I read a book about security in web servers and I found this:
If your web server has the ability to write to the ﬁles in your WordPress directories, then the automatic upgrade functionality works. If not,WordPress prompts for your FTP credentials to update the ﬁles for you. Both of these situations concern us. In general, your web user should not have write permissions to your entire web root. This is just asking for trouble, especially on a shared hosting platform; realizing, of course, that certain directories such as the uploads folder must be writable by the web user in order to function.
Professional Wordpress by Hal Stern
What I want to ask is who is the web user of my server? I'm using Nginx and PHP5-FPM. The web root folder of my server is owned by raymond:raymond. Nginx is running as nginx:nginx and PHP5-FPM's listen.owner is set to raymond and listen.group is also set to raymond
The web root directory permissions is drwxr-x-r-x, my public_html is also set like that.
So how can I know if I'm in trouble with this setup?
BTW, I'm using Linode for my host! I'm not in a shared hosting environment. Thanks!