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Replace mapdns with daemon DNS

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Serve daemon-managed .vm names directly from bangerd on 127.0.0.1:42069 instead of shelling out to mapdns. This keeps DNS state tied to VM lifecycle and lets the daemon rebuild records from running VMs after startup or reconcile.

Add a small in-process authoritative DNS server, register and remove records from the VM start/stop/delete paths, and show the listener in daemon status. Remove the mapdns config and preflight surface, stop helper-flow DNS publishing in customize.sh and interactive.sh, drop dns.sh from the runtime bundle, and update docs/tests for the new local-resolver integration model.

Validated with GOCACHE=/tmp/banger-gocache go test ./..., GOCACHE=/tmp/banger-gocache make build, and bash -n customize.sh interactive.sh.
This commit is contained in:
Thales Maciel 2026-03-17 15:49:35 -03:00
parent 430f66d5dd
commit 0a0b0b617b
No known key found for this signature in database
GPG key ID: 33112E6833C34679
24 changed files with 576 additions and 278 deletions
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54
internal/daemon/daemon_test.go
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@ -283,58 +283,36 @@ func writeDefaultImageArtifacts(t *testing.T, dir string) (rootfs, kernel, initr
return rootfs, kernel, initrd, modulesDir, packages
}
func TestSetDNSUsesConfiguredMapDNSDataFile(t *testing.T) {
func TestStartVMDNSFailsWhenAddressBusy(t *testing.T) {
t.Parallel()
dataFile := filepath.Join(t.TempDir(), "mapdns", "records.json")
runner := &scriptedRunner{
t: t,
steps: []runnerStep{
{
call: runnerCall{
name: "custom-mapdns",
args: []string{"set", "--data-file", dataFile, "devbox.vm", "172.16.0.8"},
},
},
},
}
d := &Daemon{
runner: runner,
config: model.DaemonConfig{
MapDNSBin: "custom-mapdns",
MapDNSDataFile: dataFile,
},
packetConn, err := net.ListenPacket("udp", "127.0.0.1:0")
if err != nil {
t.Fatalf("ListenPacket: %v", err)
}
defer packetConn.Close()
if err := d.setDNS(context.Background(), "devbox", "172.16.0.8"); err != nil {
t.Fatalf("setDNS: %v", err)
d := &Daemon{}
if err := d.startVMDNS(packetConn.LocalAddr().String()); err == nil {
t.Fatal("startVMDNS() succeeded on occupied address, want failure")
}
runner.assertExhausted()
}
func TestSetDNSUsesMapDNSDefaultsWhenDataFileUnset(t *testing.T) {
func TestSetDNSPublishesIntoDaemonServer(t *testing.T) {
t.Parallel()
runner := &scriptedRunner{
t: t,
steps: []runnerStep{
{
call: runnerCall{
name: "mapdns",
args: []string{"set", "devbox.vm", "172.16.0.8"},
},
},
},
}
d := &Daemon{
runner: runner,
config: model.DaemonConfig{},
d := &Daemon{}
if err := d.startVMDNS("127.0.0.1:0"); err != nil {
t.Fatalf("startVMDNS: %v", err)
}
defer d.stopVMDNS()
if err := d.setDNS(context.Background(), "devbox", "172.16.0.8"); err != nil {
t.Fatalf("setDNS: %v", err)
}
runner.assertExhausted()
if _, ok := d.vmDNS.Lookup("devbox.vm"); !ok {
t.Fatal("devbox.vm missing after setDNS")
}
}
func TestDispatchUsesPassedContext(t *testing.T) {