[PVE-User] Question about Proxmox HA

Gilberto Nunes gilberto.nunes32 at gmail.com
Sat Dec 7 19:00:16 CET 2013


Yes... That's sounds good...

However, my tests running out in a LG laptop i3 64bits with 4 GB of
memory...
I just run two PVE into VirtualBox and make my laptop act like a NFS
storage...
Payful, but for testing purpose, running pretty well...

Thanks Leslie for you background... Do not forget to keep us updated about
your progress

Cheers...


2013/12/7 Leslie-Alexandre DENIS <infoslad at gmail.com>

>  Hi everybody,
>
> Just to say, I'm currently building a HA topology that consists of 3
> nodes, one NFS or iSCSI filer and 2 hypervisors with HA capability.
> All of my experiments are far from finished but I can understand the
> Gilberto's point of view regarding fencing vs scripting plus manual tasks.
> You can consider to "fence" in a semi-auto way with fping and L2/L3 probes
> if you don't have all the hardware necessary to fence correctly.
> The result is almost the same if you do it correctly.
>
> I'll let you know how I had setup my HA after my labs tests.
>
> PS : concerning the NFS storage, you might want to virtualize some
> FreenNAS or custom SAN software solution on top of ZFS and replicate the
> data to another VM.
> I would love to hear some feedbacks about that type of solution because It
> adds some SPOF to the topology.
>
> Kind regards,
> Le 07/12/2013 16:53, Gilberto Nunes a écrit :
>
> 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
>>>  _______________________________________________
>>> 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
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