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Being an avid StackExchange user, I could see how many users completely lack understanding of the proper permissions model in the most popular, LEMP stack.
You can see recommendations that 777 is never good, but I could not see a simple guide on permissions that can be used as a reference point for everyone.
The following permissions/ownership model applies to all NGINX/PHP-FPM websites and allows you to host websites without any problems, in a secure way.
PHP-FPM user (as known as the website user)
The PHP-FPM user should be a special user that you create for running your website, whether it is Magento, WordPress, or anything.
Its characteristics are the following:
- This is the user that PHP-FPM will execute scripts with
- This user must be unique. Do not reuse an existing user account. Create a separate user for each website!
- Do not reuse any
sudocapable users. If your website user is
root– you’re asking for much trouble.
- Do not use
nginxas website user. This is wrong and will lead to more troubles!
- The username should reflect either the domain name of the website that it “runs”, or the type of corresponding CMS, e.g.
magentofor a Magento website; or
Let’s create this user:
Now, set its password by running:
Each website in PHP-FPM should be run under a separate pool. In the pool settings file, e.g.
/etc/php-fpm.d/example.com.conf, you must set things to match with the created username:
listen = /var/run/php-fpm/example.com.sock listen.owner = example listen.group = example listen.mode = 0660 user = example group = example
The webserver user
NGINX must run with it own unprivileged user, which is
nginx (RHEL-based systems) or
www-data (Debian-based systems).
This is the “global” webserver user that is used for all websites. So the configuration is straightforward and translates to the following directives in
Connecting website and webserver users
Now the magic. We must connect things up so that NGINX (webserver) user can read files that belong to the website user’s group.
This will allow us to control what NGINX can read or not, via group chmod permission bit.
usermod -a -G example nginx
This reads as: add
nginx user to group
File ownership (
Here is a simple rule: all the files should be owned by the website user and the website user’s group:
chown -R example:example /path/to/website/files
The following general
chmod setup will allow for any website to function properly:
chmod -R u=rwX,g=rX,o= /path/to/website/files
This translates to the following:
- Website user (
example) can read, write all files and read all directories
- Website group (webserver user) can read all files and traverse all directories, but not write
- All other users cannot read or write anything
In octal notation, this results in
0750 chmod for all directories and
0640 for all files.
If you simply stick to this permissions model, you will not encounter any
chown issues in the future.
This is the only proper model, functionality, and security-wise.
These general permissions are quite secure already out of the box. But of course, if you know your website structure, you may want to tighten up permissions even further.
For example, see Magento 1.x lockdown chmod.