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Re: [Linux-cluster] gfs2, kvm setup



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. It's got a connection from an IP address that is not known to cman. So it closes it as a spoofer.

You'll need to check the routing of the interfaces. The most common cause of this sort of error is having two interfaces on the same physical (or internal) network.

--

Chrissie


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