[PVE-User] Question about Proxmox HA

Gilberto Nunes gilberto.nunes32 at gmail.com
Sat Dec 7 16:53:09 CET 2013


No... No DRBD at all...

I lead here with two server and plus one, as a NFS shared storage....




2013/12/7 David Thompson <david at digitaltransitions.ca>

> Ok, I can see how that might work. I still don’t see how its beneficial if
> you have to circumvent the technology built into the server such as running
> other scripts to get it up and running manually.
> Thanks for the information. I’m still curious to hear from others who run
> this type of solution.
>
> I take it you are running this on a 2 node cluster with DRBD then correct?
> Still trying to wrap my head all around the world of high availability and
> how to best address this type of solution.
>
> I like proxmox far more than other solutions, especially for the fact that
> its Open Sourced and unlike proprietary solutions, has zero / no hooks that
> lead anything back to the NSA unless I am mistaken.
>
>
>
> David
>
>
>
>
> On Dec 7, 2013, at 10:07 AM, Gilberto Nunes <gilberto.nunes32 at gmail.com>
> wrote:
>
> Hi David
>
> Thanks for your response...
>
> I think that the mainly goal is exclude the fence device from two node
> plus Storage, and to keep the things more flexible and more simple...
>
> On the other hand, there's a lot of script settings that we can handle to
> bring the VM on line quickly as possible.
>
> So, some of us, wants keep the scenario more simple as possible and, if
> Proxmox can work without hardware fence, for me is much better, because it
> will be easier to explain to a possible customer, how many hardware they
> need to acquire... No special hardware like fence...
>
> Well.... At least for me, it's great....
>
>
> Thanks for other friends that response this thread...
>
> Cheers
>
>
> 2013/12/6 David Thompson <david at digitaltransitions.ca>
>
>> I can’t understand why one would build a HA cluster without fencing. I’ve
>> just finished building a HA cluster myself with IPMI fencing and I see the
>> fencing section as being the pivotal point for the whole setup to work
>> properly.
>>
>> I can only assume that if your node(s) go down, then they stay down and
>> you have to manually interject and power them up. Correct?
>>
>> Perhaps for a testing environment it might do, but if you’re testing a
>> system to deploy in production, wouldn’t one want to have the base (perhaps
>> not production hardware), but at a minimum the type of same software you’d
>> want to use? In this case IPMI enabled fencing, NFS backend storage, and
>> proxmox servers clustered? —> Or something of similar abilities.
>>
>> the fence_ipmilan section with the “power_wait” option seems to be the
>> crux that holds this all together efficiently, at least for those who are
>> using ipmi for fencing.
>>
>> Sorry, not trying to sound sarcastic and I apologize if I do, just trying
>> to figure out why one would build a system without the security that
>> fencing provides to HA for failover with the added ability to bring servers
>> back online automatically… Perhaps you or someone else here can explain
>> this more to me as to why one would do this. Just trying to get a good
>> solid grasp on HA clusters and different configurations that can be done
>> with them.
>>
>> Thanks,
>>
>> David
>>
>> On Dec 6, 2013, at 3:23 PM, Gilberto Nunes <gilberto.nunes32 at gmail.com>
>> wrote:
>>
>> I meant: I get it!!!
>>
>> That's work pretty awsome!!!
>>
>>
>> 2013/11/10 Gilberto Nunes <gilberto.nunes32 at gmail.com>
>>
>>> That's cool ahmad...
>>>
>>> I will try it as soon as I can...
>>>
>>> Thanks
>>>
>>>
>>> 2013/11/10 ahmad imanudin <ahmadiman1126 at gmail.com>
>>>
>>>>
>>>>> ----------------------------------------------------------------------
>>>>>
>>>>> Message: 1
>>>>> Date: Fri, 8 Nov 2013 11:40:58 -0200
>>>>> From: Gilberto Nunes <gilberto.nunes32 at gmail.com>
>>>>> To: pve-user at pve.proxmox.com
>>>>> Subject: [PVE-User] Question about Proxmox HA
>>>>> Message-ID:
>>>>>         <
>>>>> CAOKSTBt9Qr05nRKnYpEX2ksQjLL0D_JabRoDYy4N3NUEgs3i6Q at mail.gmail.com>
>>>>> Content-Type: text/plain; charset=ISO-8859-1
>>>>>
>>>>>
>>>>> Hello
>>>>>
>>>>> We have here a cluster created with 3 nodes and a simple storage...
>>>>> It's just to test porposes...
>>>>> There is no fence devices, for now.
>>>>> After setting up all Proxmox Hosts and VM's, when I turn off a VM on
>>>>> node1, for example, the VM is started on node2.
>>>>> But when I plugged off the network cable, the some doesn't happen!
>>>>>
>>>>> Why? Because the cluster is without fence device??
>>>>>
>>>>> Thanks...
>>>>>
>>>>
>>>> Hi Gilberto,
>>>>
>>>> I Have been testing Proxmox HA without fencing device and works. I test
>>>> with 2 nodes Proxmox but have not tried with 3 nodes. I also posting in my
>>>> blog about howto :
>>>> http://ahmad.imanudin.com/2013/08/18/tips-proxmox-configure-proxmox-high-availability-without-fencing-device/ with
>>>> indonesian language :D
>>>>
>>>> This is my Cluster configuration
>>>> *************************************
>>>> cp /etc/pve/cluster.conf /etc/pve/cluster.conf.new
>>>> nano /etc/pve/cluster.conf.new
>>>>
>>>> *<?xml version="1.0"?>*
>>>> *<cluster config_version="5" name="excellent">*
>>>> *<cman expected_votes="1"
>>>> keyfile="/var/lib/pve-cluster/corosync.authkey" two_node="1"/>*
>>>> *<fencedevices>*
>>>> *<fencedevice agent="fence_manual" name="human"/>*
>>>> *</fencedevices>*
>>>> *<clusternodes>*
>>>> *<clusternode name="pve1" nodeid="1" votes="1">*
>>>> *<fence>*
>>>> *<method name="single">*
>>>> *<device name="human" nodename="pve1"/>*
>>>> *</method>*
>>>> *</fence>*
>>>> *</clusternode>*
>>>> *<clusternode name="pve2" nodeid="2" votes="1">*
>>>> *<fence>*
>>>> *<method name="single">*
>>>> *<device name="human" nodename="pve2"/>*
>>>> *</method>*
>>>> *</fence>*
>>>> *</clusternode>*
>>>> *</clusternodes>*
>>>> *</cluster>*
>>>>
>>>> Note :
>>>> excellent = My Cluster name
>>>> pve1 = Hostname for Proxmox 1 (node 1)
>>>> pve2 = Hostname for Proxmox 2 (node 2)
>>>>
>>>> Importan : You must edit config_version every change cluster
>>>> configuration.
>>>>
>>>> Next you can configure VM with clue from here :
>>>> http://pve.proxmox.com/wiki/High_Availability_Cluster and try to power
>>>> off host Proxmox.
>>>> Example :
>>>>
>>>> I have VM running on Proxmox 1 (node1) and have been configured HA.
>>>> Forced off node 1 and run this command from node 2 to take over VM
>>>>
>>>> fence_ack_manual pve1 (pve1 is hostname node 1)
>>>>
>>>> after that, you must confirm with answer *absolutely*
>>>>
>>>> Thanks
>>>>
>>>> --
>>>>
>>>>
>>>> **
>>>> Best Regards,
>>>>
>>>>
>>>> Ahmad Imanudin -  Sharing is Beautiful !
>>>> Web : http://ahmad.imanudin.com, YM : ahmad_imanudin
>>>> FB : http://facebook.com/imanudin11 Twitter : @ahmad_9111
>>>>
>>>> _______________________________________________
>>>> pve-user mailing list
>>>> pve-user at pve.proxmox.com
>>>> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>>>>
>>>>
>>>
>>>
>>> --
>>> Gilberto Ferreira
>>>
>>
>>
>>
>> --
>> Gilberto Ferreira
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>>
>>
>>
>
>
> --
> Gilberto Ferreira
>
>
>


-- 
Gilberto Ferreira
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