Problem: CoreDNS getting preempted by other pods

Solution: Set priorityClassName to system-node-critical of traefik, metrics-server, local storage and coredns deployment
Signed-off-by: transhapHigsn <fet.prashantsingh@gmail.com>

manifests/coredns.yaml

@@ -95,6 +95,7 @@ spec:
       labels:
         k8s-app: kube-dns
     spec:
+      priorityClassName: "system-cluster-critical"
       serviceAccountName: coredns
       tolerations:
         - key: "CriticalAddonsOnly"

manifests/local-storage.yaml

@@ -50,6 +50,7 @@ spec:
       labels:
         app: local-path-provisioner
     spec:
+      priorityClassName: "system-node-critical"
       serviceAccountName: local-path-provisioner-service-account
       tolerations:
           - key: "CriticalAddonsOnly"

manifests/metrics-server/metrics-server-deployment.yaml

@@ -22,6 +22,7 @@ spec:
       labels:
         k8s-app: metrics-server
     spec:
+      priorityClassName: "system-node-critical"
       serviceAccountName: metrics-server
       tolerations:
         - key: "CriticalAddonsOnly"

manifests/traefik.yaml

@@ -16,6 +16,7 @@ spec:
     kubernetes:
       ingressEndpoint:
         useDefaultPublishedService: true
+    priorityClassName: "system-cluster-critical"
     image: "rancher/library-traefik"
     tolerations:
       - key: "CriticalAddonsOnly"