move runonce from flag to config

Author: vincent178

cmd/kubelet/app/options/options.go

@@ -61,13 +61,6 @@ type KubeletFlags struct {
 	// Crash immediately, rather than eating panics.
 	ReallyCrashForTesting bool
 
-	// TODO(mtaufen): It is increasingly looking like nobody actually uses the
-	//                Kubelet's runonce mode anymore, so it may be a candidate
-	//                for deprecation and removal.
-	// If runOnce is true, the Kubelet will check the API server once for pods,
-	// run those in addition to the pods specified by static pod files, and exit.
-	RunOnce bool
-
 	// enableServer enables the Kubelet's server
 	EnableServer bool
 
@@ -360,7 +353,6 @@ func (f *KubeletFlags) AddFlags(mainfs *pflag.FlagSet) {
 	fs.BoolVar(&f.ReallyCrashForTesting, "really-crash-for-testing", f.ReallyCrashForTesting, "If true, when panics occur crash. Intended for testing.")
 	fs.Float64Var(&f.ChaosChance, "chaos-chance", f.ChaosChance, "If > 0.0, introduce random client errors and latency. Intended for testing.")
 
-	fs.BoolVar(&f.RunOnce, "runonce", f.RunOnce, "If true, exit after spawning pods from static pod files or remote urls. Exclusive with --enable-server")
 	fs.BoolVar(&f.EnableServer, "enable-server", f.EnableServer, "Enable the Kubelet's server")
 
 	fs.StringVar(&f.HostnameOverride, "hostname-override", f.HostnameOverride, "If non-empty, will use this string as identification instead of the actual hostname. If --cloud-provider is set, the cloud provider determines the name of the node (consult cloud provider documentation to determine if and how the hostname is used).")
@@ -528,6 +520,9 @@ func AddKubeletConfigFlags(mainfs *pflag.FlagSet, c *kubeletconfig.KubeletConfig
 	fs.Int64Var(&c.PodPidsLimit, "pod-max-pids", c.PodPidsLimit, "Set the maximum number of processes per pod.  If -1, the kubelet defaults to the node allocatable pid capacity.")
 
 	fs.StringVar(&c.ResolverConfig, "resolv-conf", c.ResolverConfig, "Resolver configuration file used as the basis for the container DNS resolution configuration.")
+
+	fs.BoolVar(&c.RunOnce, "runonce", c.RunOnce, "If true, exit after spawning pods from static pod files or remote urls. Exclusive with --enable-server")
+
 	fs.BoolVar(&c.CPUCFSQuota, "cpu-cfs-quota", c.CPUCFSQuota, "Enable CPU CFS quota enforcement for containers that specify CPU limits")
 	fs.DurationVar(&c.CPUCFSQuotaPeriod.Duration, "cpu-cfs-quota-period", c.CPUCFSQuotaPeriod.Duration, "Sets CPU CFS quota period value, cpu.cfs_period_us, defaults to Linux Kernel default")
 	fs.BoolVar(&c.EnableControllerAttachDetach, "enable-controller-attach-detach", c.EnableControllerAttachDetach, "Enables the Attach/Detach controller to manage attachment/detachment of volumes scheduled to this node, and disables kubelet from executing any attach/detach operations")

pkg/kubelet/apis/config/helpers_test.go

@@ -214,6 +214,7 @@ var (
 		"RegistryPullQPS",
 		"ReservedSystemCPUs",
 		"RuntimeRequestTimeout.Duration",
+		"RunOnce",
 		"SerializeImagePulls",
 		"ShowHiddenMetricsForVersion",
 		"StreamingConnectionIdleTimeout.Duration",

pkg/kubelet/apis/config/types.go

@@ -238,6 +238,9 @@ type KubeletConfiguration struct {
 	// ResolverConfig is the resolver configuration file used as the basis
 	// for the container DNS resolution configuration.
 	ResolverConfig string
+	// RunOnce causes the Kubelet to check the API server once for pods,
+	// run those in addition to the pods specified by static pod files, and exit.
+	RunOnce bool
 	// cpuCFSQuota enables CPU CFS quota enforcement for containers that
 	// specify CPU limits
 	CPUCFSQuota bool

pkg/kubelet/apis/config/v1beta1/zz_generated.conversion.go

@@ -490,6 +490,11 @@ type KubeletConfiguration struct {
 	// Default: "/etc/resolv.conf"
 	// +optional
 	ResolverConfig string `json:"resolvConf,omitempty"`
+	// RunOnce causes the Kubelet to check the API server once for pods,
+	// run those in addition to the pods specified by static pod files, and exit.
+	// Default: false
+	// +optional
+	RunOnce bool `json:"runOnce,omitempty"`
 	// cpuCFSQuota enables CPU CFS quota enforcement for containers that
 	// specify CPU limits.
 	// Dynamic Kubelet Config (beta): If dynamically updating this field, consider that