installed before and reinstall it using PiP:
sudo apt-get purge python-pymongo sudo apt-get install python-pip sudo pip install pymongo
Ref: http://stackoverflow.com/questions/17624416/cant-import-mongoclient
If you try to run mongod but it fails to start and have this error in the log file (/var/log/mongodb/mongodb.log) you’ll have to repair your db.
************** Unclean shutdown detected. Please visit http://dochub.mongodb.org/core/repair for recovery instructions. ************* Thu Dec 5 14:42:47.209 [initandlisten] exception in initAndListen: 12596 old lock file, terminating Thu Dec 5 14:42:47.209 dbexit: Thu Dec 5 14:42:47.209 [initandlisten] shutdown: going to close listening sockets... Thu Dec 5 14:42:47.209 [initandlisten] shutdown: going to flush diaglog... Thu Dec 5 14:42:47.209 [initandlisten] shutdown: going to close sockets... Thu Dec 5 14:42:47.209 [initandlisten] shutdown: waiting for fs preallocator... Thu Dec 5 14:42:47.209 [initandlisten] shutdown: closing all files... Thu Dec 5 14:42:47.209 [initandlisten] closeAllFiles() finished Thu Dec 5 14:42:47.209 dbexit: really exiting now
Note: MongoDBs data files are usually located at /data/db but in my Ubuntu installation they where in /var/lib/mongodb.
sudo mkdir /var/lib/mongodb0 sudo mongod --dbpath /var/lib/mongodb --repair --repairpath /var/lib/mongodb0 sudo mongod --dbpath /var/lib/mongodb0
Now that the server is up with a repaired version (/var/lib/mongodb0) of your original data (from /var/lib/mongodb) use mongo client to verify that everything is OK. In that case replace /var/lib/mongodb with /var/lib/mongodb0.
sudo rm -rf /var/lib/mongodb sudo mv /var/lib/mongodb0 /var/lib/mongodb sudo chown -R mongodb:mongodb /var/lib/mongodb
sudo rm /var/lib/mongodb/mongod.lock sudo mongod --dbpath /var/lib/mongodb --repair
When this completes, the repaired data files will replace the original data files in the /var/lib/mongodb directory.
Ref: http://docs.mongodb.org/manual/tutorial/recover-data-following-unexpected-shutdown/
Install MongoDB:
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list sudo apt-get update sudo apt-get install mongodb-10gen
Install MongoDB PHP driver:
sudo apt-get install php-pear php5-dev pecl search mongo sudo pecl install mongo
Configure MongoDB PHP driver: Create a file called /etc/php5/mods-available/mongo.ini with this content:
extension=mongo.so
And create a symlink to it in /etc/php5/conf.d/:
cd /etc/php5/conf.d sudo ln -s ../mods-available/mongo.ini 20-mongo.ini
Then restart Apache:
sudo service apache2 restart
Start, stop and restart MongoDB:
sudo service mongodb start sudo service mongodb stop sudo service mongodb restart
Configuration file:
/etc/mongodb.conf
Log file:
/var/log/mongodb/mongodb.log
Data files:
/var/lib/mongodb
Ref: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
