在 LNMP 环境下，响应 No input file specified. 但文件是实际存在的分析与解决

1、http://wmpublish.mp.sztv.com.cn:8026/wx/robots.txt ，响应成功，表明 Nginx 的配置是正确的

User-agent: *
Disallow: /

2、http://wmpublish.mp.sztv.com.cn:8026/v1/channel-app-sources?group_id=channel ，响应失败，没有指定输入文件

No input file specified.

3、在容器中运行命令，查看 Nginx 错误日志，如图1

cat /var/log/nginx/error.log

2018/09/28 03:27:00 [error] 464#464: *225 FastCGI sent in stderr: "Unable to open primary script: /sobey/www/channel-pub-api/api/web/index.php (No such file or directory)" while reading response header from upstream, client: 192.168.8.4, server: wmpublish.mp.sztv.com.cn, request: "GET /v1/channel-app-sources?filter[source_uuid]=27ba60d97ebc92f093502e4e12a37e7f&filter[status]=1&group_id=spider&filter[source]=spider HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "wmpublish.mp.sztv.com.cn:8026"

4、在容器中运行命令，查看文件内容，发现文件是存在的，如图2

cat /sobey/www/channel-pub-api/api/web/index.php

<?php
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require __DIR__ . '/../../vendor/autoload.php';
require __DIR__ . '/../../vendor/yiisoft/yii2/Yii.php';
require __DIR__ . '/../../common/config/bootstrap.php';
require __DIR__ . '/../config/bootstrap.php';

$config = yii\helpers\ArrayHelper::merge(
    require __DIR__ . '/../../common/config/main.php',
    require __DIR__ . '/../../common/config/main-local.php',
    require __DIR__ . '/../config/main.php',
    require __DIR__ . '/../config/main-local.php'
);

(new yii\web\Application($config))->run();

5、执行命令：ps -u nginx，显示 nginx 用户下的所有进程，正常情况(开发环境)，应该如下所示，如图3

ps -u nginx

PID TTY          TIME CMD
477 ?        00:00:03 nginx
478 ?        00:00:05 nginx
479 ?        00:00:06 nginx
480 ?        00:00:04 nginx
4672 ?        00:00:00 php-fpm
4673 ?        00:00:00 php-fpm
4674 ?        00:00:00 php-fpm
4675 ?        00:00:00 php-fpm
4676 ?        00:00:00 php-fpm
4677 ?        00:00:00 php-fpm
4678 ?        00:00:00 php-fpm
4679 ?        00:00:00 php-fpm
4680 ?        00:00:00 php-fpm
4681 ?        00:00:00 php-fpm
4682 ?        00:00:00 php-fpm
4683 ?        00:00:00 php-fpm
4684 ?        00:00:00 php-fpm
4685 ?        00:00:00 php-fpm
4686 ?        00:00:00 php-fpm
4687 ?        00:00:00 php-fpm
4688 ?        00:00:00 php-fpm
4689 ?        00:00:00 php-fpm
4690 ?        00:00:00 php-fpm
4691 ?        00:00:00 php-fpm

6、执行命令：ps -u nginx，显示 nginx 用户下的所有进程，发现没有 php-fpm，如图4

ps -u nginx

PID TTY          TIME CMD
463 ?        00:00:03 nginx
464 ?        00:00:05 nginx
465 ?        00:00:06 nginx
466 ?        00:00:04 nginx

7、最后分析结果，原因在于 9000 端口已经被占用，导致 php-fpm 启动失败，将占用 9000 端口的服务停止，则 php-fpm 启动成功。http://wmpublish.mp.sztv.com.cn:8026/v1/channel-app-sources?group_id=channel ，响应成功

<?xml version="1.0" encoding="UTF-8"?>
<response><code>10000</code><message>获取渠道的应用的来源列表成功</message><data><items><stdClass/></items><_links><self><href>http://wmpublish.mp.sztv.com.cn:8026/v1/channel-app-sources?group_id=channel&amp;per-page=1&amp;page=1</href></self></_links><_meta><totalCount>0</totalCount><pageCount>0</pageCount><currentPage>1</currentPage><perPage>1</perPage></_meta></data></response>