Merge pull request #60642 from rajansandeep/removepodaffinity

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Reverting the anti-affinity from CoreDNS pods

**What this PR does / why we need it**:
Following #54164 and #59357, removing the anti-affinity from CoreDNS.
 
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

cluster/addons/dns/coredns.yaml.base

@@ -58,9 +58,9 @@ data:
     .:53 {
         errors
         health
-        kubernetes __PILLAR__DNS__DOMAIN__ __PILLAR__CLUSTER_CIDR__ {
+        kubernetes __PILLAR__DNS__DOMAIN__ in-addr.arpa ip6.arpa {
             pods insecure
-            upstream /etc/resolv.conf
+            upstream
             fallthrough in-addr.arpa ip6.arpa
         }
         prometheus :9153
@@ -98,21 +98,9 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
-      affinity:
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-          - weight: 100
-            podAffinityTerm:
-              labelSelector:
-                matchExpressions:
-                - key: k8s-app
-                  operator: In
-                  values:
-                  - coredns
-                topologyKey: kubernetes.io/hostname
       containers:
       - name: coredns
-        image: coredns/coredns:1.0.4
+        image: coredns/coredns:1.0.6
         imagePullPolicy: IfNotPresent
         resources:
           limits:

cluster/addons/dns/coredns.yaml.in

@@ -58,9 +58,9 @@ data:
     .:53 {
         errors
         health
-        kubernetes {{ pillar['dns_domain'] }} {{ pillar['service_cluster_ip_range'] }} {
+        kubernetes {{ pillar['dns_domain'] }} in-addr.arpa ip6.arpa {
             pods insecure
-            upstream /etc/resolv.conf
+            upstream
             fallthrough in-addr.arpa ip6.arpa
         }
         prometheus :9153
@@ -98,21 +98,9 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
-      affinity:
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-          - weight: 100
-            podAffinityTerm:
-              labelSelector:
-                matchExpressions:
-                - key: k8s-app
-                  operator: In
-                  values:
-                  - coredns
-                topologyKey: kubernetes.io/hostname
       containers:
       - name: coredns
-        image: coredns/coredns:1.0.4
+        image: coredns/coredns:1.0.6
         imagePullPolicy: IfNotPresent
         resources:
           limits:

cluster/addons/dns/coredns.yaml.sed

@@ -58,9 +58,9 @@ data:
     .:53 {
         errors
         health
-        kubernetes $DNS_DOMAIN $SERVICE_CLUSTER_IP_RANGE {
+        kubernetes $DNS_DOMAIN in-addr.arpa ip6.arpa {
             pods insecure
-            upstream /etc/resolv.conf
+            upstream
             fallthrough in-addr.arpa ip6.arpa
         }
         prometheus :9153
@@ -98,21 +98,9 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
-      affinity:
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-          - weight: 100
-            podAffinityTerm:
-              labelSelector:
-                matchExpressions:
-                - key: k8s-app
-                  operator: In
-                  values:
-                  - coredns
-                topologyKey: kubernetes.io/hostname
       containers:
       - name: coredns
-        image: coredns/coredns:1.0.4
+        image: coredns/coredns:1.0.6
         imagePullPolicy: IfNotPresent
         resources:
           limits:

cmd/kubeadm/app/phases/addons/dns/manifests.go

@@ -243,18 +243,6 @@ spec:
         operator: Exists
       - key: {{ .MasterTaintKey }}
         effect: NoSchedule
-      affinity:
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-          - weight: 100
-            podAffinityTerm:
-              labelSelector:
-                matchExpressions:
-                - key: k8s-app
-                  operator: In
-                  values:
-                  - coredns
-              topologyKey: kubernetes.io/hostname
       containers:
       - name: coredns
         image: coredns/coredns:{{ .Version }}