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Merge pull request #86493 from aojea/kubeadmAddress
kubeadm: use bind-address instead of address to configure the http probes
This commit is contained in:
commit
3760d24674
@ -38,11 +38,11 @@ import (
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)
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const (
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// kubeControllerManagerAddressArg represents the address argument of the kube-controller-manager configuration.
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kubeControllerManagerAddressArg = "address"
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// kubeControllerManagerBindAddressArg represents the bind-address argument of the kube-controller-manager configuration.
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kubeControllerManagerBindAddressArg = "bind-address"
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// kubeSchedulerAddressArg represents the address argument of the kube-scheduler configuration.
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kubeSchedulerAddressArg = "address"
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// kubeSchedulerBindAddressArg represents the bind-address argument of the kube-scheduler configuration.
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kubeSchedulerBindAddressArg = "bind-address"
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)
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// ComponentPod returns a Pod object from the container and volume specifications
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@ -244,7 +244,7 @@ func GetAPIServerProbeAddress(endpoint *kubeadmapi.APIEndpoint) string {
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// probes do not support the Downward API we cannot dynamically set the advertise address to
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// the node's IP. The only option then is to use localhost.
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if endpoint != nil && endpoint.AdvertiseAddress != "" {
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return endpoint.AdvertiseAddress
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return getProbeAddress(endpoint.AdvertiseAddress)
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}
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return "127.0.0.1"
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@ -252,16 +252,16 @@ func GetAPIServerProbeAddress(endpoint *kubeadmapi.APIEndpoint) string {
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// GetControllerManagerProbeAddress returns the kubernetes controller manager probe address
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func GetControllerManagerProbeAddress(cfg *kubeadmapi.ClusterConfiguration) string {
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if addr, exists := cfg.ControllerManager.ExtraArgs[kubeControllerManagerAddressArg]; exists {
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return addr
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if addr, exists := cfg.ControllerManager.ExtraArgs[kubeControllerManagerBindAddressArg]; exists {
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return getProbeAddress(addr)
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}
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return "127.0.0.1"
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}
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// GetSchedulerProbeAddress returns the kubernetes scheduler probe address
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func GetSchedulerProbeAddress(cfg *kubeadmapi.ClusterConfiguration) string {
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if addr, exists := cfg.Scheduler.ExtraArgs[kubeSchedulerAddressArg]; exists {
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return addr
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if addr, exists := cfg.Scheduler.ExtraArgs[kubeSchedulerBindAddressArg]; exists {
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return getProbeAddress(addr)
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}
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return "127.0.0.1"
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}
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@ -321,3 +321,16 @@ func ManifestFilesAreEqual(path1, path2 string) (bool, error) {
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return bytes.Equal(content1, content2), nil
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}
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// getProbeAddress returns a valid probe address.
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// Kubeadm uses the bind-address to configure the probe address. It's common to use the
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// unspecified address "0.0.0.0" or "::" as bind-address when we want to listen in all interfaces,
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// however this address can't be used as probe #86504.
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// If the address is an unspecified address getProbeAddress returns empty,
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// that means that kubelet will use the PodIP as probe address.
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func getProbeAddress(addr string) string {
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if addr == "0.0.0.0" || addr == "::" {
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return ""
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}
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return addr
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}
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@ -72,6 +72,20 @@ func TestGetAPIServerProbeAddress(t *testing.T) {
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},
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expected: "2001:abcd:bcda::1",
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},
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{
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desc: "filled in 0.0.0.0 AdvertiseAddress endpoint returns empty",
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endpoint: &kubeadmapi.APIEndpoint{
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AdvertiseAddress: "0.0.0.0",
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},
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expected: "",
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},
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{
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desc: "filled in :: AdvertiseAddress endpoint returns empty",
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endpoint: &kubeadmapi.APIEndpoint{
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AdvertiseAddress: "::",
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},
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expected: "",
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},
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}
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for _, test := range tests {
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@ -104,7 +118,7 @@ func TestGetControllerManagerProbeAddress(t *testing.T) {
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cfg: &kubeadmapi.ClusterConfiguration{
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ControllerManager: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeControllerManagerAddressArg: "10.10.10.10",
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kubeControllerManagerBindAddressArg: "10.10.10.10",
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},
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},
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},
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@ -115,12 +129,34 @@ func TestGetControllerManagerProbeAddress(t *testing.T) {
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cfg: &kubeadmapi.ClusterConfiguration{
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ControllerManager: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeControllerManagerAddressArg: "2001:abcd:bcda::1",
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kubeControllerManagerBindAddressArg: "2001:abcd:bcda::1",
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},
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},
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},
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expected: "2001:abcd:bcda::1",
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},
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{
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desc: "setting controller manager extra address arg to 0.0.0.0 returns empty",
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cfg: &kubeadmapi.ClusterConfiguration{
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ControllerManager: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeControllerManagerBindAddressArg: "0.0.0.0",
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},
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},
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},
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expected: "",
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},
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{
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desc: "setting controller manager extra ipv6 address arg to :: returns empty",
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cfg: &kubeadmapi.ClusterConfiguration{
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ControllerManager: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeControllerManagerBindAddressArg: "::",
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},
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},
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},
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expected: "",
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},
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}
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for _, test := range tests {
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@ -133,6 +169,76 @@ func TestGetControllerManagerProbeAddress(t *testing.T) {
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}
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}
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func TestGetSchedulerProbeAddress(t *testing.T) {
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tests := []struct {
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desc string
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cfg *kubeadmapi.ClusterConfiguration
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expected string
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}{
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{
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desc: "no scheduler extra args leads to 127.0.0.1 being used",
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cfg: &kubeadmapi.ClusterConfiguration{
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Scheduler: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{},
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},
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},
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expected: "127.0.0.1",
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},
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{
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desc: "setting scheduler extra address arg to something acknowledges it",
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cfg: &kubeadmapi.ClusterConfiguration{
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Scheduler: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeSchedulerBindAddressArg: "10.10.10.10",
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},
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},
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},
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expected: "10.10.10.10",
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},
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{
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desc: "setting scheduler extra ipv6 address arg to something acknowledges it",
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cfg: &kubeadmapi.ClusterConfiguration{
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Scheduler: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeSchedulerBindAddressArg: "2001:abcd:bcda::1",
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},
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},
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},
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expected: "2001:abcd:bcda::1",
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},
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{
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desc: "setting scheduler extra ipv6 address arg to 0.0.0.0 returns empty",
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cfg: &kubeadmapi.ClusterConfiguration{
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Scheduler: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeSchedulerBindAddressArg: "0.0.0.0",
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},
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},
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},
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expected: "",
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},
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{
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desc: "setting scheduler extra ipv6 address arg to :: returns empty",
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cfg: &kubeadmapi.ClusterConfiguration{
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Scheduler: kubeadmapi.ControlPlaneComponent{
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ExtraArgs: map[string]string{
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kubeSchedulerBindAddressArg: "::",
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},
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},
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},
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expected: "",
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},
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}
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for _, test := range tests {
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t.Run(test.desc, func(t *testing.T) {
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actual := GetSchedulerProbeAddress(test.cfg)
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if actual != test.expected {
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t.Errorf("Unexpected result from GetSchedulerProbeAddress:\n\texpected: %s\n\tactual: %s", test.expected, actual)
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}
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})
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}
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}
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func TestGetEtcdProbeEndpoint(t *testing.T) {
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var tests = []struct {
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name string
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