Hello everyone,
I struggled a bit getting Grav working on a Redhat Enterprise Linux 8 system using nginx as the webserver. I am posting this here in case anyone encounters the issue. The error that appears is that PHP throws an exception that it cannot read session data from or write to /var/lib/php/session.
The error message was
Failed to start session: session_start(): Failed to read session data: files (path: /var/lib/php/session)
The problem turned out to be subtle assumption on the part of the installation of php-fpm, which was that it provided a group id of apache for the session folder under /var/lib/php.
To get grav to work, I needed to follow the specific instructions about Permissions in the documentation, including the context change command shown at the bottom of this page under "SElinux-specific advice."
The assumption made by the installation of php-fpm is that apache is the webserver. So, the group permissions look like this:
ls -l /var/lib/php
total 0
drwxrwx---. 2 root apache 6 Jul 7 2022 opcache
drwxr-xr-x. 2 root root 30 Feb 28 13:10 peclxml
drwxrwx---. 2 root apache 123 Feb 28 13:30 session
drwxrwx---. 2 root apache 6 Jul 7 2022 wsdlcache
So despite the advice not to change permissions of system files in /etc/php-fpm.d/www.conf, I did so anyway and it worked. I also changed the permissions of opcache & wsdlcache simply to match the same pattern:
ls -l /var/lib/php
total 0
drwxrwx---. 2 root nginx 6 Jul 7 2022 opcache
drwxr-xr-x. 2 root root 30 Feb 28 13:10 peclxml
drwxrwx---. 2 root nginx 123 Feb 28 13:30 session
drwxrwx---. 2 root nginx 6 Jul 7 2022 wsdlcache
One could also change the configuration of nginix to run as user and group apache, I suppose.
Thanks to the developers of grav for all their hard work. I'm looking forward to using it now that I have it installed.
Regards,
David