I guess I should have been clear on that. I am doing _everything_ from a terminal rather than upgrading from the web UI. The systemd service says that nagios is happily running. (just not upgraded)
● nagios.service - Nagios Core 4.4.13
Loaded: loaded (/usr/lib/systemd/system/nagios.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2023-11-16 07:18:45 PST; 20min ago
Docs:
https://www.nagios.org/documentation
Process: 2316625 ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Process: 2316623 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Main PID: 2316626 (nagios)
Tasks: 26 (limit: 102126)
Memory: 30.5M
CGroup: /system.slice/nagios.service
├─2316626 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
├─2316627 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316628 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316629 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316630 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316631 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316632 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316633 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316634 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316635 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316636 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316637 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─2316638 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
└─2316658 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
Also noticed that when I login to the webUI (which works) I see that the monitoring engine process is not running. Attempts to restart it fail.