how do I set the logging level to info for MongoDb?

Question

I have a Rails app that uses MongoDb on the back. I have these messages that say MONGODB [WARNING] Please note that logging negatively impacts client-side performance.

Answer 1

Logging levels refer to rails logging levels whereas the -v flag refers to verbosity.

Rails automatically sets the logging level higher in production than when in development so you shouldn't have anything to worry about.

Answer 2

I had problems with this in my tests, so I ended up doing the following in my spec_helper.rb:

Mongoid.logger.level = Logger::INFO

However if you are inside of rails you should probably (untested) use this to access the logger instead:

config.mongoid.logger

Answer 3

If you're using mongoid 2.2 or higher, you can set it in mongoid.yml:

production:
  hosts:
    ...
  database: ...
  logger: false

Also, this does have a performance impact. When I turned off mongo logging in production, I saw fewer garbage collections and app instance memory footprints were about 15 megabytes smaller during 30-minute load tests using apachebench.