cloudstack-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rohit Yadav <rohit.ya...@shapeblue.com>
Subject Re: [DISCUSS] Request for comments: Out-of-band Management for CloudStack (new feature)
Date Mon, 07 Mar 2016 09:21:40 GMT
Hi Ilya,

Thanks for the suggestions.

In the UI, we can easily have a warning statement on the pop up box if host maintenance is
enabled. We can also add mechanisms (for example specific APIs or zone/cluster level settings)
to allow admins to disable/enable the feature at zone and cluster level without cascading
it to the host enabled setting. Will update the FS to reflect these additions.

Regards.

> On 05-Mar-2016, at 7:11 AM, ilya <ilya.mailing.lists@gmail.com> wrote:
>
> Rohit,
>
> Great job!
>
> Not certain if this was mentioned, but premise behind IPMI integration
> was partially driven by HA and being able to "fence" the host in
> question to avoid split brain scenario - as well as other issues when
> hypervisors malfunction.
>
> With that said, Will brings up a good point, what can we offer to avoid
> accidental power down - while host is functional. I see plenty of
> curious cloudstack admins who identify a function of a button by
> pressing on it and saying "lets see what happens". Better yet, some
> learn on the job on production environments.
>
> Do we give the end user a warning of any kind? If possible, i would
> suggest we give a one line warning - something like "The host is not in
> Maintenance Mode, proceed at your own risk!" or something to that effect.
>
> Obviously this would only be CloudStack UI safeguard and no such warning
> would be shown when you use APIs directly.
>
> Lastly, please consider disable IPMI for Cluster and Zone level, i dont
> believe we need it for pod. Please dont cascade over every host ipmi
> object and change their state, instead, have a separate db entry (or
> else) that tracks this selection for cluster or zone.
>
> It could be as simple as configuration setting for zone or cluster.
>
> thanks
> ilya
>
>
> On 3/4/16 1:20 AM, Rohit Yadav wrote:
>>
>>
>> ShapeBlue <http://www.shapeblue.com>
>> Rohit Yadav
>> Software Architect   ,       ShapeBlue
>>
>> d:   * | s: +44 203 603 0540* <tel:|%20s:%20+44%20203%20603%200540>
>> |    m:      *+91 8826230892* <tel:+91%208826230892>
>>
>> e:   *rohit.yadav@shapeblue.com | t: *
>> <mailto:rohit.yadav@shapeblue.com%20|%20t:>   |      w:
>> *www.shapeblue.com* <http://www.shapeblue.com>
>>
>> a:   53 Chandos Place, Covent Garden London WC2N 4HS UK
>>
>> Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue
>> Services India LLP is a company incorporated in India and is operated
>> under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is
>> a company incorporated in Brasil and is operated under license from
>> Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company registered by The
>> Republic of South Africa and is traded under license from Shape Blue
>> Ltd. ShapeBlue is a registered trademark.
>> This email and any attachments to it may be confidential and are
>> intended solely for the use of the individual to whom it is addressed.
>> Any views or opinions expressed are solely those of the author and do
>> not necessarily represent those of Shape Blue Ltd or related companies.
>> If you are not the intended recipient of this email, you must neither
>> take any action based upon its contents, nor copy or show it to anyone.
>> Please contact the sender if you believe you have received this email in
>> error.
>>
>>
>>> On 03-Mar-2016, at 12:58 PM, Will Stevens <williamstevens@gmail.com
>>> <mailto:williamstevens@gmail.com>> wrote:
>>>
>>> Maybe I am not understanding something here.
>>>
>>> Does this control the power cycle of the management server(s) or the
>>> hypervisor hosts?  The wording is throwing me off.
>>
>> Fixed. The feature applies for hypervisor hosts only, not management
>> server hosts (unless of course, mgmt server host is hypervisor host as
>> well for example running mgmt server + kvm agnet on a KVM host).
>>
>>> I am guessing it is for managing the hypervisor hosts. If this is the
>>> case,
>>> does it also handle the "maintenance mode" for the host as well?
>>
>> Maintenance mode is a hypervisor semantic, this is not related to the
>> out-of-band management interface (the BMC, such as iLO, iDRAC) available
>> on the hypervisor host.
>>
>> Even when you enable/disable maintenance mode, you can use a tool like
>> ‘ipmitool’ to do execute a power management operation such as
>> on/off/reset etc, so you should be able to perform the same using this
>> feature. Therefore, presently there is no such enforcement.
>>
>>> At least
>>> with XenServer, if you do a power cycle without putting the host into
>>> maintenance mode first, all the VRs will have to be restarted on that host
>>> once it is back up in order for their networking to work again.
>>
>> We can put in a rule to avoid executing any power operation when hosts
>> are put in maintenance mode, though some users may still want to be able
>> to execute power operations. Comments?
>>
>> Regards.
>>
>> Find out more about ShapeBlue and our range of CloudStack related services:
>> IaaS Cloud Design & Build
>> <http://shapeblue.com/iaas-cloud-design-and-build//> | CSForge – rapid
>> IaaS deployment framework <http://shapeblue.com/csforge/>
>> CloudStack Consulting <http://shapeblue.com/cloudstack-consultancy/> |
>> CloudStack Software Engineering
>> <http://shapeblue.com/cloudstack-software-engineering/>
>> CloudStack Infrastructure Support
>> <http://shapeblue.com/cloudstack-infrastructure-support/> | CloudStack
>> Bootcamp Training Courses <http://shapeblue.com/cloudstack-training/>

Regards.

Find out more about ShapeBlue and our range of CloudStack related services:
IaaS Cloud Design & Build<http://shapeblue.com/iaas-cloud-design-and-build//> |
CSForge – rapid IaaS deployment framework<http://shapeblue.com/csforge/>
CloudStack Consulting<http://shapeblue.com/cloudstack-consultancy/> | CloudStack Software
Engineering<http://shapeblue.com/cloudstack-software-engineering/>
CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/>
| CloudStack Bootcamp Training Courses<http://shapeblue.com/cloudstack-training/>
Mime
View raw message