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Add network-plugin-mtu option for MTU selection

Browse Source 
MTU selection is difficult, and if there is a transport such as IPSEC in
use may be impossible.  So we allow specification of the MTU with the
network-plugin-mtu flag, and we pass this down into the network
provider.

Currently implemented by kubenet.
This commit is contained in:
Justin Santa Barbara 2016-08-10 12:09:43 -04:00
parent 2c103af2b6
commit 902ba4e249
25 changed files with 2874 additions and 2759 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
cmd/kubelet/app/options/options.go
View File

@ -144,6 +144,7 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
fs.DurationVar(&s.VolumeStatsAggPeriod.Duration, "volume-stats-agg-period", s.VolumeStatsAggPeriod.Duration, "Specifies interval for kubelet to calculate and cache the volume disk usage for all pods and volumes. To disable volume calculations, set to 0. Default: '1m'")
fs.StringVar(&s.NetworkPluginName, "network-plugin", s.NetworkPluginName, "<Warning: Alpha feature> The name of the network plugin to be invoked for various events in kubelet/pod lifecycle")
fs.StringVar(&s.NetworkPluginDir, "network-plugin-dir", s.NetworkPluginDir, "<Warning: Alpha feature> The full path of the directory in which to search for network plugins")
fs.Int32Var(&s.NetworkPluginMTU, "network-plugin-mtu", s.NetworkPluginMTU, "<Warning: Alpha feature> The MTU to be passed to the network plugin, to override the default")
fs.StringVar(&s.VolumePluginDir, "volume-plugin-dir", s.VolumePluginDir, "<Warning: Alpha feature> The full path of the directory in which to search for additional third party volume plugins")
fs.StringVar(&s.CloudProvider, "cloud-provider", s.CloudProvider, "The provider for cloud services. By default, kubelet will attempt to auto-detect the cloud provider. Specify empty string for running with no cloud provider. [default=auto-detect]")
fs.StringVar(&s.CloudConfigFile, "cloud-config", s.CloudConfigFile, "The path to the cloud provider configuration file. Empty string for no configuration file.")

3
cmd/kubelet/app/server.go
View File

@ -260,6 +260,7 @@ func UnsecuredKubeletConfig(s *options.KubeletServer) (*KubeletConfig, error) {
MinimumGCAge: s.MinimumGCAge.Duration,
Mounter: mounter,
NetworkPluginName: s.NetworkPluginName,
NetworkPluginMTU: int(s.NetworkPluginMTU),
NetworkPlugins: ProbeNetworkPlugins(s.NetworkPluginDir),
NodeLabels: s.NodeLabels,
NodeStatusUpdateFrequency: s.NodeStatusUpdateFrequency.Duration,
@ -914,6 +915,7 @@ type KubeletConfig struct {
MinimumGCAge time.Duration
Mounter mount.Interface
NetworkPluginName string
NetworkPluginMTU int
NetworkPlugins []network.NetworkPlugin
NodeName string
NodeLabels map[string]string
@ -1016,6 +1018,7 @@ func CreateAndInitKubelet(kc *KubeletConfig) (k KubeletBootstrap, pc *config.Pod
kc.VolumePlugins,
kc.NetworkPlugins,
kc.NetworkPluginName,
kc.NetworkPluginMTU,
kc.StreamingConnectionIdleTimeout,
kc.Recorder,
kc.CAdvisorInterface,

1
hack/verify-flags/known-flags.txt
View File

@ -340,6 +340,7 @@ minion-path-override
namespace-sync-period
network-plugin
network-plugin-dir
network-plugin-mtu
no-headers
no-suggestions
node-cidr-mask-size

5495
pkg/apis/componentconfig/types.generated.go
View File

File diff suppressed because it is too large Load Diff

4
pkg/apis/componentconfig/types.go
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@ -252,6 +252,10 @@ type KubeletConfiguration struct {
// networkPluginName is the name of the network plugin to be invoked for
// various events in kubelet/pod lifecycle
NetworkPluginName string `json:"networkPluginName"`
// networkPluginMTU is the MTU to be passed to the network plugin,
// and overrides the default MTU for cases where it cannot be automatically
// computed (such as IPSEC).
NetworkPluginMTU int32 `json:"networkPluginMTU"`
// networkPluginDir is the full path of the directory in which to search
// for network plugins
NetworkPluginDir string `json:"networkPluginDir"`

4
pkg/apis/componentconfig/v1alpha1/types.go
View File

@ -310,6 +310,10 @@ type KubeletConfiguration struct {
// networkPluginDir is the full path of the directory in which to search
// for network plugins
NetworkPluginDir string `json:"networkPluginDir"`
// networkPluginMTU is the MTU to be passed to the network plugin,
// and overrides the default MTU for cases where it cannot be automatically
// computed (such as IPSEC).
NetworkPluginMTU int32 `json:"networkPluginMTU"`
// volumePluginDir is the full path of the directory in which to search
// for additional third party volume plugins
VolumePluginDir string `json:"volumePluginDir"`

2
pkg/apis/componentconfig/v1alpha1/zz_generated.conversion.go
View File

@ -233,6 +233,7 @@ func autoConvert_v1alpha1_KubeletConfiguration_To_componentconfig_KubeletConfigu
out.VolumeStatsAggPeriod = in.VolumeStatsAggPeriod
out.NetworkPluginName = in.NetworkPluginName
out.NetworkPluginDir = in.NetworkPluginDir
out.NetworkPluginMTU = in.NetworkPluginMTU
out.VolumePluginDir = in.VolumePluginDir
out.CloudProvider = in.CloudProvider
out.CloudConfigFile = in.CloudConfigFile
@ -408,6 +409,7 @@ func autoConvert_componentconfig_KubeletConfiguration_To_v1alpha1_KubeletConfigu
out.LowDiskSpaceThresholdMB = in.LowDiskSpaceThresholdMB
out.VolumeStatsAggPeriod = in.VolumeStatsAggPeriod
out.NetworkPluginName = in.NetworkPluginName
out.NetworkPluginMTU = in.NetworkPluginMTU
out.NetworkPluginDir = in.NetworkPluginDir
out.VolumePluginDir = in.VolumePluginDir
out.CloudProvider = in.CloudProvider

1
pkg/apis/componentconfig/v1alpha1/zz_generated.deepcopy.go
View File

@ -239,6 +239,7 @@ func DeepCopy_v1alpha1_KubeletConfiguration(in interface{}, out interface{}, c *
out.VolumeStatsAggPeriod = in.VolumeStatsAggPeriod
out.NetworkPluginName = in.NetworkPluginName
out.NetworkPluginDir = in.NetworkPluginDir
out.NetworkPluginMTU = in.NetworkPluginMTU
out.VolumePluginDir = in.VolumePluginDir
out.CloudProvider = in.CloudProvider
out.CloudConfigFile = in.CloudConfigFile

1
pkg/apis/componentconfig/zz_generated.deepcopy.go
View File

@ -257,6 +257,7 @@ func DeepCopy_componentconfig_KubeletConfiguration(in interface{}, out interface
out.LowDiskSpaceThresholdMB = in.LowDiskSpaceThresholdMB
out.VolumeStatsAggPeriod = in.VolumeStatsAggPeriod
out.NetworkPluginName = in.NetworkPluginName
out.NetworkPluginMTU = in.NetworkPluginMTU
out.NetworkPluginDir = in.NetworkPluginDir
out.VolumePluginDir = in.VolumePluginDir
out.CloudProvider = in.CloudProvider

3
pkg/kubelet/dockertools/docker_manager_test.go
View File

@ -122,7 +122,8 @@ func createTestDockerManager(fakeHTTPClient *fakeHTTP, fakeDocker *FakeDockerCli
"",
nettest.NewFakeHost(nil),
componentconfig.HairpinNone,
"10.0.0.0/8")
"10.0.0.0/8",
network.UseDefaultMTU)
dockerManager := NewFakeDockerManager(
fakeDocker,

2
pkg/kubelet/dockertools/docker_test.go
View File

@ -718,7 +718,7 @@ func TestFindContainersByPod(t *testing.T) {
},
}
fakeClient := NewFakeDockerClient()
np, _ := network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
np, _ := network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
// image back-off is set to nil, this test should not pull images
containerManager := NewFakeDockerManager(fakeClient, &record.FakeRecorder{}, nil, nil, &cadvisorapi.MachineInfo{}, "", 0, 0, "", &containertest.FakeOS{}, np, nil, nil, nil)
for i, test := range tests {

3
pkg/kubelet/kubelet.go
View File

@ -200,6 +200,7 @@ func NewMainKubelet(
volumePlugins []volume.VolumePlugin,
networkPlugins []network.NetworkPlugin,
networkPluginName string,
networkPluginMTU int,
streamingConnectionIdleTimeout time.Duration,
recorder record.EventRecorder,
cadvisorInterface cadvisor.Interface,
@ -399,7 +400,7 @@ func NewMainKubelet(
}
glog.Infof("Hairpin mode set to %q", klet.hairpinMode)
if plug, err := network.InitNetworkPlugin(networkPlugins, networkPluginName, &networkHost{klet}, klet.hairpinMode, klet.nonMasqueradeCIDR); err != nil {
if plug, err := network.InitNetworkPlugin(networkPlugins, networkPluginName, &networkHost{klet}, klet.hairpinMode, klet.nonMasqueradeCIDR, networkPluginMTU); err != nil {
return nil, err
} else {
klet.networkPlugin = plug

2
pkg/kubelet/kubelet_test.go
View File

@ -142,7 +142,7 @@ func newTestKubeletWithImageList(
kubelet.nodeName = testKubeletHostname
kubelet.runtimeState = newRuntimeState(maxWaitForContainerRuntime)
kubelet.runtimeState.setNetworkState(nil)
kubelet.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kubelet.nonMasqueradeCIDR)
kubelet.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kubelet.nonMasqueradeCIDR, 1440)
if tempDir, err := ioutil.TempDir("/tmp", "kubelet_test."); err != nil {
t.Fatalf("can't make a temp rootdir: %v", err)
} else {

1
pkg/kubelet/kuberuntime/kuberuntime_manager_test.go
View File

@ -46,6 +46,7 @@ func createTestRuntimeManager() (*apitest.FakeRuntimeService, *apitest.FakeImage
nettest.NewFakeHost(nil),
componentconfig.HairpinNone,
"10.0.0.0/8",
network.UseDefaultMTU,
)
osInterface := &containertest.FakeOS{}
manager, err := NewFakeKubeRuntimeManager(fakeRuntimeService, fakeImageService, networkPlugin, osInterface)

2
pkg/kubelet/network/cni/cni.go
View File

@ -136,7 +136,7 @@ func getLoNetwork(vendorDirPrefix string) *cniNetwork {
return loNetwork
}
func (plugin *cniNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (plugin *cniNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
var err error
plugin.nsenterPath, err = plugin.execer.LookPath("nsenter")
if err != nil {

2
pkg/kubelet/network/cni/cni_test.go
View File

@ -200,7 +200,7 @@ func TestCNIPlugin(t *testing.T) {
mockLoCNI.On("AddNetwork", cniPlugin.loNetwork.NetworkConfig, mock.AnythingOfType("*libcni.RuntimeConf")).Return(&cnitypes.Result{IP4: &cnitypes.IPConfig{IP: net.IPNet{IP: []byte{127, 0, 0, 1}}}}, nil)
plug, err := network.InitNetworkPlugin(plugins, "cni", NewFakeHost(nil, pods), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(plugins, "cni", NewFakeHost(nil, pods), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if err != nil {
t.Fatalf("Failed to select the desired plugin: %v", err)
}

2
pkg/kubelet/network/exec/exec.go
View File

@ -105,7 +105,7 @@ func ProbeNetworkPlugins(pluginDir string) []network.NetworkPlugin {
return execPlugins
}
func (plugin *execNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (plugin *execNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
err := plugin.validate()
if err != nil {
return err

16
pkg/kubelet/network/exec/exec_test.go
View File

@ -135,7 +135,7 @@ func TestSelectPlugin(t *testing.T) {
installPluginUnderTest(t, "", testPluginPath, pluginName, nil)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if err != nil {
t.Errorf("Failed to select the desired plugin: %v", err)
}
@ -157,7 +157,7 @@ func TestSelectVendoredPlugin(t *testing.T) {
installPluginUnderTest(t, vendor, testPluginPath, pluginName, nil)
vendoredPluginName := fmt.Sprintf("%s/%s", vendor, pluginName)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), vendoredPluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), vendoredPluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if err != nil {
t.Errorf("Failed to select the desired plugin: %v", err)
}
@ -178,7 +178,7 @@ func TestSelectWrongPlugin(t *testing.T) {
installPluginUnderTest(t, "", testPluginPath, pluginName, nil)
wrongPlugin := "abcd"
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), wrongPlugin, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), wrongPlugin, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if plug != nil || err == nil {
t.Errorf("Expected to see an error. Wrong plugin selected.")
}
@ -206,7 +206,7 @@ func TestPluginValidation(t *testing.T) {
}
f.Close()
_, err = network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
_, err = network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if err == nil {
// we expected an error here because validation would have failed
t.Errorf("Expected non-nil value.")
@ -224,7 +224,7 @@ func TestPluginSetupHook(t *testing.T) {
installPluginUnderTest(t, "", testPluginPath, pluginName, nil)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
err = plug.SetUpPod("podNamespace", "podName", kubecontainer.ContainerID{Type: "docker", ID: "dockerid2345"})
if err != nil {
@ -252,7 +252,7 @@ func TestPluginTearDownHook(t *testing.T) {
installPluginUnderTest(t, "", testPluginPath, pluginName, nil)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
err = plug.TearDownPod("podNamespace", "podName", kubecontainer.ContainerID{Type: "docker", ID: "dockerid2345"})
if err != nil {
@ -280,7 +280,7 @@ func TestPluginStatusHook(t *testing.T) {
installPluginUnderTest(t, "", testPluginPath, pluginName, nil)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
ip, err := plug.GetPodNetworkStatus("namespace", "name", kubecontainer.ContainerID{Type: "docker", ID: "dockerid2345"})
if err != nil {
@ -316,7 +316,7 @@ func TestPluginStatusHookIPv6(t *testing.T) {
}
installPluginUnderTest(t, "", testPluginPath, pluginName, execTemplate)
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := network.InitNetworkPlugin(ProbeNetworkPlugins(testPluginPath), pluginName, nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", network.UseDefaultMTU)
if err != nil {
t.Errorf("InitNetworkPlugin() failed: %v", err)
}

25
pkg/kubelet/network/kubenet/kubenet_linux.go
View File

@ -53,6 +53,9 @@ const (
DefaultCNIDir = "/opt/cni/bin"
sysctlBridgeCallIptables = "net/bridge/bridge-nf-call-iptables"
// fallbackMTU is used if an MTU is not specified, and we cannot determine the MTU
fallbackMTU = 1460
)
type kubenetNetworkPlugin struct {
@ -65,7 +68,7 @@ type kubenetNetworkPlugin struct {
bandwidthShaper bandwidth.BandwidthShaper
mu sync.Mutex //Mutex for protecting podIPs map, netConfig, and shaper initialization
podIPs map[kubecontainer.ContainerID]string
MTU int
mtu int
execer utilexec.Interface
nsenterPath string
hairpinMode componentconfig.HairpinMode
@ -82,19 +85,20 @@ func NewPlugin(networkPluginDir string) network.NetworkPlugin {
protocol := utiliptables.ProtocolIpv4
execer := utilexec.New()
dbus := utildbus.New()
sysctl := utilsysctl.New()
iptInterface := utiliptables.New(execer, dbus, protocol)
return &kubenetNetworkPlugin{
podIPs: make(map[kubecontainer.ContainerID]string),
MTU: 1460, //TODO: don't hardcode this
execer: utilexec.New(),
iptables: iptInterface,
sysctl: sysctl,
vendorDir: networkPluginDir,
hostportHandler: hostport.NewHostportHandler(),
nonMasqueradeCIDR: "10.0.0.0/8",
}
}
func (plugin *kubenetNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (plugin *kubenetNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
plugin.host = host
plugin.hairpinMode = hairpinMode
plugin.nonMasqueradeCIDR = nonMasqueradeCIDR
@ -102,11 +106,16 @@ func (plugin *kubenetNetworkPlugin) Init(host network.Host, hairpinMode componen
Path: []string{DefaultCNIDir, plugin.vendorDir},
}
if link, err := findMinMTU(); err == nil {
plugin.MTU = link.MTU
glog.V(5).Infof("Using interface %s MTU %d as bridge MTU", link.Name, link.MTU)
if mtu == network.UseDefaultMTU {
if link, err := findMinMTU(); err == nil {
plugin.mtu = link.MTU
glog.V(5).Infof("Using interface %s MTU %d as bridge MTU", link.Name, link.MTU)
} else {
plugin.mtu = fallbackMTU
glog.Warningf("Failed to find default bridge MTU, using %d: %v", fallbackMTU, err)
}
} else {
glog.Warningf("Failed to find default bridge MTU: %v", err)
plugin.mtu = mtu
}
// Since this plugin uses a Linux bridge, set bridge-nf-call-iptables=1
@ -224,7 +233,7 @@ func (plugin *kubenetNetworkPlugin) Event(name string, details map[string]interf
// Set bridge address to first address in IPNet
cidr.IP.To4()[3] += 1
json := fmt.Sprintf(NET_CONFIG_TEMPLATE, BridgeName, plugin.MTU, network.DefaultInterfaceName, setHairpin, podCIDR, cidr.IP.String())
json := fmt.Sprintf(NET_CONFIG_TEMPLATE, BridgeName, plugin.mtu, network.DefaultInterfaceName, setHairpin, podCIDR, cidr.IP.String())
glog.V(2).Infof("CNI network config set to %v", json)
plugin.netConfig, err = libcni.ConfFromBytes([]byte(json))
if err == nil {

43
pkg/kubelet/network/kubenet/kubenet_linux_test.go
View File

@ -24,6 +24,7 @@ import (
"testing"
"k8s.io/kubernetes/pkg/apis/componentconfig"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/network"
"k8s.io/kubernetes/pkg/kubelet/network/cni/testing"
@ -32,6 +33,7 @@ import (
"k8s.io/kubernetes/pkg/util/bandwidth"
"k8s.io/kubernetes/pkg/util/exec"
ipttest "k8s.io/kubernetes/pkg/util/iptables/testing"
sysctltest "k8s.io/kubernetes/pkg/util/sysctl/testing"
)
// test it fulfills the NetworkPlugin interface
@ -41,7 +43,7 @@ func newFakeKubenetPlugin(initMap map[kubecontainer.ContainerID]string, execer e
return &kubenetNetworkPlugin{
podIPs: initMap,
execer: execer,
MTU: 1460,
mtu: 1460,
host: host,
}
}
@ -157,4 +159,43 @@ func TestTeardownCallsShaper(t *testing.T) {
mockcni.AssertExpectations(t)
}
// TestInit tests that a `Init` call with an MTU sets the MTU
func TestInit_MTU(t *testing.T) {
var fakeCmds []exec.FakeCommandAction
{
// modprobe br-netfilter
fCmd := exec.FakeCmd{
CombinedOutputScript: []exec.FakeCombinedOutputAction{
func() ([]byte, error) {
return make([]byte, 0), nil
},
},
}
fakeCmds = append(fakeCmds, func(cmd string, args ...string) exec.Cmd {
return exec.InitFakeCmd(&fCmd, cmd, args...)
})
}
fexec := &exec.FakeExec{
CommandScript: fakeCmds,
LookPathFunc: func(file string) (string, error) {
return fmt.Sprintf("/fake-bin/%s", file), nil
},
}
fhost := nettest.NewFakeHost(nil)
kubenet := newFakeKubenetPlugin(map[kubecontainer.ContainerID]string{}, fexec, fhost)
kubenet.iptables = ipttest.NewFake()
sysctl := sysctltest.NewFake()
sysctl.Settings["net/bridge/bridge-nf-call-iptables"] = 0
kubenet.sysctl = sysctl
if err := kubenet.Init(nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", 1234); err != nil {
t.Fatalf("Unexpected error in Init: %v", err)
}
assert.Equal(t, 1234, kubenet.mtu, "kubenet.mtu should have been set")
assert.Equal(t, 1, sysctl.Settings["net/bridge/bridge-nf-call-iptables"], "net/bridge/bridge-nf-call-iptables sysctl should have been set")
}
//TODO: add unit test for each implementation of network plugin interface

2
pkg/kubelet/network/mock_network/network_plugins.go
View File

@ -78,7 +78,7 @@ func (_mr *_MockNetworkPluginRecorder) GetPodNetworkStatus(arg0, arg1, arg2 inte
return _mr.mock.ctrl.RecordCall(_mr.mock, "GetPodNetworkStatus", arg0, arg1, arg2)
}
func (_m *MockNetworkPlugin) Init(_param0 network.Host, _param1 componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (_m *MockNetworkPlugin) Init(_param0 network.Host, _param1 componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
ret := _m.ctrl.Call(_m, "Init", _param0, _param1)
ret0, _ := ret[0].(error)
return ret0

4
pkg/kubelet/network/network.go
View File

@ -18,3 +18,7 @@ package network
// TODO: Consider making this value configurable.
const DefaultInterfaceName = "eth0"
// UseDefaultMTU is a marker value that indicates the plugin should determine its own MTU
// It is the zero value, so a non-initialized value will mean "UseDefault"
const UseDefaultMTU = 0

10
pkg/kubelet/network/plugins.go
View File

@ -52,7 +52,7 @@ const (
type NetworkPlugin interface {
// Init initializes the plugin. This will be called exactly once
// before any other methods are called.
Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error
Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error
// Called on various events like:
// NET_PLUGIN_EVENT_POD_CIDR_CHANGE
@ -105,11 +105,11 @@ type Host interface {
}
// InitNetworkPlugin inits the plugin that matches networkPluginName. Plugins must have unique names.
func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) (NetworkPlugin, error) {
func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) (NetworkPlugin, error) {
if networkPluginName == "" {
// default to the no_op plugin
plug := &NoopNetworkPlugin{}
if err := plug.Init(host, hairpinMode, nonMasqueradeCIDR); err != nil {
if err := plug.Init(host, hairpinMode, nonMasqueradeCIDR, mtu); err != nil {
return nil, err
}
return plug, nil
@ -134,7 +134,7 @@ func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host H
chosenPlugin := pluginMap[networkPluginName]
if chosenPlugin != nil {
err := chosenPlugin.Init(host, hairpinMode, nonMasqueradeCIDR)
err := chosenPlugin.Init(host, hairpinMode, nonMasqueradeCIDR, mtu)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("Network plugin %q failed init: %v", networkPluginName, err))
} else {
@ -156,7 +156,7 @@ type NoopNetworkPlugin struct {
const sysctlBridgeCallIptables = "net/bridge/bridge-nf-call-iptables"
func (plugin *NoopNetworkPlugin) Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (plugin *NoopNetworkPlugin) Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
// Set bridge-nf-call-iptables=1 to maintain compatibility with older
// kubernetes versions to ensure the iptables-based kube proxy functions
// correctly. Other plugins are responsible for setting this correctly

2
pkg/kubelet/network/plugins_test.go
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@ -25,7 +25,7 @@ import (
func TestSelectDefaultPlugin(t *testing.T) {
all_plugins := []NetworkPlugin{}
plug, err := InitNetworkPlugin(all_plugins, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8")
plug, err := InitNetworkPlugin(all_plugins, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, "10.0.0.0/8", UseDefaultMTU)
if err != nil {
t.Fatalf("Unexpected error in selecting default plugin: %v", err)
}

2
pkg/kubelet/runonce_test.go
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@ -103,7 +103,7 @@ func TestRunOnce(t *testing.T) {
kb.getPodsDir(),
kb.recorder)
kb.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kb.nonMasqueradeCIDR)
kb.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kb.nonMasqueradeCIDR, network.UseDefaultMTU)
// TODO: Factor out "StatsProvider" from Kubelet so we don't have a cyclic dependency
volumeStatsAggPeriod := time.Second * 10
kb.resourceAnalyzer = stats.NewResourceAnalyzer(kb, volumeStatsAggPeriod, kb.containerRuntime)