The interesting lines there are:
Sep 20 16:36:40 infra2 maas.dhcp: [error] Could not remove host map for 52:54:00:1d:43:20: The DHCP server could not be reached.
Sep 20 16:36:40 infra2 maas.dhcp: [warn] Failed to update all host maps. Restarting DHCPv4 service to ensure host maps are in-sync.
after the reproduce i restarted maas-dhcpd on the primary controller and PXE booting worked again.
Here's the log from that: paste.ubuntu. com/25580768/
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The interesting lines there are:
Sep 20 16:36:40 infra2 maas.dhcp: [error] Could not remove host map for 52:54:00:1d:43:20: The DHCP server could not be reached.
Sep 20 16:36:40 infra2 maas.dhcp: [warn] Failed to update all host maps. Restarting DHCPv4 service to ensure host maps are in-sync.