Possible alternative

[AverTry]

I use your script to get the guest agent on reboot, but thought you may be interested in my fluke start.

After installing pkg install qemu-guest-agent
I did service qemu-guest-agent start and was told it's not enabled.
So I did service qemu-guest-agent enable then service qemu-guest-agent start

And it was up and running.
But did not survive a reboot. That's how I came across your solution.

Is there a way to just run the start command or enable, start on bootup, as this may be a future proof solution, than editing files?
Thanks for your script, btw.

[boretom]

Is there a way to just run the start command or enable, start on bootup

I do use the 'Shellcmd' package, which is for executing commands at boot, to start the QEMU guest agent. To add the command go to Services / Shellcmds and add the commands as you type it in the shell.

[xpufx]

New packages to be INSTALLED:
        qemu-guest-agent: 8.1.1 [pfSense]

Number of packages to be installed: 1

The process will require 2 MiB more space.
247 KiB to be downloaded.

Proceed with this action? [y/N]: y
[1/1] Fetching qemu-guest-agent-8.1.1.pkg: 100%  247 KiB 253.2kB/s    00:01
Checking integrity... done (0 conflicting)
[1/1] Installing qemu-guest-agent-8.1.1...
[1/1] Extracting qemu-guest-agent-8.1.1: 100%
=====
Message from qemu-guest-agent-8.1.1:

--
To run the guest agent on startup:

sysrc qemu_guest_agent_enable="YES"

Start the service with:
service qemu-guest-agent start

Is this information inaccurate or was the package updated with a good startup script? I only did what the package told me to do and I can see the IP address of this vm on the proxmox gui now.