I set up a swift cluster with 5 physical nodes. One node for swift proxy and keystone, the rest 4 are storage nodes. I followed the instruction for Ubuntu 12.04 and Grizzly, after configured the storage node, I ran the command

service swift-object start

I got

"failed to start swift-object"

I checked syslog, I saw

init: swift-object post-stop process (13734) terminated with status 1

The ring files are at /etc/swift on each single storage nodes and swift proxy server as well.

what could go wrong?

thanks