[openstack-dev] [puppet] [ceph] Managing a ceph cluster's lifecycle with puppet

David Moreau Simard dmsimard at iweb.com
Sun May 31 21:06:17 UTC 2015

Hey Bryan,

The configuration is done through a provider - you can use it in your
composition layer, your site.pp or wherever else you want - a bit like this:

ceph_config {
    'osd/osd_journal_size', value => '16384';
    'osd/osd_max_backfills', value => '1';
    # ...
    'client/rbd_cache': value => 'true';
    'client/rbd_cache_writethrough_until_flush' => 'true'

Off the top of my head, the major things that the module does not
currently do:
- Advanced pool configuration (Erasure coded pools, Cache tiering)
- CRUSH Map management

In general, puppet-ceph is still early in the development process
compared to mature and feature-full modules like puppet-nova,
puppet-neutron or puppet-cinder.
Contributions and feedback is definitely welcome !

Personally I use puppet-ceph to bootstrap the installation of the
nodes/OSDs and manage the cluster's critical configuration manually.

For upgrading the cluster, I'm biased towards orchestrating this with
another tool like Ansible since you usually want to control which server
you upgrade first.

David Moreau Simard

On 2015-05-29 05:32 PM, Stillwell, Bryan wrote:
> Hey guys,
> One of my top tasks this quarter is to puppetize our ceph environments.
> I've already spent some time going over the module, but wanted to start a
> conversation around some of the tasks I would like the module to do.
> Currently I'm planning on doing the work in the following phases:
> Phase 1 - Switch the installation of ceph packages, management of
> ceph.conf,
>           and management of cephx keys from ceph-deploy to puppet-ceph.
> Phase 2 - Switch the installation and management of mon nodes to be handled
>           by puppet-ceph.
> Phase 3 - Switch the installation and management of osd nodes to be handled
>           by puppet-ceph.
> I'm mostly done with phase 1, but wanted to ask what the best way to handle
> additional options are in the config file?  I want to be able to manage
> options like the following:
> [osd]
> osd_journal_size = 16384
> osd_max_backfills = 1
> osd_recovery_max_active = 1
> osd_recovery_op_priority = 1
> osd_recovery_max_single_start = 1
> osd_op_threads = 12
> osd_crush_initial_weight = 0
> [client]
> rbd cache = true
> rbd cache writethrough until flush = true
> Phase 2 seems pretty straight-forward at this point, but if you guys have
> any things I should watch out for I wouldn't mind hearing them.
> Phase 3 is where I have the most questions:
> How well does puppet-ceph handle pool configuration?
> Can it handle setting the room/row/rack/node in the CRUSH map when adding
> new nodes?
> What's the best process for replace a failed HDD?  Journal drive?
> How could we use best utilize puppet-ceph for augmenting an existing
> cluster
> without causing performance problems?
> Is there a good way to decommission hardware?
> Any ideas around managing ceph rules?  (default, ssd-only pools, primary
> affinity, cache tiering, erasure coding)
> What's it look like to upgrade a ceph cluster with puppet-ceph?
> Thanks,
> Bryan Stillwell
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