bootstrap

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• Variables

Variables

var (
	MandatoryPriorityLevelConfigurations = []*flowcontrol.PriorityLevelConfiguration{
		MandatoryPriorityLevelConfigurationCatchAll,
		MandatoryPriorityLevelConfigurationExempt,
	}
	MandatoryFlowSchemas = []*flowcontrol.FlowSchema{
		MandatoryFlowSchemaExempt,
		MandatoryFlowSchemaCatchAll,
	}
)

The objects that define an apiserver's initial behavior. The registered defaulting procedures make no changes to these particular objects (this is verified in the unit tests of the internalbootstrap package; it can not be verified in this package because that would require importing k8s.io/kubernetes).

var (
	SuggestedPriorityLevelConfigurations = []*flowcontrol.PriorityLevelConfiguration{

		SuggestedPriorityLevelConfigurationSystem,

		SuggestedPriorityLevelConfigurationNodeHigh,

		SuggestedPriorityLevelConfigurationLeaderElection,

		SuggestedPriorityLevelConfigurationWorkloadHigh,

		SuggestedPriorityLevelConfigurationWorkloadLow,

		SuggestedPriorityLevelConfigurationGlobalDefault,
	}
	SuggestedFlowSchemas = []*flowcontrol.FlowSchema{
		SuggestedFlowSchemaSystemNodes,
		SuggestedFlowSchemaSystemNodeHigh,
		SuggestedFlowSchemaProbes,
		SuggestedFlowSchemaSystemLeaderElection,
		SuggestedFlowSchemaWorkloadLeaderElection,
		SuggestedFlowSchemaKubeControllerManager,
		SuggestedFlowSchemaKubeScheduler,
		SuggestedFlowSchemaKubeSystemServiceAccounts,
		SuggestedFlowSchemaServiceAccounts,
		SuggestedFlowSchemaGlobalDefault,
	}
)

The objects that define the current suggested additional configuration

var (
	MandatoryPriorityLevelConfigurationExempt = newPriorityLevelConfiguration(
		flowcontrol.PriorityLevelConfigurationNameExempt,
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementExempt,
		},
	)
	MandatoryPriorityLevelConfigurationCatchAll = newPriorityLevelConfiguration(
		flowcontrol.PriorityLevelConfigurationNameCatchAll,
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 5,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeReject,
				},
			},
		})
)

Mandatory PriorityLevelConfiguration objects

var (
	// "exempt" priority-level is used for preventing priority inversion and ensuring that sysadmin
	// requests are always possible.
	MandatoryFlowSchemaExempt = newFlowSchema(
		"exempt",
		flowcontrol.PriorityLevelConfigurationNameExempt,
		1,
		"",
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.SystemPrivilegedGroup),
			ResourceRules: []flowcontrol.ResourcePolicyRule{
				resourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.APIGroupAll},
					[]string{flowcontrol.ResourceAll},
					[]string{flowcontrol.NamespaceEvery},
					true,
				),
			},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll},
				),
			},
		},
	)
	// "catch-all" priority-level only gets a minimal positive share of concurrency and won't be reaching
	// ideally unless you intentionally deleted the suggested "global-default".
	MandatoryFlowSchemaCatchAll = newFlowSchema(
		flowcontrol.FlowSchemaNameCatchAll,
		flowcontrol.PriorityLevelConfigurationNameCatchAll,
		10000,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.AllUnauthenticated, user.AllAuthenticated),
			ResourceRules: []flowcontrol.ResourcePolicyRule{
				resourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.APIGroupAll},
					[]string{flowcontrol.ResourceAll},
					[]string{flowcontrol.NamespaceEvery},
					true,
				),
			},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll},
				),
			},
		},
	)
)

Mandatory FlowSchema objects

var (
	// system priority-level
	SuggestedPriorityLevelConfigurationSystem = newPriorityLevelConfiguration(
		"system",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 30,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           64,
						HandSize:         6,
						QueueLengthLimit: 50,
					},
				},
			},
		})
	SuggestedPriorityLevelConfigurationNodeHigh = newPriorityLevelConfiguration(
		"node-high",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 40,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           64,
						HandSize:         6,
						QueueLengthLimit: 50,
					},
				},
			},
		})
	// leader-election priority-level
	SuggestedPriorityLevelConfigurationLeaderElection = newPriorityLevelConfiguration(
		"leader-election",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 10,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           16,
						HandSize:         4,
						QueueLengthLimit: 50,
					},
				},
			},
		})
	// workload-high priority-level
	SuggestedPriorityLevelConfigurationWorkloadHigh = newPriorityLevelConfiguration(
		"workload-high",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 40,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           128,
						HandSize:         6,
						QueueLengthLimit: 50,
					},
				},
			},
		})
	// workload-low priority-level
	SuggestedPriorityLevelConfigurationWorkloadLow = newPriorityLevelConfiguration(
		"workload-low",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 100,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           128,
						HandSize:         6,
						QueueLengthLimit: 50,
					},
				},
			},
		})
	// global-default priority-level
	SuggestedPriorityLevelConfigurationGlobalDefault = newPriorityLevelConfiguration(
		"global-default",
		flowcontrol.PriorityLevelConfigurationSpec{
			Type: flowcontrol.PriorityLevelEnablementLimited,
			Limited: &flowcontrol.LimitedPriorityLevelConfiguration{
				AssuredConcurrencyShares: 20,
				LimitResponse: flowcontrol.LimitResponse{
					Type: flowcontrol.LimitResponseTypeQueue,
					Queuing: &flowcontrol.QueuingConfiguration{
						Queues:           128,
						HandSize:         6,
						QueueLengthLimit: 50,
					},
				},
			},
		})
)

Suggested PriorityLevelConfiguration objects

var (
	SuggestedFlowSchemaSystemNodes = newFlowSchema(
		"system-nodes", "system", 500,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.NodesGroup),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	SuggestedFlowSchemaSystemNodeHigh = newFlowSchema(
		"system-node-high", "node-high", 400,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.NodesGroup),
			ResourceRules: []flowcontrol.ResourcePolicyRule{
				resourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{corev1.GroupName},
					[]string{"nodes", "nodes/status"},
					[]string{flowcontrol.NamespaceEvery},
					true),
				resourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{coordinationv1.GroupName},
					[]string{"leases"},
					[]string{flowcontrol.NamespaceEvery},
					false),
			},
		},
	)
	SuggestedFlowSchemaSystemLeaderElection = newFlowSchema(
		"system-leader-election", "leader-election", 100,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: append(
				users(user.KubeControllerManager, user.KubeScheduler),
				kubeSystemServiceAccount(flowcontrol.NameAll)...),
			ResourceRules: []flowcontrol.ResourcePolicyRule{
				resourceRule(
					[]string{"get", "create", "update"},
					[]string{corev1.GroupName},
					[]string{"endpoints", "configmaps"},
					[]string{"kube-system"},
					false),
				resourceRule(
					[]string{"get", "create", "update"},
					[]string{coordinationv1.GroupName},
					[]string{"leases"},
					[]string{flowcontrol.NamespaceEvery},
					false),
			},
		},
	)
	SuggestedFlowSchemaWorkloadLeaderElection = newFlowSchema(
		"workload-leader-election", "leader-election", 200,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: kubeSystemServiceAccount(flowcontrol.NameAll),
			ResourceRules: []flowcontrol.ResourcePolicyRule{
				resourceRule(
					[]string{"get", "create", "update"},
					[]string{corev1.GroupName},
					[]string{"endpoints", "configmaps"},
					[]string{flowcontrol.NamespaceEvery},
					false),
				resourceRule(
					[]string{"get", "create", "update"},
					[]string{coordinationv1.GroupName},
					[]string{"leases"},
					[]string{flowcontrol.NamespaceEvery},
					false),
			},
		},
	)
	SuggestedFlowSchemaKubeControllerManager = newFlowSchema(
		"kube-controller-manager", "workload-high", 800,
		flowcontrol.FlowDistinguisherMethodByNamespaceType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: users(user.KubeControllerManager),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	SuggestedFlowSchemaKubeScheduler = newFlowSchema(
		"kube-scheduler", "workload-high", 800,
		flowcontrol.FlowDistinguisherMethodByNamespaceType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: users(user.KubeScheduler),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	SuggestedFlowSchemaKubeSystemServiceAccounts = newFlowSchema(
		"kube-system-service-accounts", "workload-high", 900,
		flowcontrol.FlowDistinguisherMethodByNamespaceType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: kubeSystemServiceAccount(flowcontrol.NameAll),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	SuggestedFlowSchemaServiceAccounts = newFlowSchema(
		"service-accounts", "workload-low", 9000,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(serviceaccount.AllServiceAccountsGroup),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	SuggestedFlowSchemaGlobalDefault = newFlowSchema(
		"global-default", "global-default", 9900,
		flowcontrol.FlowDistinguisherMethodByUserType,
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.AllUnauthenticated, user.AllAuthenticated),
			ResourceRules: []flowcontrol.ResourcePolicyRule{resourceRule(
				[]string{flowcontrol.VerbAll},
				[]string{flowcontrol.APIGroupAll},
				[]string{flowcontrol.ResourceAll},
				[]string{flowcontrol.NamespaceEvery},
				true)},
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{flowcontrol.VerbAll},
					[]string{flowcontrol.NonResourceAll}),
			},
		},
	)
	// the following flow schema exempts probes
	SuggestedFlowSchemaProbes = newFlowSchema(
		"probes", "exempt", 2,
		"",
		flowcontrol.PolicyRulesWithSubjects{
			Subjects: groups(user.AllUnauthenticated, user.AllAuthenticated),
			NonResourceRules: []flowcontrol.NonResourcePolicyRule{
				nonResourceRule(
					[]string{"get"},
					[]string{"/healthz", "/readyz", "/livez"}),
			},
		},
	)
)

Suggested FlowSchema objects