[DOC IMPROVE] RHEL install guide with SELinux for JDisc connection

[MichaelOv]

Affected Article

• Link to the article: https://kb.i-doit.com/en/installation/manual-installation/red-hat-enterprise-linux/index.html#next-step

Suggested Improvements

SELinux may prevent /usr/sbin/php-fpm from accessing tcp_socket port 25321 with name_connect access.

Text Proposals

!!! note "If you plan to use JDisc, you should tell SELinux that php-fpm is allowed to access the JDisc port. To do this, assign the port to a suitable SELinux port type like:

sudo semanage port -a -t postgresql_port_t -p tcp 25321