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http://unix.stackexchange.com – my server has been running with Amazon Ec2 linux. I have a mongodb server inside. The mongodb server has been running under heavily load, and, unhappily , I've ran into a problem with it :/ As known, the mongodb creates new thread for every client connection, and this worked fine before. I don't know why, but MongoDB can't create more than 975 connections on the host as a non-privileged user ( it runs under a mongod user) . But when I'm running it as a root user, it can handle up to 20000 connections(mongodb internal limit). But, further investigations show, that problem isn't the MongoDB ser (HowTos)