title: concatenate variables in Jinja2
body: <p>I'm struggling with the following example data from Satellite server when templating with Jinja2 in Ansible:</p>
  
  <pre><code>"results": {
      "test.example.com": {
          "interfaces": "eth0,lo",
          "ipaddress_eth0": "10.251.0.45",
          "ipaddress_lo": "127.0.0.1",
          "netmask_eth0": "255.255.255.0",
          "netmask_lo": "255.0.0.0",
          "network_eth0": "10.251.0.0",
          "network_lo": "127.0.0.0",
  </code></pre>
  
  <p>This piece of code will return: 127.0.0.1, but I want to replace 'ipaddress_lo' with the variable interface.
  I've tried a million combinations... without any luck... please advice.</p>
  
  <pre><code>{% for items in my_host_facts.json.results %}
  {% for interface in my_host_facts.json.results[items].interfaces.split(",") %}
     {{ interface }}:
          address: "{{ my_host_facts.json.results[items].ipaddress_lo }}"
          netmask: "{{ my_subnet.json.mask }}"
          network: "{{ my_subnet.json.network }}"
          gateway: "{{ my_subnet.json.gateway }}"
  {% endfor %}
      dns: [ "{{ my_subnet.json.dns_primary }}", "{{ my_subnet.json.dns_secondary }}" ]
  {% endfor %}
  </code></pre>
  
  <p>Kind regards,</p>