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From Boris Stoyanov <boris.stoya...@shapeblue.com>
Subject Re: Problems with KVM HA & STONITH
Date Thu, 05 Apr 2018 07:48:46 GMT
Hi Victor, 
Host HA is working only with KVM + NFS. Ceph is not supported at this stage. Obviously RAW
volumes are not supported on your pool, but I’m not sure if that’s because of Ceph or
HA in general. Are you able to deploy a non-ha VM?

Boris Stoyanov


boris.stoyanov@shapeblue.com 
www.shapeblue.com
53 Chandos Place, Covent Garden, London  WC2N 4HSUK
@shapeblue
  
 

> On 5 Apr 2018, at 4:19, victor <victor@ihnetworks.com> wrote:
> 
> Hello Rohit,
> 
> Is the Host HA provider start working with Ceph. The reason I am asking is because, I
am not able to create a VM with Ceph storage in a kvm host with HA enabled and I am getting
the following error while creating VM.
> 
> ============
> .cloud.exception.StorageUnavailableException: Resource [StoragePool:2] is unreachable:
Unable to create Vol[9|vm=6|DATADISK]:com.cloud.utils.exception.CloudRuntimeException: org.libvirt.LibvirtException:
unsupported configuration: only RAW volumes are supported by this storage pool
> ============
> 
> Regards
> Victor
> 
> On 11/04/2017 09:53 PM, Rohit Yadav wrote:
>> Hi James, (/cc Simon and others),
>> 
>> 
>> A new feature exists in upcoming ACS 4.11, Host HA:
>> 
>> https://cwiki.apache.org/confluence/display/CLOUDSTACK/Host+HA
>> 
>> You can read more about it here as well: http://www.shapeblue.com/host-ha-for-kvm-hosts-in-cloudstack/
>> 
>> This feature can use a custom HA provider, with default HA provider implemented for
KVM and NFS, and uses ipmi based fencing (STONITH) of the host. The current HA mechanism provides
no such method of fencing (powering off) a host and it depends under what circumstances the
VM HA is failing (environment issues, ACS version etc).
>> 
>> As Simon mentioned, we have a (host) HA provider that works with Ceph in near future.
>> 
>> Regards.
>> 
>> ________________________________
>> From: Simon Weller <sweller@ena.com.INVALID>
>> Sent: Thursday, November 2, 2017 7:27:22 PM
>> To: users@cloudstack.apache.org
>> Subject: Re: Problems with KVM HA & STONITH
>> 
>> James,
>> 
>> 
>> Ceph is a great solution and we run all of our ACS storage on Ceph. Note that it
adds another layer of complexity to your installation, so you're going need to develop some
expertise with that platform to get comfortable with how it works. Typically you don't want
to mix Ceph with your ACS hosts. We in fact deploy 3 separate Ceph Monitors, and then scale
OSDs as required on a per cluster basis in order to add additional resiliency (So every KVM
ACS cluster has it's own Ceph "POD").  We also use Ceph for S3 storage (on completely separate
Ceph clusters) for some other services.
>> 
>> 
>> NFS is much simpler to maintain for smaller installations in my opinion. If the IO
load you're looking at isn't going to be insanely high, you could look at building a 2 node
NFS cluster using pacemaker and DRDB for data replication between nodes. That would reduce
your storage requirement to 2 fairly low power servers (NFS is not very cpu intensive). Currently
on a host failure when using a storage other than NFS on KVM, you will not see HA occur until
you take the failed host out of the ACS cluster. This is a historical limitation because ACS
could not confirm the host had been fenced correctly, so to avoid potential data corruption
(due to 2 hosts mounting the same storage), it doesn't do anything until the operator intervenes.
As of ACS 4.10, IPMI based fencing is now supported on NFS and we're planning on developing
similar support for Ceph.
>> 
>> 
>> Since you're an school district, I'm more than happy to jump on the phone with you
to talk you through these options if you'd like.
>> 
>> 
>> - Si
>> 
>> 
>> ________________________________
>> From: McClune, James <mcclunej@norwalktruckers.net>
>> Sent: Thursday, November 2, 2017 8:28 AM
>> To: users@cloudstack.apache.org
>> Subject: Re: Problems with KVM HA & STONITH
>> 
>> Hi Simon,
>> 
>> Thanks for getting back to me. I created one single NFS share and added it
>> as primary storage. I think I better understand how the storage works, with
>> ACS.
>> 
>> I was able to get HA working with one NFS storage, which is good. However,
>> is there a way to incorporate multiple NFS storage pools and still have the
>> HA functionality? I think something like GlusterFS or Ceph (like Ivan and
>> Dag described) will work better.
>> 
>> Thank you Simon, Ivan, and Dag for your assistance!
>> James
>> 
>> On Wed, Nov 1, 2017 at 10:10 AM, Simon Weller <sweller@ena.com.invalid>
>> wrote:
>> 
>>> James,
>>> 
>>> 
>>> Try just configuring a single NFS server and see if your setup works. If
>>> you have 3 NFS shares, across all 3 hosts, i'm wondering whether ACS is
>>> picking the one you rebooted as the storage for your VMs and when that
>>> storage goes away (when you bounce the host), all storage for your VMs
>>> vanishes and ACS tries to reboot your other hosts.
>>> 
>>> 
>>> Normally in a simple ACS setup, you would have a separate storage server
>>> that can serve up NFS to all hosts. If a host dies, then a VM would be
>>> brought up on a spare hosts since all hosts have access to the same storage.
>>> 
>>> Your other option is to use local storage, but that won't provide HA.
>>> 
>>> 
>>> - Si
>>> 
>>> 
>>> ________________________________
>>> From: McClune, James <mcclunej@norwalktruckers.net>
>>> Sent: Monday, October 30, 2017 2:26 PM
>>> To: users@cloudstack.apache.org
>>> Subject: Re: Problems with KVM HA & STONITH
>>> 
>>> Hi Dag,
>>> 
>>> Thank you for responding back. I am currently running ACS 4.9 on an Ubuntu
>>> 14.04 VM. I have the three nodes, each having about 1TB of primary storage
>>> (NFS) and 1TB of secondary storage (NFS). I added each NFS share into ACS.
>>> All nodes are in a cluster.
>>> 
>>> Maybe I'm not understanding the setup or misconfigured something. I'm
>>> trying to setup an HA environment where if one node goes down, running an
>>> HA marked VM, the VM will start on another host. When I simulate a network
>>> disconnect or reboot of a host, all of the nodes go down (STONITH?).
>>> 
>>> I am unsure on how to setup an HA environment, if all the nodes in the
>>> cluster go down. Any help is much appreciated!
>>> 
>>> Thanks,
>>> James
>>> 
>>> On Mon, Oct 30, 2017 at 3:49 AM, Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
>>> wrote:
>>> 
>>>> Hi James,
>>>> 
>>>> I think  you possibly have over-configured your KVM hosts. If you use NFS
>>>> (and no clustered file system like CLVM) then there should be no need to
>>>> configure STONITH. CloudStack takes care of your HA, so this is not
>>>> something you offload to the KVM host.
>>>> 
>>>> (As mentioned the only time I have played with STONITH and CloudStack was
>>>> for CLVM – and I eventually found it not fit for purpose, too unstable
>>> and
>>>> causing too many issues like you describe. Note this was for block
>>> storage
>>>> though – not NFS).
>>>> 
>>>> Regards,
>>>> Dag Sonstebo
>>>> Cloud Architect
>>>> ShapeBlue
>>>> 
>>>> On 28/10/2017, 03:40, "Ivan Kudryavtsev" <kudryavtsev_ia@bw-sw.com>
>>> wrote:
>>>>     Hi. If the node losts nfs host it reboots (acs agent behaviour). If
>>> you
>>>>     really have 3 storages, you'll go clusterwide reboot everytime your
>>>> host is
>>>>     down.
>>>> 
>>>>     28 окт. 2017 г. 3:02 пользователь "Simon Weller"
>>>> <sweller@ena.com.invalid>
>>>>     написал:
>>>> 
>>>>     > Hi James,
>>>>     >
>>>>     >
>>>>     > Can you elaborate a bit further on the storage? You say you're
>>>> running NFS
>>>>     > on all 3 nodes, can you explain how it is setup?
>>>>     >
>>>>     > Also, what version of ACS are you running?
>>>>     >
>>>>     >
>>>>     > - Si
>>>>     >
>>>>     >
>>>>     >
>>>>     >
>>>>     > ________________________________
>>>>     > From: McClune, James <mcclunej@norwalktruckers.net>
>>>>     > Sent: Friday, October 27, 2017 2:21 PM
>>>>     > To: users@cloudstack.apache.org
>>>>     > Subject: Problems with KVM HA & STONITH
>>>>     >
>>>>     > Hello Apache CloudStack Community,
>>>>     >
>>>>     > My setup consists of the following:
>>>>     >
>>>>     > - Three nodes (NODE1, NODE2, and NODE3)
>>>>     > NODE1 is running Ubuntu 16.04.3, NODE2 is running Ubuntu 16.04.3,
>>>> and NODE3
>>>>     > is running Ubuntu 14.04.5.
>>>>     > - Management Server (running on separate VM, not in cluster)
>>>>     >
>>>>     > The three nodes use KVM as the hypervisor. I also configured
>>> primary
>>>> and
>>>>     > secondary storage on all three of the nodes. I'm using NFS for the
>>>> primary
>>>>     > & secondary storage. VM operations work great. Live migration
works
>>>> great.
>>>>     >
>>>>     > However, when a host goes down, the HA functionality does not work
>>>> at all.
>>>>     > Instead of spinning up the VM on another available host, the down
>>>> host
>>>>     > seems to trigger STONITH. When STONITH happens, all hosts in the
>>>> cluster go
>>>>     > down. This not only causes no HA, but also downs perfectly good
>>>> VM's. I
>>>>     > have read countless articles and documentation related to this
>>>> issue. I
>>>>     > still cannot find a viable solution for this issue. I really want
>>> to
>>>> use
>>>>     > Apache CloudStack, but cannot implement this in production when
>>>> STONITH
>>>>     > happens.
>>>>     >
>>>>     > I think I have something misconfigured. I thought I would reach
out
>>>> to the
>>>>     > CloudStack community and ask for some friendly assistance.
>>>>     >
>>>>     > If there is anything (system-wise) you request in order to further
>>>>     > troubleshoot this issue, please let me know and I'll send. I
>>>> appreciate any
>>>>     > help in this issue!
>>>>     >
>>>>     > --
>>>>     >
>>>>     > Thanks,
>>>>     >
>>>>     > James
>>>>     >
>>>> 
>>>> 
>>>> 
>>>> Dag.Sonstebo@shapeblue.com
>>>> www.shapeblue.com<http://www.shapeblue.com>
>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]<http://www.shapeblue.com/>
>> 
>> Shapeblue - The CloudStack Company<http://www.shapeblue.com/>
>> www.shapeblue.com<http://www.shapeblue.com>
>> Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a framework
developed by ShapeBlue to deliver the rapid deployment of a standardised ...
>> 
>> 
>> 
>>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png
>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]
>> 
>> ]<
>>> http://www.shapeblue.com/>
>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]<http://www.shapeblue.com/>
>> 
>> Shapeblue - The CloudStack Company<http://www.shapeblue.com/>
>> www.shapeblue.com<http://www.shapeblue.com>
>> Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a framework
developed by ShapeBlue to deliver the rapid deployment of a standardised ...
>> 
>> 
>> 
>>> Shapeblue - The CloudStack Company<http://www.shapeblue.com/>
>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]<http://www.shapeblue.com/>
>> 
>> Shapeblue - The CloudStack Company<http://www.shapeblue.com/>
>> www.shapeblue.com<http://www.shapeblue.com>
>> Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a framework
developed by ShapeBlue to deliver the rapid deployment of a standardised ...
>> 
>> 
>> 
>>> www.shapeblue.com<http://www.shapeblue.com>
>> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]<http://www.shapeblue.com/>
>> 
>> Shapeblue - The CloudStack Company<http://www.shapeblue.com/>
>> www.shapeblue.com<http://www.shapeblue.com>
>> Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a framework
developed by ShapeBlue to deliver the rapid deployment of a standardised ...
>> 
>> 
>> 
>>> Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a
>>> framework developed by ShapeBlue to deliver the rapid deployment of a
>>> standardised ...
>>> 
>>> 
>>> 
>>>> 53 Chandos Place, Covent Garden, London  WC2N 4HSUK
>>>> @shapeblue
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> --
>>> 
>>> 
>>> 
>>> James McClune
>>> 
>>> Technical Support Specialist
>>> 
>>> Norwalk City Schools
>>> 
>>> Phone: 419-660-6590
>>> 
>>> mcclunej@norwalktruckers.net
>>> 
>> 
>> 
>> --
>> 
>> 
>> 
>> James McClune
>> 
>> Technical Support Specialist
>> 
>> Norwalk City Schools
>> 
>> Phone: 419-660-6590
>> 
>> mcclunej@norwalktruckers.net
>> 
>> rohit.yadav@shapeblue.com
>> www.shapeblue.com
>> 53 Chandos Place, Covent Garden, London  WC2N 4HSUK
>> @shapeblue
>>     
>> 
> 

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