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cmd/{containerboot,k8s-operator}: allow users to define tailnet egress target by FQDN (#10360)

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* cmd/containerboot: proxy traffic to tailnet target defined by FQDN

Add a new Service annotation tailscale.com/tailnet-fqdn that
users can use to specify a tailnet target for which
an egress proxy should be deployed in the cluster.

Updates tailscale/tailscale#10280

Signed-off-by: Irbe Krumina <irbe@tailscale.com>
pull/10378/head
Irbe Krumina 1 year ago committed by GitHub
parent 2a01df97b8
commit 18ceb4e1f6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 298 additions and 44 deletions
Show Stats Download Patch File Download Diff File

121
cmd/containerboot/main.go
Unescape Escape View File

@ -17,7 +17,9 @@
// - TS_DEST_IP: proxy all incoming Tailscale traffic to the given
// destination.
// - TS_TAILNET_TARGET_IP: proxy all incoming non-Tailscale traffic to the given
// destination.
// destination defined by an IP.
// - TS_TAILNET_TARGET_FQDN: proxy all incoming non-Tailscale traffic to the given
// destination defined by a MagicDNS name.
// - TS_TAILSCALED_EXTRA_ARGS: extra arguments to 'tailscaled'.
// - TS_EXTRA_ARGS: extra arguments to 'tailscale up'.
// - TS_USERSPACE: run with userspace networking (the default)
@ -78,6 +80,7 @@ import (
"golang.org/x/sys/unix"
"tailscale.com/client/tailscale"
"tailscale.com/ipn"
"tailscale.com/tailcfg"
"tailscale.com/types/logger"
"tailscale.com/types/ptr"
"tailscale.com/util/deephash"
@ -96,24 +99,25 @@ func main() {
tailscale.I_Acknowledge_This_API_Is_Unstable = true
cfg := &settings{
AuthKey: defaultEnvs([]string{"TS_AUTHKEY", "TS_AUTH_KEY"}, ""),
Hostname: defaultEnv("TS_HOSTNAME", ""),
Routes: defaultEnv("TS_ROUTES", ""),
ServeConfigPath: defaultEnv("TS_SERVE_CONFIG", ""),
ProxyTo: defaultEnv("TS_DEST_IP", ""),
TailnetTargetIP: defaultEnv("TS_TAILNET_TARGET_IP", ""),
DaemonExtraArgs: defaultEnv("TS_TAILSCALED_EXTRA_ARGS", ""),
ExtraArgs: defaultEnv("TS_EXTRA_ARGS", ""),
InKubernetes: os.Getenv("KUBERNETES_SERVICE_HOST") != "",
UserspaceMode: defaultBool("TS_USERSPACE", true),
StateDir: defaultEnv("TS_STATE_DIR", ""),
AcceptDNS: defaultBool("TS_ACCEPT_DNS", false),
KubeSecret: defaultEnv("TS_KUBE_SECRET", "tailscale"),
SOCKSProxyAddr: defaultEnv("TS_SOCKS5_SERVER", ""),
HTTPProxyAddr: defaultEnv("TS_OUTBOUND_HTTP_PROXY_LISTEN", ""),
Socket: defaultEnv("TS_SOCKET", "/tmp/tailscaled.sock"),
AuthOnce: defaultBool("TS_AUTH_ONCE", false),
Root: defaultEnv("TS_TEST_ONLY_ROOT", "/"),
AuthKey: defaultEnvs([]string{"TS_AUTHKEY", "TS_AUTH_KEY"}, ""),
Hostname: defaultEnv("TS_HOSTNAME", ""),
Routes: defaultEnv("TS_ROUTES", ""),
ServeConfigPath: defaultEnv("TS_SERVE_CONFIG", ""),
ProxyTo: defaultEnv("TS_DEST_IP", ""),
TailnetTargetIP: defaultEnv("TS_TAILNET_TARGET_IP", ""),
TailnetTargetFQDN: defaultEnv("TS_TAILNET_TARGET_FQDN", ""),
DaemonExtraArgs: defaultEnv("TS_TAILSCALED_EXTRA_ARGS", ""),
ExtraArgs: defaultEnv("TS_EXTRA_ARGS", ""),
InKubernetes: os.Getenv("KUBERNETES_SERVICE_HOST") != "",
UserspaceMode: defaultBool("TS_USERSPACE", true),
StateDir: defaultEnv("TS_STATE_DIR", ""),
AcceptDNS: defaultBool("TS_ACCEPT_DNS", false),
KubeSecret: defaultEnv("TS_KUBE_SECRET", "tailscale"),
SOCKSProxyAddr: defaultEnv("TS_SOCKS5_SERVER", ""),
HTTPProxyAddr: defaultEnv("TS_OUTBOUND_HTTP_PROXY_LISTEN", ""),
Socket: defaultEnv("TS_SOCKET", "/tmp/tailscaled.sock"),
AuthOnce: defaultBool("TS_AUTH_ONCE", false),
Root: defaultEnv("TS_TEST_ONLY_ROOT", "/"),
}
if cfg.ProxyTo != "" && cfg.UserspaceMode {
@ -123,13 +127,19 @@ func main() {
if cfg.TailnetTargetIP != "" && cfg.UserspaceMode {
log.Fatal("TS_TAILNET_TARGET_IP is not supported with TS_USERSPACE")
}
if cfg.TailnetTargetFQDN != "" && cfg.UserspaceMode {
log.Fatal("TS_TAILNET_TARGET_FQDN is not supported with TS_USERSPACE")
}
if cfg.TailnetTargetFQDN != "" && cfg.TailnetTargetIP != "" {
log.Fatal("Both TS_TAILNET_TARGET_IP and TS_TAILNET_FQDN cannot be set")
}
if !cfg.UserspaceMode {
if err := ensureTunFile(cfg.Root); err != nil {
log.Fatalf("Unable to create tuntap device file: %v", err)
}
if cfg.ProxyTo != "" || cfg.Routes != "" || cfg.TailnetTargetIP != "" {
if err := ensureIPForwarding(cfg.Root, cfg.ProxyTo, cfg.TailnetTargetIP, cfg.Routes); err != nil {
if cfg.ProxyTo != "" || cfg.Routes != "" || cfg.TailnetTargetIP != "" || cfg.TailnetTargetFQDN != "" {
if err := ensureIPForwarding(cfg.Root, cfg.ProxyTo, cfg.TailnetTargetIP, cfg.TailnetTargetFQDN, cfg.Routes); err != nil {
log.Printf("Failed to enable IP forwarding: %v", err)
log.Printf("To run tailscale as a proxy or router container, IP forwarding must be enabled.")
if cfg.InKubernetes {
@ -294,12 +304,14 @@ authLoop:
}
var (
wantProxy = cfg.ProxyTo != "" || cfg.TailnetTargetIP != ""
wantProxy = cfg.ProxyTo != "" || cfg.TailnetTargetIP != "" || cfg.TailnetTargetFQDN != ""
wantDeviceInfo = cfg.InKubernetes && cfg.KubeSecret != "" && cfg.KubernetesCanPatch
startupTasksDone = false
currentIPs deephash.Sum // tailscale IPs assigned to device
currentDeviceInfo deephash.Sum // device ID and fqdn
currentEgressIPs deephash.Sum
certDomain = new(atomic.Pointer[string])
certDomainChanged = make(chan bool, 1)
)
@ -352,6 +364,45 @@ runLoop:
addrs := n.NetMap.SelfNode.Addresses().AsSlice()
newCurrentIPs := deephash.Hash(&addrs)
ipsHaveChanged := newCurrentIPs != currentIPs
if cfg.TailnetTargetFQDN != "" {
var (
egressAddrs []netip.Prefix
newCurentEgressIPs deephash.Sum
egressIPsHaveChanged bool
node tailcfg.NodeView
nodeFound bool
)
for _, n := range n.NetMap.Peers {
if strings.EqualFold(n.Name(), cfg.TailnetTargetFQDN) {
node = n
nodeFound = true
break
}
}
if !nodeFound {
log.Printf("Tailscale node %q not found; it either does not exist, or not reachable because of ACLs", cfg.TailnetTargetFQDN)
break
}
egressAddrs = node.Addresses().AsSlice()
newCurentEgressIPs = deephash.Hash(&egressAddrs)
egressIPsHaveChanged = newCurentEgressIPs != currentEgressIPs
if egressIPsHaveChanged && len(egressAddrs) > 0 {
for _, egressAddr := range egressAddrs {
ea := egressAddr.Addr()
// TODO (irbekrm): make it work for IPv6 too.
if ea.Is6() {
log.Println("Not installing egress forwarding rules for IPv6 as this is currently not supported")
continue
}
log.Printf("Installing forwarding rules for destination %v", ea.String())
if err := installEgressForwardingRule(ctx, ea.String(), addrs, nfr); err != nil {
log.Fatalf("installing egress proxy rules for destination %s: %v", ea.String(), err)
}
}
}
currentEgressIPs = newCurentEgressIPs
}
if cfg.ProxyTo != "" && len(addrs) > 0 && ipsHaveChanged {
log.Printf("Installing proxy rules")
if err := installIngressForwardingRule(ctx, cfg.ProxyTo, addrs, nfr); err != nil {
@ -369,6 +420,7 @@ runLoop:
}
}
if cfg.TailnetTargetIP != "" && ipsHaveChanged && len(addrs) > 0 {
log.Printf("Installing forwarding rules for destination %v", cfg.TailnetTargetIP)
if err := installEgressForwardingRule(ctx, cfg.TailnetTargetIP, addrs, nfr); err != nil {
log.Fatalf("installing egress proxy rules: %v", err)
}
@ -389,10 +441,10 @@ runLoop:
log.Println("Startup complete, waiting for shutdown signal")
startupTasksDone = true
// // Reap all processes, since we are PID1 and need to collect zombies. We can
// // only start doing this once we've stopped shelling out to things
// // `tailscale up`, otherwise this goroutine can reap the CLI subprocesses
// // and wedge bringup.
// Reap all processes, since we are PID1 and need to collect zombies. We can
// only start doing this once we've stopped shelling out to things
// `tailscale up`, otherwise this goroutine can reap the CLI subprocesses
// and wedge bringup.
reaper := func() {
defer wg.Done()
for {
@ -644,7 +696,7 @@ func ensureTunFile(root string) error {
}
// ensureIPForwarding enables IPv4/IPv6 forwarding for the container.
func ensureIPForwarding(root, clusterProxyTarget, tailnetTargetiP, routes string) error {
func ensureIPForwarding(root, clusterProxyTarget, tailnetTargetiP, tailnetTargetFQDN, routes string) error {
var (
v4Forwarding, v6Forwarding bool
)
@ -670,6 +722,11 @@ func ensureIPForwarding(root, clusterProxyTarget, tailnetTargetiP, routes string
v6Forwarding = true
}
}
// Currently we only proxy traffic to the IPv4 address of the tailnet
// target.
if tailnetTargetFQDN != "" {
v4Forwarding = true
}
if routes != "" {
for _, route := range strings.Split(routes, ",") {
cidr, err := netip.ParsePrefix(route)
@ -781,9 +838,13 @@ type settings struct {
// is done. This is typically a locally reachable IP.
ProxyTo string
// TailnetTargetIP is the destination IP to which all incoming
// non-Tailscale traffic should be proxied. If empty, no
// proxying is done. This is typically a Tailscale IP.
TailnetTargetIP string
// non-Tailscale traffic should be proxied. This is typically a
// Tailscale IP.
TailnetTargetIP string
// TailnetTargetFQDN is an MagicDNS name to which all incoming
// non-Tailscale traffic should be proxied. This must be a full Tailnet
// node FQDN.
TailnetTargetFQDN string
ServeConfigPath string
DaemonExtraArgs string
ExtraArgs string

8
cmd/k8s-operator/operator.go
Unescape Escape View File

@ -10,6 +10,7 @@ package main
import (
"context"
"os"
"regexp"
"strings"
"time"
@ -322,3 +323,10 @@ func serviceHandler(_ context.Context, o client.Object) []reconcile.Request {
}
}
// isMagicDNSName reports whether name is a full tailnet node FQDN (with or
// without final dot).
func isMagicDNSName(name string) bool {
validMagicDNSName := regexp.MustCompile(`^[a-zA-Z0-9-]+\.[a-zA-Z0-9-]+\.ts\.net\.?$`)
return validMagicDNSName.MatchString(name)
}

152
cmd/k8s-operator/operator_test.go
Unescape Escape View File

@ -159,6 +159,119 @@ func TestLoadBalancerClass(t *testing.T) {
}
expectEqual(t, fc, want)
}
func TestTailnetTargetFQDNAnnotation(t *testing.T) {
fc := fake.NewFakeClient()
ft := &fakeTSClient{}
zl, err := zap.NewDevelopment()
if err != nil {
t.Fatal(err)
}
tailnetTargetFQDN := "foo.bar.ts.net."
sr := &ServiceReconciler{
Client: fc,
ssr: &tailscaleSTSReconciler{
Client: fc,
tsClient: ft,
defaultTags: []string{"tag:k8s"},
operatorNamespace: "operator-ns",
proxyImage: "tailscale/tailscale",
},
logger: zl.Sugar(),
}
// Create a service that we should manage, and check that the initial round
// of objects looks right.
mustCreate(t, fc, &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: "test",
Namespace: "default",
// The apiserver is supposed to set the UID, but the fake client
// doesn't. So, set it explicitly because other code later depends
// on it being set.
UID: types.UID("1234-UID"),
Annotations: map[string]string{
AnnotationTailnetTargetFQDN: tailnetTargetFQDN,
},
},
Spec: corev1.ServiceSpec{
Type: corev1.ServiceTypeClusterIP,
Selector: map[string]string{
"foo": "bar",
},
},
})
expectReconciled(t, sr, "default", "test")
fullName, shortName := findGenName(t, fc, "default", "test")
expectEqual(t, fc, expectedSecret(fullName))
expectEqual(t, fc, expectedHeadlessService(shortName))
o := stsOpts{
name: shortName,
secretName: fullName,
tailnetTargetFQDN: tailnetTargetFQDN,
hostname: "default-test",
}
expectEqual(t, fc, expectedSTS(o))
want := &corev1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: "test",
Namespace: "default",
Finalizers: []string{"tailscale.com/finalizer"},
UID: types.UID("1234-UID"),
Annotations: map[string]string{
AnnotationTailnetTargetFQDN: tailnetTargetFQDN,
},
},
Spec: corev1.ServiceSpec{
ExternalName: fmt.Sprintf("%s.operator-ns.svc.cluster.local", shortName),
Type: corev1.ServiceTypeExternalName,
Selector: nil,
},
}
expectEqual(t, fc, want)
expectEqual(t, fc, expectedSecret(fullName))
expectEqual(t, fc, expectedHeadlessService(shortName))
o = stsOpts{
name: shortName,
secretName: fullName,
tailnetTargetFQDN: tailnetTargetFQDN,
hostname: "default-test",
}
expectEqual(t, fc, expectedSTS(o))
// Change the tailscale-target-fqdn annotation which should update the
// StatefulSet
tailnetTargetFQDN = "bar.baz.ts.net"
mustUpdate(t, fc, "default", "test", func(s *corev1.Service) {
s.ObjectMeta.Annotations = map[string]string{
AnnotationTailnetTargetFQDN: tailnetTargetFQDN,
}
})
// Remove the tailscale-target-fqdn annotation which should make the
// operator clean up
mustUpdate(t, fc, "default", "test", func(s *corev1.Service) {
s.ObjectMeta.Annotations = map[string]string{}
})
expectReconciled(t, sr, "default", "test")
// // synchronous StatefulSet deletion triggers a requeue. But, the StatefulSet
// // didn't create any child resources since this is all faked, so the
// // deletion goes through immediately.
expectReconciled(t, sr, "default", "test")
expectMissing[appsv1.StatefulSet](t, fc, "operator-ns", shortName)
// // The deletion triggers another reconcile, to finish the cleanup.
expectReconciled(t, sr, "default", "test")
expectMissing[appsv1.StatefulSet](t, fc, "operator-ns", shortName)
expectMissing[corev1.Service](t, fc, "operator-ns", shortName)
expectMissing[corev1.Secret](t, fc, "operator-ns", fullName)
}
func TestTailnetTargetIPAnnotation(t *testing.T) {
fc := fake.NewFakeClient()
ft := &fakeTSClient{}
@ -271,10 +384,6 @@ func TestTailnetTargetIPAnnotation(t *testing.T) {
expectMissing[appsv1.StatefulSet](t, fc, "operator-ns", shortName)
expectMissing[corev1.Service](t, fc, "operator-ns", shortName)
expectMissing[corev1.Secret](t, fc, "operator-ns", fullName)
// At the moment we don't revert changes to the user created Service -
// we don't have a reliable way how to tell what it was before and also
// we don't really expect it to be re-used
}
func TestAnnotations(t *testing.T) {
@ -987,6 +1096,13 @@ func expectedSTS(opts stsOpts) *appsv1.StatefulSet {
Name: "TS_TAILNET_TARGET_IP",
Value: opts.tailnetTargetIP,
})
} else if opts.tailnetTargetFQDN != "" {
annots["tailscale.com/operator-last-set-ts-tailnet-target-fqdn"] = opts.tailnetTargetFQDN
containerEnv = append(containerEnv, corev1.EnvVar{
Name: "TS_TAILNET_TARGET_FQDN",
Value: opts.tailnetTargetFQDN,
})
} else {
containerEnv = append(containerEnv, corev1.EnvVar{
Name: "TS_DEST_IP",
@ -1194,6 +1310,7 @@ type stsOpts struct {
priorityClassName string
firewallMode string
tailnetTargetIP string
tailnetTargetFQDN string
}
type fakeTSClient struct {
@ -1232,3 +1349,30 @@ func (c *fakeTSClient) Deleted() []string {
defer c.Unlock()
return c.deleted
}
func Test_isMagicDNSName(t *testing.T) {
tests := []struct {
in string
want bool
}{
{
in: "foo.tail4567.ts.net",
want: true,
},
{
in: "foo.tail4567.ts.net.",
want: true,
},
{
in: "foo.tail4567",
want: false,
},
}
for _, tt := range tests {
t.Run(tt.in, func(t *testing.T) {
if got := isMagicDNSName(tt.in); got != tt.want {
t.Errorf("isMagicDNSName(%q) = %v, want %v", tt.in, got, tt.want)
}
})
}
}

23
cmd/k8s-operator/sts.go
Unescape Escape View File

@ -47,15 +47,18 @@ const (
AnnotationHostname = "tailscale.com/hostname"
annotationTailnetTargetIPOld = "tailscale.com/ts-tailnet-target-ip"
AnnotationTailnetTargetIP = "tailscale.com/tailnet-ip"
//MagicDNS name of tailnet node.
AnnotationTailnetTargetFQDN = "tailscale.com/tailnet-fqdn"
// Annotations settable by users on ingresses.
AnnotationFunnel = "tailscale.com/funnel"
// Annotations set by the operator on pods to trigger restarts when the
// hostname or IP changes.
podAnnotationLastSetClusterIP = "tailscale.com/operator-last-set-cluster-ip"
podAnnotationLastSetHostname = "tailscale.com/operator-last-set-hostname"
podAnnotationLastSetTailnetTargetIP = "tailscale.com/operator-last-set-ts-tailnet-target-ip"
// hostname, IP or FQDN changes.
podAnnotationLastSetClusterIP = "tailscale.com/operator-last-set-cluster-ip"
podAnnotationLastSetHostname = "tailscale.com/operator-last-set-hostname"
podAnnotationLastSetTailnetTargetIP = "tailscale.com/operator-last-set-ts-tailnet-target-ip"
podAnnotationLastSetTailnetTargetFQDN = "tailscale.com/operator-last-set-ts-tailnet-target-fqdn"
)
type tailscaleSTSConfig struct {
@ -70,6 +73,9 @@ type tailscaleSTSConfig struct {
// Tailscale IP of a Tailscale service we are setting up egress for
TailnetTargetIP string
// Tailscale FQDN of a Tailscale service we are setting up egress for
TailnetTargetFQDN string
Hostname string
Tags []string // if empty, use defaultTags
}
@ -382,7 +388,11 @@ func (a *tailscaleSTSReconciler) reconcileSTS(ctx context.Context, logger *zap.S
Name: "TS_TAILNET_TARGET_IP",
Value: sts.TailnetTargetIP,
})
} else if sts.TailnetTargetFQDN != "" {
container.Env = append(container.Env, corev1.EnvVar{
Name: "TS_TAILNET_TARGET_FQDN",
Value: sts.TailnetTargetFQDN,
})
} else if sts.ServeConfig != nil {
container.Env = append(container.Env, corev1.EnvVar{
Name: "TS_SERVE_CONFIG",
@ -438,6 +448,9 @@ func (a *tailscaleSTSReconciler) reconcileSTS(ctx context.Context, logger *zap.S
if sts.TailnetTargetIP != "" {
ss.Spec.Template.Annotations[podAnnotationLastSetTailnetTargetIP] = sts.TailnetTargetIP
}
if sts.TailnetTargetFQDN != "" {
ss.Spec.Template.Annotations[podAnnotationLastSetTailnetTargetFQDN] = sts.TailnetTargetFQDN
}
ss.Spec.Template.Labels = map[string]string{
"app": sts.ParentResourceUID,
}

38
cmd/k8s-operator/svc.go
Unescape Escape View File

@ -81,7 +81,8 @@ func (a *ServiceReconciler) Reconcile(ctx context.Context, req reconcile.Request
return reconcile.Result{}, fmt.Errorf("failed to get svc: %w", err)
}
targetIP := a.tailnetTargetAnnotation(svc)
if !svc.DeletionTimestamp.IsZero() || !a.shouldExpose(svc) && targetIP == "" {
targetFQDN := svc.Annotations[AnnotationTailnetTargetFQDN]
if !svc.DeletionTimestamp.IsZero() || !a.shouldExpose(svc) && targetIP == "" && targetFQDN == "" {
logger.Debugf("service is being deleted or is (no longer) referring to Tailscale ingress/egress, ensuring any created resources are cleaned up")
return reconcile.Result{}, a.maybeCleanup(ctx, logger, svc)
}
@ -139,15 +140,21 @@ func (a *ServiceReconciler) maybeCleanup(ctx context.Context, logger *zap.Sugare
// This function adds a finalizer to svc, ensuring that we can handle orderly
// deprovisioning later.
func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.SugaredLogger, svc *corev1.Service) error {
// run for proxy config related validations here as opposed to running
// them earlier. This is to prevent cleanup etc being blocked on a
// misconfigured proxy param
// Run for proxy config related validations here as opposed to running
// them earlier. This is to prevent cleanup being blocked on a
// misconfigured proxy param.
if err := a.ssr.validate(); err != nil {
msg := fmt.Sprintf("unable to provision proxy resources: invalid config: %v", err)
a.recorder.Event(svc, corev1.EventTypeWarning, "INVALIDCONFIG", msg)
a.logger.Error(msg)
return nil
}
if violations := validateService(svc); len(violations) > 0 {
msg := fmt.Sprintf("unable to provision proxy resources: invalid Service: %s", strings.Join(violations, ", "))
a.recorder.Event(svc, corev1.EventTypeWarning, "INVALIDSERVCICE", msg)
a.logger.Error(msg)
return nil
}
hostname, err := nameForService(svc)
if err != nil {
return err
@ -187,6 +194,14 @@ func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.Suga
sts.TailnetTargetIP = ip
a.managedEgressProxies.Add(svc.UID)
gaugeEgressProxies.Set(int64(a.managedEgressProxies.Len()))
} else if fqdn := svc.Annotations[AnnotationTailnetTargetFQDN]; fqdn != "" {
fqdn := svc.Annotations[AnnotationTailnetTargetFQDN]
if !strings.HasSuffix(fqdn, ".") {
fqdn = fqdn + "."
}
sts.TailnetTargetFQDN = fqdn
a.managedEgressProxies.Add(svc.UID)
gaugeEgressProxies.Set(int64(a.managedEgressProxies.Len()))
}
a.mu.Unlock()
@ -195,7 +210,7 @@ func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.Suga
return fmt.Errorf("failed to provision: %w", err)
}
if sts.TailnetTargetIP != "" {
if sts.TailnetTargetIP != "" || sts.TailnetTargetFQDN != "" {
// TODO (irbekrm): cluster.local is the default DNS name, but
// can be changed by users. Make this configurable or figure out
// how to discover the DNS name from within operator
@ -254,6 +269,19 @@ func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.Suga
return nil
}
func validateService(svc *corev1.Service) []string {
violations := make([]string, 0)
if svc.Annotations[AnnotationTailnetTargetFQDN] != "" && svc.Annotations[AnnotationTailnetTargetIP] != "" {
violations = append(violations, "only one of annotations %s and %s can be set", AnnotationTailnetTargetIP, AnnotationTailnetTargetFQDN)
}
if fqdn := svc.Annotations[AnnotationTailnetTargetFQDN]; fqdn != "" {
if !isMagicDNSName(fqdn) {
violations = append(violations, fmt.Sprintf("invalid value of annotation %s: %q does not appear to be a valid MagicDNS name", AnnotationTailnetTargetFQDN, fqdn))
}
}
return violations
}
func (a *ServiceReconciler) shouldExpose(svc *corev1.Service) bool {
// Headless services can't be exposed, since there is no ClusterIP to
// forward to.

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