On Mon, 13 Jul 2020, Simon Matter via CentOS-devel wrote:
Guess what? Upon termination, wpa-supplicant brings the wireless interface down and the system hangs being unable to unmount now-defunct NFSroot.
This sounds like a use case for a 'unit' file. See man 5 systemd.unit
wpa-supplicant is providing 'network' and being shut down 'too early
I use the following unit file, to mount a NFS point after the network is up (wotjh tje 'After'), and systemd will retain the network in an up state so loong as the mount point it up (with the 'Wants')
# less /etc/systemd/system/var-ftp-pub-nfs-mirror.mount
[Unit] Description=var-ftp-pub-nfs-mirror devices Wants=network-online.target After=network-online.target Conflicts=umount.target [Mount] What=nas1.first.owlriver.net:/Mirror Where=/var/ftp/pub/nfs/mirror Type=nfs
[Install] WantedBy=machines.target
#######################
Rename the unit file with the mount point name, and drop it in the indicated directory path [it is unclear to me if this needs to be in the datastick you are initially booting from, or in the filesystem once active .. some experimentation needed here. It may well be both ;) You may find more guidance in a writeup on a wired PXE / TFTP boot ] (see: man 5 systemd.unit )
and one assumes wpa-supplicant is already designated as part of the 'network' service, and so will be retrained in an active state unti the umount of listed NFS mounts are completed
-- Russ herrold