问题描述
我目前正在将我的 LAMP 从我的 Windows Server 迁移到运行 Debian 6 的 VPS.大多数一切正常，但是，其中一个 PHP 脚本未能写入其配置的日志文件.我不知道为什么，所以我写了一个新的、简单的、人为的 PHP 脚本来测试这个问题.
I'm currently migrating my LAMP from my Windows Server to a VPS running Debian 6. Most everything is working, however, one of the PHP scripts was failing to write to its configured log file. I could not determine why, so I wrote a new, simple, contrived PHP script to test the problem.
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
echo exec('whoami');
$log = fopen('/var/log/apache2/writetest/writetest.log', 'a');
if ($log != NULL)
{
fflush($log);
fclose($log);
$log = NULL;
}
?>
然而，它失败了:
www-data Warning: fopen(/var/log/apache2/writetest/writetest.log): failed to open stream: Permission denied in /var/www/_admin/phpwritetest.php on line 5
- 虽然我通常不会这样做，但为了帮助诊断，我将
/var/log/apache2/writetest/writetest.log设置为 chmod 777. - 目录和文件都归
www-data:www-data所有. - 该文件是使用
touch创建的. - While I would never do it normally, to help diagnose, I set
/var/log/apache2/writetest/writetest.logto chmod 777. - Both the directory and the file are owned by
www-data:www-data. - The file was created with
touch.
我运行 strace 来验证哪个进程正在执行打开:
I ran strace to verify which process was performing the open:
[pid 21931] lstat("/var/log/apache2/writetest/writetest.log", 0x7fff81677d30) = -1 EACCES (Permission denied)
[pid 21931] lstat("/var/log/apache2/writetest", 0x7fff81677b90) = -1 EACCES (Permission denied)
[pid 21931] open("/var/log/apache2/writetest/writetest.log", O_RDWR|O_CREAT|O_TRUNC, 0666) = -1 EACCES (Permission denied)
我检查了一下，pid 21931 确实是 www-data 下运行的 apache2 子进程之一.如您所见，我还在脚本中包含了 echo exec('whoami'); ，以确认脚本正在由 www-data 运行.
I checked and pid 21931 was indeed one of the apache2 child processes running under www-data. As you can see, I also included echo exec('whoami'); in the script which confirmed the script was being run by www-data.
其他注意事项:
- PHP 未在安全模式下运行
- PHP
open_basedir未设置 - 版本信息:
Apache/2.2.16 (Debian) PHP/5.3.3-7+squeeze3 with Suhosin-Patch mod_ssl/2.2.16 OpenSSL/0.9.8o - uname -a:
2.6.32-238.19.1.el5.028stab092.2 #1 SMP Thu Jul 21 19:23:22 MSD 2011 x86_64 GNU/Linux - 这是在 OpenVZ 下运行的 VPS 上
- ls -l (file):
-rwxrwxrwx 1 www-data www-data 0 Sep 8 18:13 writetest.log - ls -l(目录):
drwxr-xr-x 2 www-data www-data 4096 Sep 8 18:13 writetest - Apache2的父进程运行在
root下，子进程运行在www-data - selinux 未安装(感谢 Fabio 提醒我提及这一点)
- 我已经多次重启 apache 并重启服务器
- PHP is not running in safe mode
- PHP
open_basediris not set - Version info:
Apache/2.2.16 (Debian) PHP/5.3.3-7+squeeze3 with Suhosin-Patch mod_ssl/2.2.16 OpenSSL/0.9.8o - uname -a:
2.6.32-238.19.1.el5.028stab092.2 #1 SMP Thu Jul 21 19:23:22 MSD 2011 x86_64 GNU/Linux - This is on a VPS running under OpenVZ
- ls -l (file):
-rwxrwxrwx 1 www-data www-data 0 Sep 8 18:13 writetest.log - ls -l (directory):
drwxr-xr-x 2 www-data www-data 4096 Sep 8 18:13 writetest - Apache2's parent process runs under
root, and the child processes underwww-data - selinux is not installed (thanks to Fabio for reminding me to mention this)
- I have restarted apache many times and rebooted the server as well
推荐答案
请记住，为了访问文件，所有父目录必须可以被 www-data 读取.您的 strace 输出似乎表明即使 accessing /var/log/apache2/writetest 也失败了.确保 www-data 对以下目录具有权限:
Remember that in order to reach a file, ALL parent directories must be readable by www-data. You strace output seems to indicate that even accessing /var/log/apache2/writetest is failing. Make sure that www-data has permissions on the following directories:
/(r-x)/var (r-x)/var/log (r-x)/var/log/apache2 (r-x)/var/log/apache2/writetest (rwx)/var/log/apache2/writetest/writetest.log (rw-)
这篇关于即使具有完全打开的权限，PHP fopen() 也会对文件失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！