cluster_template.j2

{
  "blueprint" : "{{ blueprint_name }}",
  "config_recommendation_strategy" : "{{ config_recommendation_strategy }}",
{% if ambari_version is version_compare('2.6', '>=') %}
  "repository_version_id": "{{ vdf_id }}",
{% endif %}
  "default_password" : "{{ default_password }}",
{% if security|lower != "none" %}
  "credentials" : [
    {
      "alias" : "kdc.admin.credential",
{% if security|lower == "mit-kdc" %}
      "principal" : "{{ security_options.admin_principal }}/admin@{{ security_options.realm | upper }}",
{% else %}
      "principal" : "{{ security_options.admin_principal }}@{{ security_options.realm | upper }}",
{% endif %}
      "key" : "{{ security_options.admin_password }}",
      "type" : "TEMPORARY"
    }
  ],
  "security" : {
    "type" : "KERBEROS"
  },
{% endif %}
{#
  The following attempts to find out the Ansible groups that map on the blueprint's host_groups.
  When using a dynamic blueprint this should work fine as it knows the host_groups from the 'blueprint_dynamic' variable.
  When using a static blueprint, this might sometimes fail, as it simply does the regex check in the blueprint's content.
#}
  "host_groups" :[
    {% for group in groups|sort if group not in ['all', 'ungrouped'] and groups[group]|length > 0 and (blueprint_file == 'blueprint_dynamic.j2' and group in blueprint_dynamic|map(attribute='host_group')|list) or (blueprint_file != 'blueprint_dynamic.j2' and blueprint_static['host_groups'] | string is search(group)) %}

    {
      "name" : "{{ group }}",
      "hosts" : [
        {% for node in groups[group]|sort -%}

        { "fqdn" : "{{ hostvars[node]['ansible_fqdn'] | lower }}", "rack_info": "{{ hostvars[node]['rack'] | default('/default-rack') }}" }{% if not loop.last %},{% endif %}

        {% endfor %}

      ]
    }{% if not loop.last %},{% endif %}
    {% endfor %}

  ]
}