[Linux-cluster] gfs2, kvm setup

J. Bruce Fields bfields at fieldses.org
Wed Jul 9 16:32:22 UTC 2008

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
   2   M    368   2008-07-09 12:30:31  piglet2
   3   M    380   2008-07-09 12:30:33  piglet3
   4   M    372   2008-07-09 12:30:31  piglet4

These addresses are correct (and are the same addresses that show up in the
packet trace).

I must be overlooking something very obvious....


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