icinga: create host entries for all hosts known to ansible

roles/icinga/tasks/main.yml

@@ -61,6 +61,10 @@
   changed_when: "'for these changes to take effect' in features_result.stdout"
   notify: Restart icinga2
 
+- name: Configure known hosts for icinga
+  template: src=icinga2/conf.d/hosts.conf.j2 dest=/etc/icinga2/conf.d/hosts.conf owner={{ icinga_user }} group={{ icinga_group }}
+  notify: Restart icinga2
+
 - name: Create group icingaweb2
   group: name=icingaweb2 system=yes
 

roles/icinga/templates/icinga2/conf.d/hosts.conf.j2

@@ -0,0 +1,12 @@
+{% for host in groups['all'] %}
+object Host "{{ host }}" {
+  /* Import the default host template defined in `templates.conf`. */
+  import "generic-host"
+
+  /* Specify the address attributes for checks e.g. `ssh` or `http`. */
+  address = "{{ host }}"
+
+  /* Set custom variable `os` for hostgroup assignment in `groups.conf`. */
+  vars.os = "Linux"
+}
+{% endfor %}