[PVE-User] Question about Proxmox HA

Gilberto Nunes gilberto.nunes32 at gmail.com
Sat Dec 7 19:04:12 CET 2013


Just a correction: is an i5 laptop...


2013/12/7 Gilberto Nunes <gilberto.nunes32 at gmail.com>

> 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
>>>>>>
>>>>>>  _______________________________________________
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>>>>>> 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
>



-- 
Gilberto Ferreira
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