From 299e74512782dbf47a881d18ac16b72c10f8f28c Mon Sep 17 00:00:00 2001
From: SataQiu <shidaqiu2018@gmail.com>
Date: Wed, 15 Jun 2022 12:01:05 +0800
Subject: [PATCH] kubeadm: add the preferred pod anti-affinity for CoreDNS
 Deployment

---
 cmd/kubeadm/app/phases/addons/dns/manifests.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cmd/kubeadm/app/phases/addons/dns/manifests.go b/cmd/kubeadm/app/phases/addons/dns/manifests.go
index 97c7f8b3e60..bb5455a15ff 100644
--- a/cmd/kubeadm/app/phases/addons/dns/manifests.go
+++ b/cmd/kubeadm/app/phases/addons/dns/manifests.go
@@ -78,6 +78,17 @@ spec:
     spec:
       priorityClassName: system-cluster-critical
       serviceAccountName: coredns
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                - key: k8s-app
+                  operator: In
+                  values: ["kube-dns"]
+              topologyKey: kubernetes.io/hostname
       tolerations:
       - key: CriticalAddonsOnly
         operator: Exists