From 85c851f5198bca4917d6ad08fe1cec9d7d36945b Mon Sep 17 00:00:00 2001
From: Matthew Mosesohn <matthew.mosesohn@gmail.com>
Date: Mon, 18 Nov 2019 11:13:41 +0300
Subject: [PATCH] scale down coredns on each master during graceful upgrade
 (#5344)

This fixes the scenario where masters are upgraded one at a time
and coredns gets improperly scaled back up to 2 replicas.

Change-Id: I7cc9283f40efcfd61b5813c89a5805c95d901567
---
 roles/kubernetes/master/tasks/kubeadm-upgrade.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/roles/kubernetes/master/tasks/kubeadm-upgrade.yml b/roles/kubernetes/master/tasks/kubeadm-upgrade.yml
index ec9b8cf0d..d8a80cd02 100644
--- a/roles/kubernetes/master/tasks/kubeadm-upgrade.yml
+++ b/roles/kubernetes/master/tasks/kubeadm-upgrade.yml
@@ -49,8 +49,8 @@
   retries: 6
   delay: 5
   until: scale_down_coredns is succeeded
+  run_once: yes
   when:
-    - inventory_hostname == groups['kube-master']|first
     - kubeadm_scale_down_coredns_enabled
     - dns_mode not in ['coredns', 'coredns_dual']
   changed_when: false