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I have read the canonical answer at What permissions should my website files/folders have on a Linux webserver?

However I'm still stuck. My setup is:

  • A developer user 'ade' who owns the directories and files that comprise a website
  • The server is nginx with php-fpm via a socket: fastcgi_pass unix:/tmp/php5-fpm.sock;
  • Website contains an uploads directory that must be writable by PHP when running in this configuration
  • I don't want to set permissions to 777, obviously

I have created a webadmin group and added both 'ade' and nginx to it:

$ groups ade
ade : ade webadmin

$ groups nginx
nginx : nginx webadmin

I have set the owner of everything in the site to be me and the webadmin group: chown ade:webadmin *

...as you can see:

drwxrwxr-x 2 ade webadmin 4096 Jul  3 13:58 logs
drwxrwxr-x 5 ade webadmin 4096 Jul  4 08:35 public
drwxrwxr-x 4 ade webadmin 4096 Jul  3 16:18 system
drwxrwsr-x 2 ade webadmin 4096 Jul  9 16:13 uploads

However despite the permissions of uploads being 775 (rwx for both user and group) nginx and php cannot write to the folder. Only if I set it to 777 can it upload images to it.

I saw the advice about using chmod u+w in the above canonical answer but don't understand why this is necessary.

  • Do you see any errors in the logs? What are the permissions and ownership of the parent directory for uploads? – SunSparc Jul 9 '13 at 16:32
  • 3
    What users is php-fpm running as? Have you made sure that user has access? – Zoredache Jul 9 '13 at 16:44
  • @Zoredache - Thanks - yes of course that's a different process. I set the group to webadmin (didn't know you could do that) and it's solved the problem. – Ade Jul 9 '13 at 17:30
  • You should self-answer your question with details about what you have changed. – Zoredache Jul 9 '13 at 17:33
  • @Zoredache yes, just did - thanks a lot. The fact that it's a socket connection should have made it obvious to me that it's running as a separate process rather than under nginx (as PHP does with mod_php in Apache) – Ade Jul 9 '13 at 17:39
3

Solved:

php-fpm doesn't run as the nginx user of course. It can be configured (in CentOS) in the file /etc/php-fpm.d/www.conf. I edited its config by adding line 45:

44  ;group = nobody
45  group = webadmin

Then restarted it:

sudo /etc/init.d/php-fpm restart

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