On Thu, Jul 2, 2015 at 10:52 AM, Krishnan Parthasarathi <kparthas@xxxxxxxxxx> wrote:
> >
> > A port assigned by Glusterd for a brick is found to be in use already by
> > the brick. Any changes in Glusterd recently which can cause this?
> >
> > Or is it a test infra problem?
This issue is likely to be caused by http://review.gluster.org/11039
This patch changes the port allocation that happens for rpc_clnt based
connections. Previously, ports allocated where < 1024. With this change,
these connections, typically mount process, gluster-nfs server processes
etc could end up using ports that bricks are being assigned to.
IIUC, the intention of the patch was to make server processes lenient to
inbound messages from ports > 1024. If we don't require to use ports > 1024
we could leave the port allocation for rpc_clnt connections as before.
Alternately, we could reserve the range of ports starting from 49152 for bricks
by setting net.ipv4.ip_local_reserved_ports using sysctl(8). This is specific to Linux.
I'm not aware of how this could be done in NetBSD for instance though.
It seems this is exactly whats happening.
I have a question, I get the following data from netstat and grep
tcp 0 0 f6be17c0fbf5:1023 f6be17c0fbf5:24007 ESTABLISHED 31516/glusterfsd
tcp 0 0 f6be17c0fbf5:49152 f6be17c0fbf5:490 ESTABLISHED 31516/glusterfsd
unix 3 [ ] STREAM CONNECTED 988353 31516/glusterfsd /var/run/gluster/4878d6e905c5f6032140a00cc584df8a.socket
Here 31516 is the brick pid.
Looking at the data, line 2 is very clear, it shows connection between brick and glusterfs client.
unix socket on line 3 is also clear, it is the unix socket connection that glusterd and brick process use for communication.
I am not able to understand line 1; which part of brick process established a tcp connection with glusterd using port 1023?
Note: this data is from a build which does not have the above mentioned patch.
Raghavendra Talur
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