[PVE-User] Question about Proxmox HA

David Thompson david at digitaltransitions.ca
Sat Dec 7 16:38:37 CET 2013


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
>> _______________________________________________
>> pve-user mailing list
>> pve-user at pve.proxmox.com
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> 
> 
> 
> 
> -- 
> Gilberto Ferreira

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