hostvars missing ansible_host

[jdelStrother]

Hi there - I'm trying to use molecule to test some existing ansible code, using the docker driver to set up a throwaway host in CI.

It seems like when running in molecule, I'm missing some metadata on hostvars that usually can be used to access vars across all your hosts. eg I've got this in a template file:

{% for host in groups["netdata_enabled"] %}
upstream backend-{{host}} {
    server {{hostvars[host].ansible_host}}:19999;
}
{% endfor %}

that ought to generate a file along the lines of

upstream backend-app1 {
    server 10.12.86.1:19999;
}
upstream backend-app2 {
    server 10.12.86.2:19999;
}

This seems to run fine in 'normal' ansible, but in molecule I get:

ansible.errors.AnsibleUndefinedVariable: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'ansible_host'. 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'ansible_host'

What am I missing? Any suggestions on working around this?

[jdelStrother]

Bah, ok - our playbooks use hostvars[host].ansible_host as a standin for the internal ipv4 address, but I suppose that's not always true, and I guess I can see that ansible_host might not be set on a docker connection. I'm going to replace our usage of ansible_host with ansible_default_ipv4.address, which ought to sidestep the issue.