Open Stack

Hey Markus,


> I'm wondering which possibilities I have to do group/host specific
> config file overrides. After reading [1], I'm still a little clueless.
> To be specific, I have this setup (expressed as Ansible inventory file):
>
>     [z_compute_nodes]
>     compute1
>     # more nodes
>     [x_compute_nodes]
>     compute2
>     # more nodes
>     [computes:children]
>     z_compute_nodes
>     x_compute_nodes
>
> As an example, I want to set Nova's config option
> `reserved_host_memory_mb` of the `DEFAULT` config file section:
>
>     ### nova.conf
>     [DEFAULT]
>     reserved_host_memory_mb=$VALUE
>
> My goal is this:
>
>              | reserved_host_memory_mb
>     ----------------------------------
>     compute1 |         256
>     compute2 |         512
>
> I know there are overrides like `nova_nova_conf_overrides`.
> So I tried to set a default override in `user_variables.yml`:
>
>     ### /etc/openstack_deploy/user_variables.yml --------
>
>     nova_nova_conf_overrides:
>       DEFAULT:
>         reserved_host_memory_mb: 512
>
> But I wanted to override this depending on the host in
> `openstack_user_config.yml`:
>
>     ### /etc/openstack_deploy/openstack_user_config.yml --------
>     # [...]
>     # nova hypervisors
>     compute_hosts:
>       compute1:
>         ip: 192.168.100.12
>         host_vars:
>           nova_nova_conf_overrides:
>             DEFAULT:
>               reserved_host_memory_mb: 256
>       compute2:
>         ip: 192.168.100.10
>

Try change "host_vars" to "container_vars".
If that doesn't work let me know, I'll spin up a test to recreate the
actual problem, but at a glance that looks correct otherwise.


>
> After testing this locally, it turned out that *both* hosts will
> have 512 for $VALUE. which was not my intended configuration.
>
> Please note that I only used 2 hosts here as an example but I'm looking
> for a solution which scales with much more hosts. I'm also applying
> those settings in a templated way like this:
>
>     ### /etc/openstack_deploy/openstack_user_config.yml --------
>     # [...]
>     # nova hypervisors
>     compute_hosts:
>     {% for host in groups['computes'] %}
>       {{ hostvars[host]['inventory_hostname'] }}:
>         ip: {{ hostvars[host]['ansible_host'] }}
>     {% endfor %}
>
> The reason is, that I use the same steps for different environments
> (dev, test, prod) with a different amount of nodes.
>
> Any tips how to do this properly?
>
>
Andy
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