Thanks for helping Mantas,
- before first boot /etc/machine-id is empty (and I think that's expected)
- right after boot, /etc/machine-id isn't writable because the root fs is mounted as readonly from fstab
- after the /etc overlay is mounted /etc/machine-id should still be the one from the underlying filesystem and at this point is also writable, however it's still empty
During boot I see:
[ 3.577477] systemd[1]: Initializing machine ID from random generator.
[ 3.584284] systemd[1]: Installed transient /etc/machine-id file.
[ 3.584284] systemd[1]: Installed transient /etc/machine-id file.
however /etc/machine-id shouldn't be writable at that point, what should I do? Make our overlay mount unit depend on whatever service is generating machine-id and make sure our mount happens before the generation of machine-id?
Thanks
--
Alessandro Tagliapietra
On Tue, Jun 1, 2021 at 12:13 AM Mantas Mikulėnas <grawity@xxxxxxxxx> wrote:
On Tue, Jun 1, 2021 at 10:07 AM Alessandro Tagliapietra <tagliapietra.alessandro@xxxxxxxxx> wrote:Hello everyone,I'm using yocto to create a custom linux image for a raspberry pi.We have an "agent" that writes /etc/systemd/network/20-eth.network when the final user wants to have a static IP address and we remove the file when they switch back to DHCP.After creating/deleting the file above we run `networkctl reload && networkctl reconfigure eth0`.We mount the overlayfs with a custom .mount unit.We've noticed that DHCP works fine if systemd-networkd starts before we mount the overlayfs but it doesn't if systemd-networkd is restarted/reconfigured after the folder is mounted or started after the overlay .mount unit.Every interface DHCP fails with:DHCPv6 CLIENT: Failed to set DUID-EN: No medium found
eth0: DHCP6 CLIENT: Failed to set DUID: No medium foundMy guess is that it's related to /etc/machine-id somehow becoming inaccessible, since networkd's DUID-EN (DUIDType=vendor) is based on that.--Mantas Mikulėnas
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