fuel-dev team mailing list archive

[Mike Scherbakov <mscherbakov@xxxxxxxxxxxx>]

I think it is the time to start thinking about default allocation of roles
then, aka Fuel suggests, based on hardware information.
So user won't forget to add some specific roles, and the experience will be
much more simple - just add nodes to the env, and correct roles / disks /
networks placements..


On Tue, Feb 4, 2014 at 10:03 AM, Roman Alekseenkov <
ralekseenkov@xxxxxxxxxxxx> wrote:

> Based on our experience with Ceph, I would say it should be role-based.
> Meaning, option #2.
>
> We made a decision to always deploy Ceph monitors on controllers (that
> would be an equivalent of option #1) and this decision turned out not to be
> the right one. Dmitry can shed more light on this, I think.
>
> Roman
>
>
> On Mon, Feb 3, 2014 at 9:44 PM, Mike Scherbakov <mscherbakov@xxxxxxxxxxxx>wrote:
>
>> +David, Nadya
>>
>> Hi Max,
>> as we discussed verbally there is a major concern behind - about
>> placement of MongoDB. As I understand right, it is expected that there is a
>> huge disk IO consumption in case of larger deployments (let's say >50
>> nodes).
>> If it is the case, then I would agree that we may not want to use shared
>> disks for MongoDB and other OpenStack components. I see two options here:
>>
>>
>>    1. Make sure MongoDB uses dedicated disk(s) on the server where it's
>>    installed, and it can be part of existing controller role then
>>       - Nailgun can make default allocation in a way that MongoDB has
>>       dedicated disk by default, if there is more than one disk on the server
>>       (which is 100% of real cases, I assume)
>>       - *User's experience would be simply to enable Ceilometer
>>       installation by clicking on checkbox.* In simple mode, ceilometer
>>       + mongo will be installed on controller node. In HA mode, ceilometer +
>>       mongo will be installed on all 3 controllers under pacemaker control
>>    2. Make sure MongoDB is installed on a separated server
>>    - In UI, user will have to:
>>          - enable ceilometer checkbox ("Install Ceilometer")
>>          - don't forget to add "ceilometer-db" (mongodb) role to one of
>>          the unallocated nodes
>>             - UI must ensure that this role should not intersect with
>>             any other
>>             - UI must ensure that this role is assigned to at least one
>>             node in the env, if ceilometer checkbox is enabled
>>             - UI must ensure that this role is assigned to at least 3
>>             different unallocated nodes in case of HA deployment mode, to ensure that
>>             we will have Ceilometer HA (we can skip this, but add logic that if we have
>>             more than one mongo - we must build cluster)
>>
>> In terms of simplicity and ease of use, I would vote for option #1, while
>> leaving ability to place MongoDB on a separate server via Fuel CLI for
>> customized deployments. #1 solves the issue with disk IO by providing
>> dedicated disk(s).
>>
>> > Do we need HA Cluster with non-HA Mongo?
>> For consistency over Fuel story, I vote for HA for all OpenStack
>> components, if HA mode is chosen. So my opinion is no - we do not need such
>> a case.
>>
>> > Puppet manifest are  finished
>> Great! Please pull request them asap - we will need time for reviews. I
>> hope we can complete manifests for HA story by the end of the week too.
>>
>> Thanks,
>>
>>
>> On Mon, Feb 3, 2014 at 5:37 PM, Max Mazur <mmaxur@xxxxxxxxxxxx> wrote:
>>
>>> Hi!
>>>
>>>
>>> I'd like to add to Fuel the following options:
>>>
>>> 1. Simple install
>>>  - Ceilometer with MongoDB or Ceilometer wit If customer selected Mongo
>>> it is necessary to deploy one more node with MongoDB
>>> Puppet manifest are  finished
>>>
>>> 2. HA Mode
>>>  - Ceilometer with MongoDB replica set.  In this case we need 3 MongoDB
>>> nodes to build HA replica set.
>>> Puppet manifests are in progress now
>>>
>>>
>>> Do we need HA Cluster with non-HA Mongo?
>>>
>>> Best Regards,
>>> Max Mazur
>>>
>>>
>>>
>>> --
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>>
>>
>>
>> --
>> Mike Scherbakov
>> #mihgen
>>
>> --
>> Mailing list: https://launchpad.net/~fuel-dev
>> Post to     : fuel-dev@xxxxxxxxxxxxxxxxxxx
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>>
>>
>


-- 
Mike Scherbakov
#mihgen