[Linux-cluster] gfs2, kvm setup

J. Bruce Fields bfields at fieldses.org
Fri Jul 11 22:35:39 UTC 2008

On Thu, Jul 10, 2008 at 10:26:54AM +0100, Christine Caulfield wrote:
> J. Bruce Fields wrote:
>> On Wed, Jul 09, 2008 at 04:50:14PM +0100, Christine Caulfield wrote:
>>> J. Bruce Fields wrote:
>>>> On Wed, Jul 09, 2008 at 09:51:02AM +0100, Christine Caulfield wrote:
>>>>> Steven Whitehouse wrote:
>>>>>> Hi,
>>>>>> On Tue, 2008-07-08 at 18:15 -0400, J. Bruce Fields wrote:
>>>>>>> On Mon, Jul 07, 2008 at 02:49:28PM -0400, bfields wrote:
>>>>>>>> On Mon, Jul 07, 2008 at 10:48:28AM -0500, David Teigland wrote:
>>>>>>>>> On Sun, Jul 06, 2008 at 05:51:05PM -0400, J. Bruce Fields wrote:
>>>>>>>>>> -	write(control_fd, in, sizeof(struct gdlm_plock_info));
>>>>>>>>>> +	write(control_fd, in, sizeof(struct dlm_plock_info));
>>>>>>>>> Gah, sorry, I keep fixing that and it keeps reappearing.
>>>>>>>>>> Jul  1 14:06:42 piglet2 kernel: dlm: connect from non cluster node
>>>>>>>>>> It looks like dlm_new_workspace() is waiting on dlm_recoverd, which is
>>>>>>>>>> in "D" state in dlm_rcom_status(), so I guess the second node isn't
>>>>>>>>>> getting some dlm reply it expects?
>>>>>>>>> dlm inter-node communication is not working here for some reason.  There
>>>>>>>>> must be something unusual with the way the network is configured on the
>>>>>>>>> nodes, and/or a problem with the way the cluster code is applying the
>>>>>>>>> network config to the dlm.
>>>>>>>>> Ah, I just remembered what this sounds like; we see this kind of thing
>>>>>>>>> when a network interface has multiple IP addresses, and/or routing is
>>>>>>>>> configured strangely.  Others cc'ed could offer better details on exactly
>>>>>>>>> what to look for.
>>>>>>>> OK, thanks!  I'm trying to run gfs2 on 4 kvm machines, I'm an expert on
>>>>>>>> neither, and it's entirely likely there's some obvious misconfiguration.
>>>>>>>> On the kvm host there are 4 virtual interfaces bridged together:
>>>>>>> I ran wireshark on vnet0 while doing the second mount; what I saw was
>>>>>>> the second machine opened a tcp connection to port 21064 on the first
>>>>>>> (which had already completed the mount), and sent it a single message
>>>>>>> identified by wireshark as "DLM3" protocol, type recovery command:
>>>>>>> status command.  It got back an ACK then a RST.
>>>>>>> Then the same happened in the other direction, with the first machine
>>>>>>> sending a similar message to port 21064 on the second, which then reset
>>>>>>> the connection.
>>>>> That's a symptom of the "connect from non-cluster node" error in 
>>>>> the  DLM.
>>>> I think I am getting a message to that affect in my logs.
>>>>> It's got a connection from an IP address that is not known to 
>>>>> cman.   So it closes it as a spoofer
>>>> OK.  Is there an easy way to see the list of ip addresses known to cman?
>>> yes,
>>>   cman_tool nodes -a
>>> will show you all the nodes and their known IP addresses
>> piglet2:~# cman_tool nodes -a
>> Node  Sts   Inc   Joined               Name
>>    1   M    376   2008-07-09 12:30:32  piglet1
>>        Addresses:    2   M    368   2008-07-09 12:30:31 
>>  piglet2
>>        Addresses:    3   M    380   2008-07-09 12:30:33 
>>  piglet3
>>        Addresses:    4   M    372   2008-07-09 12:30:31 
>>  piglet4
>>        Addresses: 
>> These addresses are correct (and are the same addresses that show up in the
>> packet trace).
>> I must be overlooking something very obvious....
> Hmm, very odd.
> Are those IP addresses consistent across all nodes in the cluster ?

Yes, "cman_tool nodes -a" gives the same IP addresses no matter which of
the four cluster nodes it's run on.


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