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Route .vm DNS through systemd-resolved

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Banger was already serving VM records on 127.0.0.1:42069, but hosts using systemd-resolved were not routing .vm queries there. That made direct lookups against the local server work while normal host resolution and commands like opencode attach <vm>.vm:4096 failed.\n\nSync resolvectl dns/domain/default-route settings onto the banger bridge when the daemon opens and whenever VM DNS records are published, and revert that bridge-scoped configuration on daemon shutdown. This uses sudo resolvectl because unprivileged resolved reconfiguration on this host requires interactive authentication.\n\nValidation: GOCACHE=/tmp/banger-gocache go test ./..., make build, daemon restart, resolvectl dns/domain br-fc, resolvectl query vrum.vm, and curl http://vrum.vm:4096.
This commit is contained in:
Thales Maciel 2026-03-22 15:07:22 -03:00
parent 0ad3dae502
commit b7f6d1fe1b
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GPG key ID: 33112E6833C34679
4 changed files with 145 additions and 2 deletions
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6
internal/daemon/vm.go
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@ -1271,7 +1271,11 @@ func (d *Daemon) setDNS(ctx context.Context, vmName, guestIP string) error {
if d.vmDNS == nil {
return nil
}
return d.vmDNS.Set(vmdns.RecordName(vmName), guestIP)
if err := d.vmDNS.Set(vmdns.RecordName(vmName), guestIP); err != nil {
return err
}
d.ensureVMDNSResolverRouting(ctx)
return nil
}
func (d *Daemon) removeDNS(ctx context.Context, dnsName string) error {