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default.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package bootstrap
import (
coordinationv1 "k8s.io/api/coordination/v1"
corev1 "k8s.io/api/core/v1"
flowcontrol "k8s.io/api/flowcontrol/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apiserver/pkg/authentication/serviceaccount"
"k8s.io/apiserver/pkg/authentication/user"
)
// 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 (
MandatoryPriorityLevelConfigurations = []*flowcontrol.PriorityLevelConfiguration{
MandatoryPriorityLevelConfigurationCatchAll,
MandatoryPriorityLevelConfigurationExempt,
}
MandatoryFlowSchemas = []*flowcontrol.FlowSchema{
MandatoryFlowSchemaExempt,
MandatoryFlowSchemaCatchAll,
}
)
// The objects that define the current suggested additional configuration
var (
SuggestedPriorityLevelConfigurations = []*flowcontrol.PriorityLevelConfiguration{
// "system" priority-level is for the system components that affects self-maintenance of the
// cluster and the availability of those running pods in the cluster, including kubelet and
// kube-proxy.
SuggestedPriorityLevelConfigurationSystem,
// "leader-election" is dedicated for controllers' leader-election, which majorly affects the
// availability of any controller runs in the cluster.
SuggestedPriorityLevelConfigurationLeaderElection,
// "workload-high" is used by those workloads with higher priority but their failure won't directly
// impact the existing running pods in the cluster, which includes kube-scheduler, and those well-known
// built-in workloads such as "deployments", "replicasets" and other low-level custom workload which
// is important for the cluster.
SuggestedPriorityLevelConfigurationWorkloadHigh,
// "workload-low" is used by those workloads with lower priority which availability only has a
// minor impact on the cluster.
SuggestedPriorityLevelConfigurationWorkloadLow,
// "global-default" serves the rest traffic not handled by the other suggested flow-schemas above.
SuggestedPriorityLevelConfigurationGlobalDefault,
}
SuggestedFlowSchemas = []*flowcontrol.FlowSchema{
SuggestedFlowSchemaSystemNodes, // references "system" priority-level
SuggestedFlowSchemaProbes, // references "exempt" priority-level
SuggestedFlowSchemaSystemLeaderElection, // references "leader-election" priority-level
SuggestedFlowSchemaWorkloadLeaderElection, // references "leader-election" priority-level
SuggestedFlowSchemaKubeControllerManager, // references "workload-high" priority-level
SuggestedFlowSchemaKubeScheduler, // references "workload-high" priority-level
SuggestedFlowSchemaKubeSystemServiceAccounts, // references "workload-high" priority-level
SuggestedFlowSchemaServiceAccounts, // references "workload-low" priority-level
SuggestedFlowSchemaGlobalDefault, // references "global-default" priority-level
}
)
// Mandatory PriorityLevelConfiguration objects
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 FlowSchema 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, // matchingPrecedence
"", // distinguisherMethodType
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, // matchingPrecedence
flowcontrol.FlowDistinguisherMethodByUserType, // distinguisherMethodType
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},
),
},
},
)
)
// Suggested PriorityLevelConfiguration 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,
},
},
},
})
// 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 FlowSchema objects
var (
SuggestedFlowSchemaSystemNodes = newFlowSchema(
"system-nodes", "system", 500,
flowcontrol.FlowDistinguisherMethodByUserType,
flowcontrol.PolicyRulesWithSubjects{
Subjects: groups(user.NodesGroup), // the nodes group
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}),
},
},
)
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,
"", // distinguisherMethodType
flowcontrol.PolicyRulesWithSubjects{
Subjects: groups(user.AllUnauthenticated, user.AllAuthenticated),
NonResourceRules: []flowcontrol.NonResourcePolicyRule{
nonResourceRule(
[]string{"get"},
[]string{"/healthz", "/readyz", "/livez"}),
},
},
)
)
func newPriorityLevelConfiguration(name string, spec flowcontrol.PriorityLevelConfigurationSpec) *flowcontrol.PriorityLevelConfiguration {
return &flowcontrol.PriorityLevelConfiguration{
ObjectMeta: metav1.ObjectMeta{Name: name},
Spec: spec}
}
func newFlowSchema(name, plName string, matchingPrecedence int32, dmType flowcontrol.FlowDistinguisherMethodType, rules ...flowcontrol.PolicyRulesWithSubjects) *flowcontrol.FlowSchema {
var dm *flowcontrol.FlowDistinguisherMethod
if dmType != "" {
dm = &flowcontrol.FlowDistinguisherMethod{Type: dmType}
}
return &flowcontrol.FlowSchema{
ObjectMeta: metav1.ObjectMeta{Name: name},
Spec: flowcontrol.FlowSchemaSpec{
PriorityLevelConfiguration: flowcontrol.PriorityLevelConfigurationReference{
Name: plName,
},
MatchingPrecedence: matchingPrecedence,
DistinguisherMethod: dm,
Rules: rules},
}
}
func groups(names ...string) []flowcontrol.Subject {
ans := make([]flowcontrol.Subject, len(names))
for idx, name := range names {
ans[idx] = flowcontrol.Subject{
Kind: flowcontrol.SubjectKindGroup,
Group: &flowcontrol.GroupSubject{
Name: name,
},
}
}
return ans
}
func users(names ...string) []flowcontrol.Subject {
ans := make([]flowcontrol.Subject, len(names))
for idx, name := range names {
ans[idx] = flowcontrol.Subject{
Kind: flowcontrol.SubjectKindUser,
User: &flowcontrol.UserSubject{
Name: name,
},
}
}
return ans
}
func kubeSystemServiceAccount(names ...string) []flowcontrol.Subject {
subjects := []flowcontrol.Subject{}
for _, name := range names {
subjects = append(subjects, flowcontrol.Subject{
Kind: flowcontrol.SubjectKindServiceAccount,
ServiceAccount: &flowcontrol.ServiceAccountSubject{
Name: name,
Namespace: metav1.NamespaceSystem,
},
})
}
return subjects
}
func resourceRule(verbs []string, groups []string, resources []string, namespaces []string, clusterScoped bool) flowcontrol.ResourcePolicyRule {
return flowcontrol.ResourcePolicyRule{
Verbs: verbs,
APIGroups: groups,
Resources: resources,
Namespaces: namespaces,
ClusterScope: clusterScoped,
}
}
func nonResourceRule(verbs []string, nonResourceURLs []string) flowcontrol.NonResourcePolicyRule {
return flowcontrol.NonResourcePolicyRule{Verbs: verbs, NonResourceURLs: nonResourceURLs}
}