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Merge pull request #9491 from johngmyers/nodeport-dns 

Default ClusterDNS appropriately when NodeLocalDNS is enabled
This commit is contained in:
Kubernetes Prow Robot 2020-07-05 22:28:50 -07:00 committed by GitHub
parent 61cb11be1b 004f7b578f
commit a97fc42666
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3 changed files with 12 additions and 17 deletions
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12
docs/cluster_spec.md
View File

@ -583,7 +583,7 @@ spec:
## Node local DNS cache
As of kops 1.18, you can enable NodeLocal DNSCache if you are using CoreDNS. It is used to improve improve the Cluster DNS performance by running a dns caching agent on cluster nodes as a DaemonSet.
As of kops 1.18, you can enable NodeLocal DNSCache if you are using CoreDNS. It is used to improve the Cluster DNS performance by running a dns caching agent on cluster nodes as a DaemonSet.
```yaml
spec:
@ -593,16 +593,6 @@ spec:
enabled: true
```
If you are using kube-proxy in ipvs mode or Cilium as CNI, you have to set the nodeLocalDNS as ClusterDNS.
```yaml
spec:
kubelet:
clusterDNS: 169.254.20.10
masterKubelet:
clusterDNS: 169.254.20.10
```
## kubeControllerManager
This block contains configurations for the `controller-manager`.

4
pkg/apis/kops/validation/validation.go
View File

@ -1096,11 +1096,11 @@ func validateNodeLocalDNS(spec *kops.ClusterSpec, fldpath *field.Path) field.Err
}
if (spec.KubeProxy != nil && spec.KubeProxy.ProxyMode == "ipvs") || (spec.Networking != nil && spec.Networking.Cilium != nil) {
if spec.Kubelet != nil && spec.Kubelet.ClusterDNS != spec.KubeDNS.NodeLocalDNS.LocalIP {
if spec.Kubelet != nil && spec.Kubelet.ClusterDNS != "" && spec.Kubelet.ClusterDNS != spec.KubeDNS.NodeLocalDNS.LocalIP {
allErrs = append(allErrs, field.Forbidden(fldpath.Child("kubelet", "clusterDNS"), "Kubelet ClusterDNS must be set to the default IP address for LocalIP"))
}
if spec.MasterKubelet != nil && spec.MasterKubelet.ClusterDNS != spec.KubeDNS.NodeLocalDNS.LocalIP {
if spec.MasterKubelet != nil && spec.MasterKubelet.ClusterDNS != "" && spec.MasterKubelet.ClusterDNS != spec.KubeDNS.NodeLocalDNS.LocalIP {
allErrs = append(allErrs, field.Forbidden(fldpath.Child("kubelet", "clusterDNS"), "MasterKubelet ClusterDNS must be set to the default IP address for LocalIP"))
}
}

13
pkg/model/components/kubelet.go
View File

@ -82,11 +82,16 @@ func (b *KubeletOptionsBuilder) BuildOptions(o interface{}) error {
}
if clusterSpec.Kubelet.ClusterDNS == "" {
ip, err := WellKnownServiceIP(clusterSpec, 10)
if err != nil {
return err
if clusterSpec.KubeDNS != nil && clusterSpec.KubeDNS.NodeLocalDNS != nil && fi.BoolValue(clusterSpec.KubeDNS.NodeLocalDNS.Enabled) &&
((clusterSpec.KubeProxy != nil && clusterSpec.KubeProxy.ProxyMode == "ipvs") || (clusterSpec.Networking != nil && clusterSpec.Networking.Cilium != nil)) {
clusterSpec.Kubelet.ClusterDNS = clusterSpec.KubeDNS.NodeLocalDNS.LocalIP
} else {
ip, err := WellKnownServiceIP(clusterSpec, 10)
if err != nil {
return err
}
clusterSpec.Kubelet.ClusterDNS = ip.String()
}
clusterSpec.Kubelet.ClusterDNS = ip.String()
}
clusterSpec.MasterKubelet.RegisterSchedulable = fi.Bool(false)