The single-nic IP migration path was fragile and caused connectivity
issues during setup. macvlan is now the only bridge strategy — always
creates spx-ext-{nic} on the WAN NIC. Removed --single-nic flag,
SingleNIC config/detection fields, and updated all docs.
When setup-ovn.sh migrates the WAN IP from a physical NIC to
br-external, systemd-resolved loses its DNS association (DNS servers
are per-interface). This breaks hostname resolution for everything
on the host — git, apt, curl, SSH all fail.
Now captures DNS config from the original interface before migration
and re-associates it with br-external via resolvectl. Falls back to
8.8.8.8 if no DNS was configured on the original interface.
spx admin init now works with zero external networking flags:
- Auto-detects WAN interface, gateway, prefix from ip route
- Auto-detects single-NIC vs multi-NIC mode
- Defaults to nat mode with DHCP for gateway IP
- Prints detected topology with interface roles
setup-ovn.sh gains --dhcp flag: obtains a DHCP lease on the
macvlan/bridge interface for the OVN gateway SNAT address, then
writes gateway_ip into spinifex.toml. Tested on VM: macvlan gets
separate IP from router DHCP, host keeps its original IP.
Three tiers of external networking:
- Zero flags: auto nat+DHCP (VMs get outbound internet)
- --external-pool=start-end: pool mode (VMs get public IPs)
- --no-external: overlay only (no internet for VMs)
Add --single-nic flag to setup-ovn.sh. When used with --external-bridge,
creates a macvlan sub-interface (spx-ext-{iface}) in bridge mode off the
host's NIC instead of adding the NIC directly to br-external. The host
keeps its IP — no migration, SSH-safe.
Strategy selection:
- Dedicated NIC: --external-iface=eth1 (add directly)
- Single NIC: --external-iface=eth0 --single-nic (macvlan)
- IP migration: --external-iface=eth0 (legacy, no --single-nic)
Add single_nic bool field to VPCDConfig for per-node config. Different
nodes in a cluster can use different strategies. Unit test verifies
single_nic parsing alongside external_interface.
Add external IPAM module (CAS-based IP allocation from admin-defined
pools in NATS KV). Supports multi-pool with region/AZ scoping, pool
fallback logic, gateway IP reservation, and concurrent allocation via
CAS retries. 12 unit tests covering allocation, release, exhaustion,
CAS conflict, multi-pool, fallback, validation, and idempotent init.
Add --external-bridge flag to setup-ovn.sh: creates OVS bridge
br-external, adds WAN NIC, migrates host IP to bridge, and sets
ovn-bridge-mappings=external:br-external for OVN localnet ports.
Add commented [network] section and external_interface to spinifex.toml
config template for discoverability.
Ben Duncan