I was having terrible troble alpine not running qemu guest agent. Most people suggest working with the openrc file. I just added the following to my /etc/local.d directory as a new file: qemu-ga.start
qemu-ga -m virtio-serial -p /dev/vport1p1 -l /var/log/qemu-ga.log -dThis seems to have fixed it qemu-ga is now running. Be sure to rc-update add local and make sure your file is executable. It should start on the next run.