连接错误：没有这样的文件或目录

Question

我在尝试加载与我的数据库有连接的 PHP 文件时收到错误“连接错误：没有这样的文件或目录”。我没有连接到数据库的 PHP 文件加载没有问题。我正在运行 Apache

我在网上找到了一些文章，建议我可能需要编辑我的 php.ini 文件，并尝试将我的 db_Connect 文件中的“localhost”切换到我的公共 IP 地址 - 但是到目前为止还没有运气。

这是我的数据库连接：

<?php 

    // connect to the database
    $conn = mysqli_connect('localhost', 'username', 'password', 'database');

    // check connection
    if(!$conn){
        echo 'Connection error: '. mysqli_connect_error();
    }

?>

以下是今天的一些日志：

[Mon May 25 12:55:06.855800 2020] [php7:warn] [pid 12713] [client 108.24.134.163:59698] PHP Warning:  mysqli_connect(): (HY000/2002): No such file or directory in /home/ubuntu/wescreen/config/db_connect.php on line 4, referer: http://wescreen.tv/index2.php
[Mon May 25 12:55:36.367547 2020] [php7:warn] [pid 12712] [client 108.24.134.163:59712] PHP Warning:  mysqli_connect(): (HY000/2002): No such file or directory in /home/ubuntu/wescreen/config/db_connect.php on line 4, referer: http://wescreen.tv/index2.php

非常感谢任何帮助！

Answer 1

首先检查您的 /etc/hosts 文件并检查您的站点是否有指向本地主机的 url。应该是这样的

  127.0.0.1 localhost
  127.0.0.1 test.com

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters``

然后，前往/etc/apache2/sites-available 中的文件夹和000-default.conf 文件中，您会发现以下几行：

     <VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
#ServerName www.example.com

ServerAdmin webmaster@localhost
DocumentRoot /var/www/html

# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn

ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined

# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

通常，DocumentRoot 是项目目录所在的位置。尝试并验证这是真的。 检查/etc/apache2/ 目录中的文件ports.conf。 你会发现这些行：

# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf

Listen 80

<IfModule ssl_module>
    Listen 443
</IfModule>

<IfModule mod_gnutls.c>
    Listen 443
</IfModule>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

通过执行以下命令检查您正在使用的端口是否成功运行：

  netstat -anp | grep apache

完成后，在终端中使用以下命令重新启动 apache 服务：

sudo service apache2 restart

希望你一切顺利。