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K8S DNSConfig not apply to the pod #612
Description
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
Activity
github-actions commentedon Sep 6, 2025
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