On this RHEL 8 documentation page:
Step 5 for setting up the tang server suggests editing the the port number of tang in this file:
However, by default, that is just a symlink back to the /usr/lib version of tangd.socket and may be overwritten by future RPM updates. The systemd documention says to copy this to /etc/systemd/system and then edit it and do a systemctl reenable .
Even other parts of the RHEL 8 documentation agree that this will be potentially override by normal patching and suggest (section 3.5.4) copying the /usr/lib/systemd/system/ version to /etc/systemd/system/, then doing a reenable and daemon-reload.
Please fix this documentation as this might cause critical production outages.