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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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4
pkg/kubelet/container/helpers.go
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@@ -49,8 +49,8 @@ type HandlerRunner interface {
// RuntimeHelper wraps kubelet to make container runtime
// able to get necessary informations like the RunContainerOptions, DNS settings.
type RuntimeHelper interface {
GenerateRunContainerOptions(pod *v1.Pod, container *v1.Container, podIP string) (*RunContainerOptions, error)
GetClusterDNS(pod *v1.Pod) (dnsServers []string, dnsSearches []string, err error)
GenerateRunContainerOptions(pod *v1.Pod, container *v1.Container, podIP string) (contOpts *RunContainerOptions, useClusterFirstPolicy bool, err error)
GetClusterDNS(pod *v1.Pod) (dnsServers []string, dnsSearches []string, useClusterFirstPolicy bool, err error)
// GetPodCgroupParent returns the the CgroupName identifer, and its literal cgroupfs form on the host
// of a pod.
GetPodCgroupParent(pod *v1.Pod) (cm.CgroupName, string)