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DB needed for control but some clouds store tokens in sql as well as
locally-defined users. Don't forget analytics and if you use things like
contrail, you have cassandra/mongodb for peripheral services as well.

We're continuing to iterate through the requirements against current
reality - I appreciate the perspectives!

//adam


*Adam Lawson*

AQORN, Inc.
427 North Tatnall Street
Ste. 58461
Wilmington, Delaware 19801-2230
Toll-free: (844) 4-AQORN-NOW ext. 101
International: +1 302-387-4660
Direct: +1 916-246-2072

On Wed, Mar 9, 2016 at 11:15 PM, Yuriy Brodskiy <ybrodskiy at gmail.com> wrote:

> Database only needed for control operations.
> During upgrade we disable API (mark down on LB or take them down). This
> will prevent users from making any database changes.
>
> After that flow is "simple"
> - backup db
> - do a migration
> - perform your validation tests
>
> If all good, bring up your api, if not, restore db backup to rollback
>
> I'm over simplifying it here but this is basic concepts. You will find
> more details in the video
>
>
>
>
>
> On Wed, Mar 9, 2016 at 10:38 PM -0800, "Xav Paice" <xavpaice at gmail.com>
> wrote:
>
>
>>
>> On 10 March 2016 at 19:26, Yuriy Brodskiy <ybrodskiy at gmail.com> wrote:
>>
>>> building a new cloud is not practical for real production environments.
>>> even if you can afford it, how do you migrate data?
>>>
>>> We have been doing upgrades for a while now, and came up with few basic
>>> principles:
>>> 1) you don't have to upgrade all at the same time. do it component at
>>> the time
>>> 2) stand up a new version along side of an existing one, test it and
>>> then flip DNS
>>>
>>> Take a look at presentation team did during Vancouver summit
>>>
>>> https://www.openstack.org/summit/vancouver-2015/summit-videos/presentation/10-minutes-openstack-upgrades-done
>>>
>>>
>> (replying to the list this time, and regretting using gmail)
>>
>> I readily admit to not having watched that video (but will!) - one
>> question.  How do you deal with the db migration if you have two versions
>> running at the same time?
>>
>>>
>>>
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