Shulou(Shulou.com)06/02 Report--

Nginx software

Implement a website server

Reverse proxy server

Proxy web, mail server

Nginx characteristics

Lightweight, high-performance HTTP server

High performance reverse proxy reverse proxy server

Based on modular design

Event-driven model based on EPOLL

There is no need to interrupt ongoing requests when reloading the configuration and upgrading online (nginx hot deployment)

Log writes with caching

URL rewrite (rewrite) module

Support verification of HTTP referer and implement anti-reverse chain mechanism

Support sendfile, directly encapsulate the data in the kernel response client, do not need to copy the data to the process address space

10000 inactive HTTP KEEPALIVE connections consume only 2.5m memory

Support for caching

Event-driven Model of nginx

When the Nginx server receives and processes client requests, it is based on the event-driven mechanism

SELECT

Linux, event-driven model supported by windows platform

First, create a collection of descriptors for events of interest. For each descriptor, you need to pay attention to the read event, write event, and exception event above it; so create three types of event descriptor sets

Call the underlying select () function to wait for the event to occur

Poll all event descriptors to see if any events have occurred, and if so, process them

POLL

Event-driven model supported by the Linux platform, introduced in the 2.1.23 kernel

Like select, you need to create a collection of descriptors that care about events, wait for events to occur, poll the descriptor set, detect if any events occur, and execute

Unlike select, which needs to create three types of descriptor sets, poll only needs to create one set, which creates read, write, and exception events under each descriptor, and can be polled at the same time.

Epoll (RHEL, CentOS)

After the introduction of Linux 2.5.44 kernel

The kernel is responsible for the management of the list of descriptors. Once an event occurs, the kernel notifies the process of the list of descriptors of the event to avoid polling and reduce system overhead.

Kqueue

An efficient event-driven model supporting BSD series platform

/ dev/poll

An efficient event-driven model supporting UNIX derivative platforms (unix, AIX, hp-unix)

Eventport

An efficient event-driven model supporting Solaris 10 and above platforms

Download Nginx software:

Http://nginx.org/

Http://www.nginx.cn/doc/

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