Thanks for helping Mantas, What I saw is: - 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. 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 <graw...@gmail.com> wrote: > On Tue, Jun 1, 2021 at 10:07 AM Alessandro Tagliapietra < > tagliapietra.alessan...@gmail.com> 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 found >> > > My 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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