[Gluster-users] Changing the server hostname

[Franco Broi]

Just an update on this.

I grabbed the system disk from the failed upgrade and had a careful look
through the /var/lib/glusterd files and it looks like I might have
missed changing the hostname in one of them.

Seems like to change the hostname you need to grep all instances and
rename a few files, I tested this theory with a spare server and it
seems to work.

grep -nr nas /var/lib/glusterd
find /var/lib/glusterd/vols/*/bricks | grep nas

I didn't change the names of the .vol files or the files in run/, but
glusterd seemed to start ok, should I change these also?

It's a shame the glisterd error log couldn't be a little more helpful,
just saying unknown key means nothing to me.

I will have to wait for another maintenance window to try again to
upgrade my servers, just not sure if I can stand the stress levels!!

Cheers,

On Tue, 2014-01-07 at 13:29 +0800, Franco Broi wrote: 
> The hostname of the machine didn't actually change but the interface
> that I wanted to export the filesystem over did. I went through all the
> files in /var/lib/glusterd changing all instances of the hostname to the
> hostname of the interface, ie;
> 
> hostname was nas1
> new interface is nas1-10g
> 
> Same thing happened when I tried to start glusterd. I ran glusterd
> -debug and searched the log for anything obvious but couldn't find
> anything.
> 
> I eventually got desperate and reverted everything and it's back up and
> running.
> 
> The new system was using a newer version of gluster, glusterfs 3.4.1 the
> old one is  3.4.0, could that have something to do with it?
> 
> I've got 2 new servers I want to add to the system, these are running
> the newer version of gluster so I thought it best to upgrade the old
> server before doing that.
> 
> Cheers,
> 
> 
> On Tue, 2014-01-07 at 10:46 +0530, Vijay Bellur wrote: 
> > On 01/07/2014 09:05 AM, Franco Broi wrote:
> > >
> > > What are the steps to change a server's hostname? The documentation
> > > appears to have a broken link to the article in Gluster 3.2: Brick
> > > Restoration - Replace Crashed Server
> > >
> > > I have rebuilt my 2 gluster servers and restored the files
> > > in /var/lib/glusterd but I can't start gluster, I assume because I have
> > > changed the IP address.
> > >
> > > All I get in my log file is this:
> > >
> > > [2014-01-07 03:08:53.771575] E [rpc-transport.c:253:rpc_transport_load] 0-rpc-transport: /usr/lib64/glusterfs/3.4.1/rpc-transport/rdma.so: cannot open shared object file: No such file or directory
> > > [2014-01-07 03:08:53.771605] W [rpc-transport.c:257:rpc_transport_load] 0-rpc-transport: volume 'rdma.management': transport-type 'rdma' is not valid or not found on this machine
> > > [2014-01-07 03:08:53.771615] W [rpcsvc.c:1389:rpcsvc_transport_create] 0-rpc-service: cannot create listener, initing the transport failed
> > > [2014-01-07 03:08:53.810098] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-0
> > > [2014-01-07 03:08:53.810122] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-1
> > > [2014-01-07 03:08:53.810132] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-2
> > > [2014-01-07 03:08:53.810141] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-3
> > > [2014-01-07 03:08:53.810149] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-4
> > > [2014-01-07 03:08:53.810158] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-5
> > > [2014-01-07 03:08:53.810167] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-6
> > > [2014-01-07 03:08:53.810175] E [glusterd-store.c:1858:glusterd_store_retrieve_volume] 0-: Unknown key: brick-7
> > > [2014-01-07 03:08:54.201857] E [glusterd-store.c:2487:glusterd_resolve_all_bricks] 0-glusterd: resolve brick failed in restore
> > 
> > This seems to point to a failure in identifying a previously know brick 
> > during glusterd start. It might be worthwhile to check 
> > /var/lib/glusterd/vols/<volname>/bricks to see if it contains the old IP 
> > address/hostname.
> > 
> > -Vijay
> 
> 
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