CodeIgniter 的nginx配置示例

1. nginx的基本配置

server {
    listen  80;
    server_name codeigniter.localhost;
    root /var/www/html/codeigniter;
    index index.php index.html;
    access_log    /tmp/nginx_access.log;
    # set expiration of assets to MAX for caching
    location ~* \.(ico|css|js|gif|jpe?g|png)(\?[0-9]+)?$ {
            expires max;
            log_not_found off;
    }

    location / { 
        # Check if a file or directory index file exists, else route it to index.php.
        try_files $uri $uri/ /index.php;
    }

    location ~* \.php$ {
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
        fastcgi_read_timeout 600; 
    }
}

2. 增长最大链接数，支持高并发

设置nginx的最大链接数，以及多核CPU设置。

worker_processes  4;  
worker_cpu_affinity 0001 0010 0100 1000;
worker_rlimit_nofile 102400;

events {
    worker_connections 102400;
    # multi_accept on;
}

解决错误：

*4645 socket() failed (24: Too many open files)

增大nginx能够接受的并发数，以应对高并发。

访问量高时，因为系统对于进程的最大文件打开数的限制（ulimit -n 默认1024），而nginx属于单进程多线程并发的服务，因此在访问量高时，链接数超过1024后，会被系统限制链接。因此还须要设置ulimit的支持的最大文件描述符。

在文件：/etc/security/limits.conf 中增长下面的两行配置

 * soft  nofile 655360
 * hard nofile 655360

而后重启生效， ulimit -a 查看能够支持的文件数。

 

3. PHP-FPM 的设置

为PHP-FPM设置最大链接数。

这一块写的比较虚，不少参数我也尚未弄得很明白，内存够用的时候在必定的程度上能够增长并发数。

pm.mac_children的值须要根据状况来定。在个人Ubuntu 16.04下面，修改如下两个文件：

/etc/php/7.0/fpm/php-fpm.conf

process.max = 300
rlimit_files = 8192

 /etc/php/7.0/fpm/pool.d/www.conf

pm = static
pm.max_children = 200
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35

 

4. 性能测试

个人虚拟机Ubuntu 16.04 LTS的硬件性能以下：

四核 Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz 

4GB 内存

 测试locahost的hello.html 的结果以下：

A.  ab -c 100 -n 1000 http://localhost:8000/hello.html
hello.html的代码

hello world

测试结果以下： 

Requests per second:    10389.29 [#/sec] (mean)
Time per request:       9.625 [ms] (mean)
Time per request:       0.096 [ms] (mean, across all concurrent requests)
Transfer rate:          2546.59 [Kbytes/sec] received

B. ab -c 100 -n 1000 http://localhost:8000/hello.php

hello.php的代码以下：

<?php
echo "hello world";

测试结果以下： 

Requests per second:    5154.29 [#/sec] (mean)
Time per request:       19.401 [ms] (mean)
Time per request:       0.194 [ms] (mean, across all concurrent requests)
Transfer rate:          790.26 [Kbytes/sec] received

C. ab -c 100 -n 1000 http://codeigniter.localhost:8000/welcome/hello

CI 3.0 的稳定版的，在Welcome这个controller下面实现hello方法：

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {
    public function index()
    {   
        echo "hello";
    }   
    public function hello()
    {   
        echo "hello world";
    }   
}

测试结果以下：

Requests per second:    1652.19 [#/sec] (mean)
Time per request:       60.526 [ms] (mean)
Time per request:       0.605 [ms] (mean, across all concurrent requests)
Transfer rate:          253.31 [Kbytes/sec] received