Merge pull request #32903 from yujuhong/enable_docker_shim

Automatic merge from submit-queue

kubelet: Add a hidden flag to enable docker CRI integration for testing

cmd/kubelet/app/options/options.go

@@ -221,4 +221,8 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&s.EvictionMinimumReclaim, "eviction-minimum-reclaim", s.EvictionMinimumReclaim, "A set of minimum reclaims (e.g. imagefs.available=2Gi) that describes the minimum amount of resource the kubelet will reclaim when performing a pod eviction if that resource is under pressure.")
 	fs.Int32Var(&s.PodsPerCore, "pods-per-core", s.PodsPerCore, "Number of Pods per core that can run on this Kubelet. The total number of Pods on this Kubelet cannot exceed max-pods, so max-pods will be used if this calculation results in a larger number of Pods allowed on the Kubelet. A value of 0 disables this limit.")
 	fs.BoolVar(&s.ProtectKernelDefaults, "protect-kernel-defaults", s.ProtectKernelDefaults, "Default kubelet behaviour for kernel tuning. If set, kubelet errors if any of kernel tunables is different than kubelet defaults.")
+
+	// Hidden flags for experimental features that are still under development.
+	fs.StringVar(&s.ExperimentalRuntimeIntegrationType, "experimental-runtime-integration-type", s.ExperimentalRuntimeIntegrationType, "Choose the integration path for the container runtime (specified via --container-runtime). Currently, this supports only Docker. If set to \"cri\", Kubelet will use interact with docker through the new Container Runtime Interface.")
+	fs.MarkHidden("experimental-runtime-integration-type")
 }

hack/verify-flags/known-flags.txt

@@ -175,6 +175,7 @@ experimental-flannel-overlay
 experimental-keystone-url
 experimental-nvidia-gpus
 experimental-prefix
+experimental-runtime-integration-type
 external-hostname
 external-ip
 extra-peer-dirs

pkg/apis/componentconfig/types.go

@@ -427,6 +427,9 @@ type KubeletConfiguration struct {
 	IPTablesDropBit int32 `json:"iptablesDropBit"`
 	// Whitelist of unsafe sysctls or sysctl patterns (ending in *).
 	AllowedUnsafeSysctls []string `json:"experimentalAllowedUnsafeSysctls,omitempty"`
+	// How to integrate with runtime. If set to cri, kubelet will switch to
+	// using the new Container Runtine Interface.
+	ExperimentalRuntimeIntegrationType string `json:"experimentalRuntimeIntegrationType,omitempty"`
 }
 
 type KubeSchedulerConfiguration struct {

pkg/apis/componentconfig/v1alpha1/types.go

@@ -483,4 +483,7 @@ type KubeletConfiguration struct {
 	// Whitelist of unsafe sysctls or sysctl patterns (ending in *). Use these at your own risk.
 	// Resource isolation might be lacking and pod might influence each other on the same node.
 	AllowedUnsafeSysctls []string `json:"allowedUnsafeSysctls,omitempty"`
+	// How to integrate with runtime. If set to CRI, kubelet will switch to
+	// using the new Container Runtine Interface.
+	ExperimentalRuntimeIntegrationType string `json:"experimentalRuntimeIntegrationType,omitempty"`
 }

pkg/apis/componentconfig/v1alpha1/zz_generated.conversion.go

@@ -335,6 +335,7 @@ func autoConvert_v1alpha1_KubeletConfiguration_To_componentconfig_KubeletConfigu
 		return err
 	}
 	out.AllowedUnsafeSysctls = in.AllowedUnsafeSysctls
+	out.ExperimentalRuntimeIntegrationType = in.ExperimentalRuntimeIntegrationType
 	return nil
 }
 
@@ -515,6 +516,7 @@ func autoConvert_componentconfig_KubeletConfiguration_To_v1alpha1_KubeletConfigu
 		return err
 	}
 	out.AllowedUnsafeSysctls = in.AllowedUnsafeSysctls
+	out.ExperimentalRuntimeIntegrationType = in.ExperimentalRuntimeIntegrationType
 	return nil
 }
 

pkg/apis/componentconfig/v1alpha1/zz_generated.deepcopy.go

@@ -411,6 +411,7 @@ func DeepCopy_v1alpha1_KubeletConfiguration(in interface{}, out interface{}, c *
 		} else {
 			out.AllowedUnsafeSysctls = nil
 		}
+		out.ExperimentalRuntimeIntegrationType = in.ExperimentalRuntimeIntegrationType
 		return nil
 	}
 }

pkg/apis/componentconfig/zz_generated.deepcopy.go

@@ -347,6 +347,7 @@ func DeepCopy_componentconfig_KubeletConfiguration(in interface{}, out interface
 		} else {
 			out.AllowedUnsafeSysctls = nil
 		}
+		out.ExperimentalRuntimeIntegrationType = in.ExperimentalRuntimeIntegrationType
 		return nil
 	}
 }

pkg/genericapiserver/openapi/zz_generated.openapi.go

@@ -2875,8 +2875,15 @@ func (_ openAPI) OpenAPIDefinitions() *common.OpenAPIDefinitions {
 								},
 							},
 						},
+						"ExperimentalRuntimeIntegrationType": {
+							SchemaProps: spec.SchemaProps{
+								Description: "How to integrate with runtime. If set to CRI, kubelet will switch to using the new Container Runtine Interface.",
+								Type:        []string{"string"},
+								Format:      "",
 							},
-					Required: []string{"TypeMeta", "podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginMTU", "networkPluginDir", "cniConfDir", "cniBinDir", "volumePluginDir", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "lockFilePath", "exitOnLockContention", "configureCbr0", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "reconcileCIDR", "registerSchedulable", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "experimentalFlannelOverlay", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "podsPerCore", "enableControllerAttachDetach", "systemReserved", "kubeReserved", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit"},
+						},
+					},
+					Required: []string{"TypeMeta", "podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginMTU", "networkPluginDir", "cniConfDir", "cniBinDir", "volumePluginDir", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "lockFilePath", "exitOnLockContention", "configureCbr0", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "reconcileCIDR", "registerSchedulable", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "experimentalFlannelOverlay", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "podsPerCore", "enableControllerAttachDetach", "systemReserved", "kubeReserved", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit", "ExperimentalRuntimeIntegrationType"},
 				},
 			},
 			Dependencies: []string{
@@ -14260,8 +14267,15 @@ func (_ openAPI) OpenAPIDefinitions() *common.OpenAPIDefinitions {
 								},
 							},
 						},
+						"ExperimentalRuntimeIntegrationType": {
+							SchemaProps: spec.SchemaProps{
+								Description: "How to integrate with runtime. If set to CRI, kubelet will switch to using the new Container Runtine Interface.",
+								Type:        []string{"string"},
+								Format:      "",
 							},
-					Required: []string{"TypeMeta", "podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginDir", "cniConfDir", "cniBinDir", "networkPluginMTU", "volumePluginDir", "cloudProvider", "cloudConfigFile", "kubeletCgroups", "runtimeCgroups", "systemCgroups", "cgroupRoot", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "runtimeRequestTimeout", "rktPath", "rktAPIEndpoint", "rktStage1Image", "lockFilePath", "exitOnLockContention", "configureCbr0", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "reconcileCIDR", "registerSchedulable", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "experimentalFlannelOverlay", "outOfDiskTransitionFrequency", "nodeIP", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "evictionHard", "evictionSoft", "evictionSoftGracePeriod", "evictionPressureTransitionPeriod", "evictionMaxPodGracePeriod", "evictionMinimumReclaim", "podsPerCore", "enableControllerAttachDetach", "systemReserved", "kubeReserved", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit"},
+						},
+					},
+					Required: []string{"TypeMeta", "podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginDir", "cniConfDir", "cniBinDir", "networkPluginMTU", "volumePluginDir", "cloudProvider", "cloudConfigFile", "kubeletCgroups", "runtimeCgroups", "systemCgroups", "cgroupRoot", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "runtimeRequestTimeout", "rktPath", "rktAPIEndpoint", "rktStage1Image", "lockFilePath", "exitOnLockContention", "configureCbr0", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "reconcileCIDR", "registerSchedulable", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "experimentalFlannelOverlay", "outOfDiskTransitionFrequency", "nodeIP", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "evictionHard", "evictionSoft", "evictionSoftGracePeriod", "evictionPressureTransitionPeriod", "evictionMaxPodGracePeriod", "evictionMinimumReclaim", "podsPerCore", "enableControllerAttachDetach", "systemReserved", "kubeReserved", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit", "ExperimentalRuntimeIntegrationType"},
 				},
 			},
 			Dependencies: []string{

pkg/kubelet/kubelet.go

@@ -51,6 +51,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/cm"
 	"k8s.io/kubernetes/pkg/kubelet/config"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+	"k8s.io/kubernetes/pkg/kubelet/dockershim"
 	"k8s.io/kubernetes/pkg/kubelet/dockertools"
 	"k8s.io/kubernetes/pkg/kubelet/envvars"
 	"k8s.io/kubernetes/pkg/kubelet/events"
@@ -544,6 +545,30 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 	// Initialize the runtime.
 	switch kubeCfg.ContainerRuntime {
 	case "docker":
+		switch kubeCfg.ExperimentalRuntimeIntegrationType {
+		case "cri":
+			// Use the new CRI shim for docker. This is need for testing the
+			// docker integration through CRI, and may be removed in the future.
+			dockerService := dockershim.NewDockerService(klet.dockerClient)
+			klet.containerRuntime, err = kuberuntime.NewKubeGenericRuntimeManager(
+				kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
+				klet.livenessManager,
+				containerRefManager,
+				klet.podManager,
+				kubeDeps.OSInterface,
+				klet.networkPlugin,
+				klet,
+				klet.httpClient,
+				imageBackOff,
+				kubeCfg.SerializeImagePulls,
+				klet.cpuCFSQuota,
+				dockerService,
+				dockerService,
+			)
+			if err != nil {
+				return nil, err
+			}
+		default:
 			// Only supported one for now, continue.
 			klet.containerRuntime = dockertools.NewDockerManager(
 				kubeDeps.DockerClient,
@@ -577,6 +602,7 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 				kubeCfg.SeccompProfileRoot,
 				kubeDeps.ContainerRuntimeOptions...,
 			)
+		}
 	case "rkt":
 		// TODO: Include hairpin mode settings in rkt?
 		conf := &rkt.Config{

pkg/kubelet/kuberuntime/kuberuntime_image.go

@@ -17,8 +17,6 @@ limitations under the License.
 package kuberuntime
 
 import (
-	"fmt"
-
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/credentialprovider"
@@ -130,7 +128,8 @@ func (m *kubeGenericRuntimeManager) RemoveImage(image kubecontainer.ImageSpec) e
 }
 
 // ImageStats returns the statistics of the image.
+// TODO: Implement this function.
 func (m *kubeGenericRuntimeManager) ImageStats() (*kubecontainer.ImageStats, error) {
-	// TODO: support image stats in new runtime interface
+	var usageBytes uint64 = 0
-	return nil, fmt.Errorf("not implemented")
+	return &kubecontainer.ImageStats{TotalStorageBytes: usageBytes}, nil
 }

pkg/kubelet/sysctl/runtime.go

@@ -27,6 +27,10 @@ import (
 
 const (
 	UnsupportedReason = "SysctlUnsupported"
+	// CRI uses semver-compatible API version, while docker does not
+	// (e.g., 1.24). Append the version with a ".0" so that it works
+	// with both the CRI and dockertools comparison logic.
+	dockerMinimumAPIVersion = "1.24.0"
 )
 
 type runtimeAdmitHandler struct {
@@ -45,7 +49,7 @@ func NewRuntimeAdmitHandler(runtime container.Runtime) (*runtimeAdmitHandler, er
 		}
 
 		// only Docker >= 1.12 supports sysctls
-		c, err := v.Compare(dockertools.DockerV112APIVersion)
+		c, err := v.Compare(dockerMinimumAPIVersion)
 		if err != nil {
 			return nil, fmt.Errorf("failed to compare Docker version for sysctl support: %v", err)
 		}