K8S DNSConfig not apply to the pod
Describe the bug When we deploy a windows container with DNSConfig parameter, this parameter is not apply to the container.
To Reproduce
- Deploy custom coreDNS pod
- Deploy Pod with DNSconfig which point to this coreDNS service
Expected behavior POD DNS should be setup with the information which come from DNSConfig
Configuration:
- Edition: Windows Server]
- Base Image being used: tested on Windows Server Core 2022 and Windows server nano 2022
- Container engine: K8S - ctr
- Container Engine version K8S (on EKS) 1.30
Additional context
The same dnsConfig setting work normally on Linux pod.
Pod manifest
---
apiVersion: v1
kind: Pod
metadata:
name: powershell-debug
spec:
containers:
- name: powershell
# image: mcr.microsoft.com/powershell:lts-7.2-nanoserver-ltsc2022
image: mcr.microsoft.com/windows/servercore:ltsc2022
# command: ["pwsh"]
command: ["powershell.exe"]
args: ["-c", "ping", "-t", "localhost"]
dnsConfig:
nameservers:
- 172.20.159.24
options:
- name: ndots
value: "5"
searches:
- svc.cluster.local
- cluster.local
dnsPolicy: None
nodeSelector:
kubernetes.io/os: windows
kubernetes.io/arch: amd64
tolerations:
- effect: NoSchedule
key: os
operator: Equal
value: windows
- effect: NoExecute
key: os
operator: Equal
value: windows
From the pod :
PS C:\> Get-DnsClientServerAddress
InterfaceAlias Interface Address ServerAddresses
Index Family
-------------- --------- ------- ---------------
vEthernet (cid-b20de771-e... 39 IPv4 {172.20.0.10} <== Default corsDNS, not the custom one define into the config
vEthernet (cid-b20de771-e... 39 IPv6 {}
Loopback Pseudo-Interface 6 38 IPv4 {}
Loopback Pseudo-Interface 6 38 IPv6 {}
Resolve-DnsName -name svcname.svc.cluster.local
Resolve-DnsName : svcname.svc.cluster.local : DNS name does not exist
At line:1 char:1
+ Resolve-DnsName -name svcname.svc.c ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ResourceUnavailable: (svcname...c.cluster.local:String) [Resolve-DnsName], Win32Exception
+ FullyQualifiedErrorId : DNS_ERROR_RCODE_NAME_ERROR,Microsoft.DnsClient.Commands.ResolveDnsName
Resolve-DnsName -name svcname.svc.cluster.local -Server 172.20.159.24
Name Type TTL Section IPAddress
---- ---- --- ------- ---------
svcname.svc. A 5 Answer 172.20.111.200
cluster.local
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This issue has been open for 30 days with no updates. no assignees, please provide an update or close this issue.
This issue has been open for 30 days with no updates. no assignees, please provide an update or close this issue.
This issue has been open for 30 days with no updates. no assignees, please provide an update or close this issue.