use inventory_hostname instead of ansible_hostname

lamp_haproxy/roles/haproxy/templates/haproxy.cfg.j2

@@ -35,5 +35,5 @@ backend app
     {% endfor %}
     balance     {{ balance }}
     {% for host in groups['webservers'] %}
-        server {{ hostvars[host].ansible_hostname }} {{ hostvars[host]['ansible_' + iface].ipv4.address }}:{{ httpd_port }}
+        server {{ host }} {{ hostvars[host]['ansible_' + iface].ipv4.address }}:{{ httpd_port }}
     {% endfor %}

lamp_haproxy/rolling_update.yml

@@ -18,12 +18,12 @@
   # These are the tasks to run before applying updates:
   pre_tasks:
   - name: disable nagios alerts for this host webserver service
-    nagios: action=disable_alerts host={{ ansible_hostname }} services=webserver
+    nagios: action=disable_alerts host={{ inventory_hostname }} services=webserver
     delegate_to: "{{ item }}"
     with_items: groups.monitoring
 
   - name: disable the server in haproxy
-    shell: echo "disable server myapplb/{{ ansible_hostname }}" | socat stdio /var/lib/haproxy/stats
+    shell: echo "disable server myapplb/{{ inventory_hostname }}" | socat stdio /var/lib/haproxy/stats
     delegate_to: "{{ item }}"
     with_items: groups.lbservers
 
@@ -35,11 +35,11 @@
   # These tasks run after the roles:
   post_tasks:
   - name: Enable the server in haproxy
-    shell: echo "enable server myapplb/{{ ansible_hostname }}" | socat stdio /var/lib/haproxy/stats
+    shell: echo "enable server myapplb/{{ inventory_hostname }}" | socat stdio /var/lib/haproxy/stats
     delegate_to: "{{ item }}"
     with_items: groups.lbservers
 
   - name: re-enable nagios alerts
-    nagios: action=enable_alerts host={{ ansible_hostname }} services=webserver
+    nagios: action=enable_alerts host={{ inventory_hostname }} services=webserver
     delegate_to: "{{ item }}"
     with_items: groups.monitoring

language_features/upgraded_vars.yml

@@ -11,7 +11,7 @@
         - c
 
     tasks:
-      - shell: echo hello {{ ansible_hostname.upper() }}
+      - debug: msg="hello {{ ansible_hostname.upper() }}"
 
       - shell: echo match
         when: 2 == 2
@@ -19,7 +19,7 @@
       - shell: echo no match
         when: 2 == 2 + 1
 
-      - shell: echo {{ ansible_os_family }}
+      - debug: msg="{{ ansible_os_family }}"
 
       - shell: echo {{ item }}
         with_items: a_list