[Kolla Ansible] host maintenance

Tony Liu tonyliu0592 at hotmail.com
Mon Aug 24 16:53:02 UTC 2020

> -----Original Message-----
> From: Mark Goddard <mark at stackhpc.com>
> Sent: Monday, August 24, 2020 12:46 AM
> To: Eric K. Miller <emiller at genesishosting.com>
> Cc: openstack-discuss <openstack-discuss at lists.openstack.org>
> Subject: Re: [Kolla Ansible] host maintenance
> On Sat, 22 Aug 2020 at 01:10, Eric K. Miller <emiller at genesishosting.com>
> wrote:
> >
> > > Actually, in my case, the setup is originally deploy by Kolla
> > > Ansible. Other than the initial deployment, I am looking for using
> > > Kolla Ansible for maintenance operations.
> > > What I am looking for, eg. replace a host, can surely be done by
> > > manual steps or customized script. I'd like to know if they are
> > > automated by Kolla Ansible.
> >
> > We do this often by simply using the "limit" flag in Kolla Ansible to
> only include the controllers and new compute node (after adding the
> compute node to the multinode.ini file).  Specify "reconfigure" for the
> action, and not "install".
> We need some better docs around this, and I think they will be added
> soon. Some things to watch out for:
> * if adding a new controller, ensure that if using --limit, all
> controllers are included and do not use serial mode

What I tried was to replace a controller, where I don't need to
update other controllers, because there is no address update.

If there is address update caused by controller change, then all
controllers have to be included to get update.

What's "serial mode"?

> * if removing a controller, reconfigure other controllers to update the
> RabbitMQ & Galera cluster nodes etc.

In this case, are those services who don't need any updates going
to be restarted or untouched?


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