[Sheepdog] Configuring simple cluster on CentOS 5.5 x86_64

[MORITA Kazutaka]

At Fri, 15 Oct 2010 13:38:16 +0300,
Yuriy Kohut wrote:
> 
> Hi,
> 
> I'm using the following 'Getting Started' guide to configure simple cluster:
> http://www.osrg.net/sheepdog/usage.html
> 
> I have configured cluster on 1 node/box, so the first questions are:
> Can I configure cluster on single node (1 box) under CentOS 5.5 x86_64 ? 
> Is it required at least 3 nodes/boxes ... ?
> 
> I have faced with the following issue on my single-node cluster. I have rebooted the box after my first image creation. The following done for that:
> - corosync is up and running
> udp        0      0 192.168.128.195:5404        0.0.0.0:*                               3541/corosync       
> udp        0      0 192.168.128.195:5405        0.0.0.0:*                               3541/corosync       
> udp        0      0 226.94.1.1:5405             0.0.0.0:*                               3541/corosync 
> 
> - sheep is up and running
> tcp        0      0 0.0.0.0:7000                0.0.0.0:*                   LISTEN      3561/sheep
> 
> - cluster is formatted with 1 copy only
> #collie cluster format --copies=1
> 
> - the image with prelocated data is created
> # qemu-img create sheepdog:test0 -o preallocation=data 4G
> 
> 
> So after such siple steps I got:
> # collie vdi list
>   name        id    size    used  shared    creation time   vdi id
> ------------------------------------------------------------------
>   test0        1  4.0 GB  4.0 GB  0.0 MB 2010-10-15 12:42   fd34af
> 
> 
> Then I rebooted the box, and no image(s) are available for me after box came back. The vdi list just show nothing:
> # collie vdi list
>   name        id    size    used  shared    creation time   vdi id
> ------------------------------------------------------------------
> 
> and 'collie vdi list' never ends ...
> corosync and sheep are still running.
> 
> 
> Could somebody assist me with that.

Sorry, the following patch will fixes the problem.

=
From: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
Subject: [PATCH] sheep: call start_recovery when cluster restarts with one node

Sheepdog recovers objects before starting a storage service, and the
routine is called when nodes are joined.  However If sheepdog consists
of only one node, no node doesn't send join messages, so
start_recovery doesn't called.  This patch fixes the problem.

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 sheep/group.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/sheep/group.c b/sheep/group.c
index ba8cdfb..86cbdb8 100644
--- a/sheep/group.c
+++ b/sheep/group.c
@@ -1226,6 +1226,9 @@ static void __sd_confchg_done(struct cpg_event *cevent)
 
 		update_cluster_info(&msg);
 
+		if (sys->status == SD_STATUS_OK) /* sheepdog starts with one node */
+			start_recovery(sys->epoch, NULL, 0);
+
 		return;
 	}
 
-- 
1.5.6.5