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[tripleo] Scale up/down Ansible tasks


On Wed, Apr 10, 2019 at 6:30 PM John Fulton <johfulto at redhat.com> wrote:

> In the Ceph case ceph-ansible has playbooks to correctly handle the
> scale down of different ceph services, e.g. delete a monitor [1] or
> delete an OSD [2]. The process would be to generate a ceph-ansible
> inventory, e.g. the same way we do when we scale up [3], and then
> execute one of those playbooks with that inventory. Examples of
> running these playbook are in Seb's blog [4].
>
> This would be a great feature to have because if you don't tell the
> Ceph cluster that a node is not part of it anymore, then it will want
> to find it and not be happy if you just delete the node. It's better
> to tell the ceph cluster not to worry about a particular node anymore
> by running one of these playbooks before the node is deleted.
>

So if I'm not mistaken, these tasks need to run within the mistral_executor
on the Undercloud against a generated ceph-ansible inventory. Which means,
no tasks are run on hosts on local mode.
Let me know if I'm wrong, I'll make sure this is working fine for the scale
tasks.
-- 
Emilien Macchi
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