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defaults.go
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defaults.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 v1
import (
"k8s.io/kubernetes/pkg/runtime"
"strings"
sccutil "k8s.io/kubernetes/pkg/securitycontextconstraints/util"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/intstr"
"k8s.io/kubernetes/pkg/util/parsers"
"k8s.io/kubernetes/pkg/util/sets"
)
func addDefaultingFuncs(scheme *runtime.Scheme) {
scheme.AddDefaultingFuncs(
func(obj *PodExecOptions) {
obj.Stdout = true
obj.Stderr = true
},
func(obj *PodAttachOptions) {
obj.Stdout = true
obj.Stderr = true
},
func(obj *ReplicationController) {
var labels map[string]string
if obj.Spec.Template != nil {
labels = obj.Spec.Template.Labels
}
// TODO: support templates defined elsewhere when we support them in the API
if labels != nil {
if len(obj.Spec.Selector) == 0 {
obj.Spec.Selector = labels
}
if len(obj.Labels) == 0 {
obj.Labels = labels
}
}
if obj.Spec.Replicas == nil {
obj.Spec.Replicas = new(int32)
*obj.Spec.Replicas = 1
}
},
func(obj *Volume) {
if util.AllPtrFieldsNil(&obj.VolumeSource) {
obj.VolumeSource = VolumeSource{
EmptyDir: &EmptyDirVolumeSource{},
}
}
},
func(obj *ContainerPort) {
if obj.Protocol == "" {
obj.Protocol = ProtocolTCP
}
// Carry conversion to make port case valid
switch strings.ToUpper(string(obj.Protocol)) {
case string(ProtocolTCP):
obj.Protocol = ProtocolTCP
case string(ProtocolUDP):
obj.Protocol = ProtocolUDP
}
},
func(obj *Container) {
if obj.ImagePullPolicy == "" {
_, tag := parsers.ParseImageName(obj.Image)
// Check image tag
if tag == "latest" {
obj.ImagePullPolicy = PullAlways
} else {
obj.ImagePullPolicy = PullIfNotPresent
}
}
if obj.TerminationMessagePath == "" {
obj.TerminationMessagePath = TerminationMessagePathDefault
}
},
func(obj *ServiceSpec) {
if obj.SessionAffinity == "" {
obj.SessionAffinity = ServiceAffinityNone
}
if obj.Type == "" {
obj.Type = ServiceTypeClusterIP
}
for i := range obj.Ports {
sp := &obj.Ports[i]
if sp.Protocol == "" {
sp.Protocol = ProtocolTCP
}
if sp.TargetPort == intstr.FromInt(0) || sp.TargetPort == intstr.FromString("") {
sp.TargetPort = intstr.FromInt(int(sp.Port))
}
}
// Carry conversion
if len(obj.ClusterIP) == 0 && len(obj.DeprecatedPortalIP) > 0 {
obj.ClusterIP = obj.DeprecatedPortalIP
}
},
func(obj *ServicePort) {
// Carry conversion to make port case valid
switch strings.ToUpper(string(obj.Protocol)) {
case string(ProtocolTCP):
obj.Protocol = ProtocolTCP
case string(ProtocolUDP):
obj.Protocol = ProtocolUDP
}
},
func(obj *Pod) {
// If limits are specified, but requests are not, default requests to limits
// This is done here rather than a more specific defaulting pass on ResourceRequirements
// because we only want this defaulting semantic to take place on a Pod and not a PodTemplate
for i := range obj.Spec.Containers {
// set requests to limits if requests are not specified, but limits are
if obj.Spec.Containers[i].Resources.Limits != nil {
if obj.Spec.Containers[i].Resources.Requests == nil {
obj.Spec.Containers[i].Resources.Requests = make(ResourceList)
}
for key, value := range obj.Spec.Containers[i].Resources.Limits {
if _, exists := obj.Spec.Containers[i].Resources.Requests[key]; !exists {
obj.Spec.Containers[i].Resources.Requests[key] = *(value.Copy())
}
}
}
}
},
func(obj *PodSpec) {
if obj.DNSPolicy == "" {
obj.DNSPolicy = DNSClusterFirst
}
if obj.RestartPolicy == "" {
obj.RestartPolicy = RestartPolicyAlways
}
if obj.HostNetwork {
defaultHostNetworkPorts(&obj.Containers)
}
if obj.SecurityContext == nil {
obj.SecurityContext = &PodSecurityContext{}
}
// Carry migration from serviceAccount to serviceAccountName
if len(obj.ServiceAccountName) == 0 && len(obj.DeprecatedServiceAccount) > 0 {
obj.ServiceAccountName = obj.DeprecatedServiceAccount
}
// Carry migration from host to nodeName
if len(obj.NodeName) == 0 && len(obj.DeprecatedHost) > 0 {
obj.NodeName = obj.DeprecatedHost
}
if obj.TerminationGracePeriodSeconds == nil {
period := int64(DefaultTerminationGracePeriodSeconds)
obj.TerminationGracePeriodSeconds = &period
}
},
func(obj *Probe) {
if obj.TimeoutSeconds == 0 {
obj.TimeoutSeconds = 1
}
if obj.PeriodSeconds == 0 {
obj.PeriodSeconds = 10
}
if obj.SuccessThreshold == 0 {
obj.SuccessThreshold = 1
}
if obj.FailureThreshold == 0 {
obj.FailureThreshold = 3
}
},
func(obj *Secret) {
if obj.Type == "" {
obj.Type = SecretTypeOpaque
}
},
func(obj *PersistentVolume) {
if obj.Status.Phase == "" {
obj.Status.Phase = VolumePending
}
if obj.Spec.PersistentVolumeReclaimPolicy == "" {
obj.Spec.PersistentVolumeReclaimPolicy = PersistentVolumeReclaimRetain
}
},
func(obj *PersistentVolumeClaim) {
if obj.Status.Phase == "" {
obj.Status.Phase = ClaimPending
}
},
func(obj *ISCSIVolumeSource) {
if obj.ISCSIInterface == "" {
obj.ISCSIInterface = "default"
}
},
func(obj *Endpoints) {
for i := range obj.Subsets {
ss := &obj.Subsets[i]
for i := range ss.Ports {
ep := &ss.Ports[i]
if ep.Protocol == "" {
ep.Protocol = ProtocolTCP
}
}
}
},
func(obj *EndpointPort) {
// Carry conversion to make port case valid
switch strings.ToUpper(string(obj.Protocol)) {
case string(ProtocolTCP):
obj.Protocol = ProtocolTCP
case string(ProtocolUDP):
obj.Protocol = ProtocolUDP
}
},
func(obj *HTTPGetAction) {
if obj.Path == "" {
obj.Path = "/"
}
if obj.Scheme == "" {
obj.Scheme = URISchemeHTTP
}
},
func(obj *NamespaceStatus) {
if obj.Phase == "" {
obj.Phase = NamespaceActive
}
},
func(obj *Node) {
if obj.Spec.ExternalID == "" {
obj.Spec.ExternalID = obj.Name
}
},
func(obj *NodeStatus) {
if obj.Allocatable == nil && obj.Capacity != nil {
obj.Allocatable = make(ResourceList, len(obj.Capacity))
for key, value := range obj.Capacity {
obj.Allocatable[key] = *(value.Copy())
}
obj.Allocatable = obj.Capacity
}
},
func(obj *ObjectFieldSelector) {
if obj.APIVersion == "" {
obj.APIVersion = "v1"
}
},
func(obj *LimitRangeItem) {
// for container limits, we apply default values
if obj.Type == LimitTypeContainer {
if obj.Default == nil {
obj.Default = make(ResourceList)
}
if obj.DefaultRequest == nil {
obj.DefaultRequest = make(ResourceList)
}
// If a default limit is unspecified, but the max is specified, default the limit to the max
for key, value := range obj.Max {
if _, exists := obj.Default[key]; !exists {
obj.Default[key] = *(value.Copy())
}
}
// If a default limit is specified, but the default request is not, default request to limit
for key, value := range obj.Default {
if _, exists := obj.DefaultRequest[key]; !exists {
obj.DefaultRequest[key] = *(value.Copy())
}
}
// If a default request is not specified, but the min is provided, default request to the min
for key, value := range obj.Min {
if _, exists := obj.DefaultRequest[key]; !exists {
obj.DefaultRequest[key] = *(value.Copy())
}
}
}
},
func(obj *ConfigMap) {
if obj.Data == nil {
obj.Data = make(map[string]string)
}
},
func(obj *SecurityContextConstraints) {
defaultSecurityContextConstraints(obj)
},
)
}
// With host networking default all container ports to host ports.
func defaultHostNetworkPorts(containers *[]Container) {
for i := range *containers {
for j := range (*containers)[i].Ports {
if (*containers)[i].Ports[j].HostPort == 0 {
(*containers)[i].Ports[j].HostPort = (*containers)[i].Ports[j].ContainerPort
}
}
}
}
// Default SCCs for new fields. FSGroup and SupplementalGroups are
// set to the RunAsAny strategy if they are unset on the scc.
func defaultSecurityContextConstraints(scc *SecurityContextConstraints) {
if len(scc.FSGroup.Type) == 0 {
scc.FSGroup.Type = FSGroupStrategyRunAsAny
}
if len(scc.SupplementalGroups.Type) == 0 {
scc.SupplementalGroups.Type = SupplementalGroupsStrategyRunAsAny
}
// defaults the volume slice of the SCC.
// In order to support old clients the boolean fields will always take precedence.
defaultAllowedVolumes := fsTypeToStringSet(scc.Volumes)
// assume a nil volume slice is allowing everything for backwards compatibility
if defaultAllowedVolumes == nil {
defaultAllowedVolumes = sets.NewString(string(FSTypeAll))
}
if scc.AllowHostDirVolumePlugin {
// if already allowing all then there is no reason to add
if !defaultAllowedVolumes.Has(string(FSTypeAll)) {
defaultAllowedVolumes.Insert(string(FSTypeHostPath))
}
} else {
// we should only default all volumes if the SCC came in with FSTypeAll or we defaulted it
// otherwise we should only change the volumes slice to ensure that it does not conflict with
// the AllowHostDirVolumePlugin setting
shouldDefaultAllVolumes := defaultAllowedVolumes.Has(string(FSTypeAll))
// remove anything from volumes that conflicts with AllowHostDirVolumePlugin = false
defaultAllowedVolumes.Delete(string(FSTypeAll))
defaultAllowedVolumes.Delete(string(FSTypeHostPath))
if shouldDefaultAllVolumes {
allVolumes := sccutil.GetAllFSTypesExcept(string(FSTypeHostPath))
defaultAllowedVolumes.Insert(allVolumes.List()...)
}
}
scc.Volumes = StringSetToFSType(defaultAllowedVolumes)
}
func StringSetToFSType(set sets.String) []FSType {
if set == nil {
return nil
}
volumes := []FSType{}
for _, v := range set.List() {
volumes = append(volumes, FSType(v))
}
return volumes
}
func fsTypeToStringSet(volumes []FSType) sets.String {
if volumes == nil {
return nil
}
set := sets.NewString()
for _, v := range volumes {
set.Insert(string(v))
}
return set
}