问fc6下nfs配置问题

topology

按照配置步骤一步一步做了，都挺顺利的，可是cat /var/log/messages却看到一些配置没有成功，下面是日志文件里的一些信息，高手帮忙看看怎么回事阿。谢了阿

Aug 28 20:56:03 localhost mountd[4422]: Caught signal 15, un-registering and exiting.
Aug 28 20:56:04 localhost kernel: nfsd: last server has exited
Aug 28 20:56:04 localhost kernel: nfsd: unexporting all filesystems
Aug 28 20:56:04 localhost kernel: RPC: failed to contact portmap (errno -5).
Aug 28 20:56:23 localhost nfsd[4581]: nfssvc: writting fds to kernel failed: errno 0 (Success)
Aug 28 20:56:23 localhost nfsd[4581]: nfssvc: writting fds to kernel failed: errno 0 (Success)
Aug 28 20:56:23 localhost kernel: NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
Aug 28 20:56:23 localhost kernel: NFSD: starting 90-second grace period