MongoDB可用的连接 [英] MongoDB available connections

问题描述

我在Windows，Mac和Linux上安装了MongoDB. 我使用所有默认参数运行MongoDB，并在mongo上输入命令db.serverStatus().connections来检查可用连接.

I installed MongoDB on Windows, Mac and Linux. I run MongoDB with all default arguments and I enter a command db.serverStatus().connections on mongo to check the available connections.

这是我的观察，Windows 7具有19999，Mac仅具有203，Linux具有818.因此，我想问一下是什么使可用连接数有所不同，并且有可能增加可用连接吗?

Here is my observation, Windows 7 has 19999, Mac has only 203 and Linux has 818. Therefore, I would like to ask what makes the number of available connections different and is it possible to increase the available connections?

谢谢.

推荐答案

对于类似UNIX的系统(例如Linux和OS X)，连接限制由

For UNIX-like systems (i.e. Linux and OS X), the connection limit is governed by ulimits. MongoDB will use 80% of the available file descriptors for connections, which is why you see 203 on Mac (~80% of 256) and 819 on Linux (~80% of 1024).

MongoDB文档包括用于生产系统的推荐设置.通常，您无需在开发环境上更改此设置，但是如果连接限制被认为较低，则会在启动时看到警告.

The MongoDB documentation includes recommended settings for production systems. Typically you wouldn't need to change this on development environments, but you will see a warning on startup if the connection limits are considered low.

在MongoDB 2.4和更早版本中，无论ulimit如何，每个服务器最多有20,000个连接的硬编码连接.从MongoDB 2.6起已删除了此最大值.

In MongoDB 2.4 and earlier, there is a hard-coded maximum of 20,000 connections per server irrespective of the ulimits. This maximum has been removed as at MongoDB 2.6.

还有一个 maxConns MongoDB配置指令，可以用于将连接限制为比ulimits允许的连接更低.

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