From 6450b85b835a83e541245f7abb9c7fcc8b991632 Mon Sep 17 00:00:00 2001
From: jwfang <54740235@qq.com>
Date: Tue, 20 Jun 2017 20:06:54 +0800
Subject: [PATCH] make max docker dns server configurable

---
 inventory/group_vars/all.yml         | 4 ++++
 roles/docker/defaults/main.yml       | 2 ++
 roles/docker/tasks/set_facts_dns.yml | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/inventory/group_vars/all.yml b/inventory/group_vars/all.yml
index 6388ca7af..999d554f2 100644
--- a/inventory/group_vars/all.yml
+++ b/inventory/group_vars/all.yml
@@ -83,6 +83,10 @@ bin_dir: /usr/local/bin
 ## Please note that overlay2 is only supported on newer kernels
 #docker_storage_options: -s overlay2
 
+# Maximum name servers for docker. If your host /etc/resolv.conf contains serval
+# nameservers, you may need to increase this.
+#docker_max_dns_servers: 3
+
 ## Default packages to install within the cluster, f.e:
 #kpm_packages:
 #  - name: kube-system/grafana
diff --git a/roles/docker/defaults/main.yml b/roles/docker/defaults/main.yml
index c771953ff..ca88fa1f1 100644
--- a/roles/docker/defaults/main.yml
+++ b/roles/docker/defaults/main.yml
@@ -8,3 +8,5 @@ docker_repo_key_info:
 
 docker_repo_info:
   repos:
+
+docker_max_dns_servers: 3
diff --git a/roles/docker/tasks/set_facts_dns.yml b/roles/docker/tasks/set_facts_dns.yml
index f17c1bde2..1823b489b 100644
--- a/roles/docker/tasks/set_facts_dns.yml
+++ b/roles/docker/tasks/set_facts_dns.yml
@@ -53,7 +53,7 @@
 - name: check number of nameservers
   fail:
     msg: "Too many nameservers"
-  when: docker_dns_servers|length > 3
+  when: docker_dns_servers|length > docker_max_dns_servers|int
 
 - name: check number of search domains
   fail: