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Added ability for Docker containers to set usage of dns settings along with hostNetwork is true

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Introduced chages:
   1. Re-writing of the resolv.conf file generated by docker.
      Cluster dns settings aren't passed anymore to docker api in all cases, not only for pods with host network:
      the resolver conf will be overwritten after infra-container creation to override docker's behaviour.

   2. Added new one dnsPolicy - 'ClusterFirstWithHostNet', so now there are:
      - ClusterFirstWithHostNet - use dns settings in all cases, i.e. with hostNet=true as well
      - ClusterFirst - use dns settings unless hostNetwork is true
      - Default

Fixes #17406
This commit is contained in:
vefimova
2016-08-05 03:19:17 -05:00
parent c7b53794d0
commit fc8a37ec86
31 changed files with 146 additions and 80 deletions
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9
staging/src/k8s.io/client-go/pkg/api/types.go
View File

@@ -1679,9 +1679,14 @@ type PodList struct {
type DNSPolicy string
const (
// DNSClusterFirstWithHostNet indicates that the pod should use cluster DNS
// first, if it is available, then fall back on the default
// (as determined by kubelet) DNS settings.
DNSClusterFirstWithHostNet DNSPolicy = "ClusterFirstWithHostNet"
// DNSClusterFirst indicates that the pod should use cluster DNS
// first, if it is available, then fall back on the default (as
// determined by kubelet) DNS settings.
// first unless hostNetwork is true, if it is available, then
// fall back on the default (as determined by kubelet) DNS settings.
DNSClusterFirst DNSPolicy = "ClusterFirst"
// DNSDefault indicates that the pod should use the default (as

3
staging/src/k8s.io/client-go/pkg/api/v1/generated.proto
View File

@@ -2607,8 +2607,9 @@ message PodSpec {
optional int64 activeDeadlineSeconds = 5;
// Set DNS policy for containers within the pod.
// One of 'ClusterFirst' or 'Default'.
// One of 'ClusterFirstWithHostNet', 'ClusterFirst' or 'Default'.
// Defaults to "ClusterFirst".
// To have DNS options set along with hostNetwork, you have to specify DNS policy explicitly to 'ClusterFirstWithHostNet'.
// +optional
optional string dnsPolicy = 6;

12
staging/src/k8s.io/client-go/pkg/api/v1/types.go
View File

@@ -1888,9 +1888,14 @@ const (
type DNSPolicy string
const (
// DNSClusterFirstWithHostNet indicates that the pod should use cluster DNS
// first, if it is available, then fall back on the default
// (as determined by kubelet) DNS settings.
DNSClusterFirstWithHostNet DNSPolicy = "ClusterFirstWithHostNet"
// DNSClusterFirst indicates that the pod should use cluster DNS
// first, if it is available, then fall back on the default (as
// determined by kubelet) DNS settings.
// first unless hostNetwork is true, if it is available, then
// fall back on the default (as determined by kubelet) DNS settings.
DNSClusterFirst DNSPolicy = "ClusterFirst"
// DNSDefault indicates that the pod should use the default (as
@@ -2245,8 +2250,9 @@ type PodSpec struct {
// +optional
ActiveDeadlineSeconds *int64 `json:"activeDeadlineSeconds,omitempty" protobuf:"varint,5,opt,name=activeDeadlineSeconds"`
// Set DNS policy for containers within the pod.
// One of 'ClusterFirst' or 'Default'.
// One of 'ClusterFirstWithHostNet', 'ClusterFirst' or 'Default'.
// Defaults to "ClusterFirst".
// To have DNS options set along with hostNetwork, you have to specify DNS policy explicitly to 'ClusterFirstWithHostNet'.
// +optional
DNSPolicy DNSPolicy `json:"dnsPolicy,omitempty" protobuf:"bytes,6,opt,name=dnsPolicy,casttype=DNSPolicy"`
// NodeSelector is a selector which must be true for the pod to fit on a node.

2
staging/src/k8s.io/client-go/pkg/api/v1/types_swagger_doc_generated.go
View File

@@ -1321,7 +1321,7 @@ var map_PodSpec = map[string]string{
"restartPolicy": "Restart policy for all containers within the pod. One of Always, OnFailure, Never. Default to Always. More info: http://kubernetes.io/docs/user-guide/pod-states#restartpolicy",
"terminationGracePeriodSeconds": "Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request. Value must be non-negative integer. The value zero indicates delete immediately. If this value is nil, the default grace period will be used instead. The grace period is the duration in seconds after the processes running in the pod are sent a termination signal and the time when the processes are forcibly halted with a kill signal. Set this value longer than the expected cleanup time for your process. Defaults to 30 seconds.",
"activeDeadlineSeconds": "Optional duration in seconds the pod may be active on the node relative to StartTime before the system will actively try to mark it failed and kill associated containers. Value must be a positive integer.",
"dnsPolicy": "Set DNS policy for containers within the pod. One of 'ClusterFirst' or 'Default'. Defaults to \"ClusterFirst\".",
"dnsPolicy": "Set DNS policy for containers within the pod. One of 'ClusterFirstWithHostNet', 'ClusterFirst' or 'Default'. Defaults to \"ClusterFirst\". To have DNS options set along with hostNetwork, you have to specify DNS policy explicitly to 'ClusterFirstWithHostNet'.",
"nodeSelector": "NodeSelector is a selector which must be true for the pod to fit on a node. Selector which must match a node's labels for the pod to be scheduled on that node. More info: http://kubernetes.io/docs/user-guide/node-selection/README",
"serviceAccountName": "ServiceAccountName is the name of the ServiceAccount to use to run this pod. More info: http://releases.k8s.io/HEAD/docs/design/service_accounts.md",
"serviceAccount": "DeprecatedServiceAccount is a depreciated alias for ServiceAccountName. Deprecated: Use serviceAccountName instead.",