--- a/roles/nginx/tasks/main.yml	Sun Mar 13 06:23:08 2016 +0000
+++ b/roles/nginx/tasks/main.yml	Sat Jun 25 12:27:03 2016 +0800
@@ -36,7 +36,10 @@
     - restart nginx
 
 - name: Extract information for HPKP header
-  shell: openssl rsa -in /etc/nginx/easy-rsa/keys/{{ item }} -outform der -pubout | openssl dgst -sha256 -binary | openssl enc -base64
+  shell: >
+    openssl rsa -in /etc/nginx/easy-rsa/keys/{{ item }} -outform der -pubout
+    | openssl dgst -sha256 -binary
+    | openssl enc -base64
   with_items:
     - munin.{{ hostname }}.key
     - ca.key