nfs-kernel-server在Ubuntu中保持失败

我试图在Ubuntu 14.04中严格按照本教程创buildNFS共享: https : //help.ubuntu.com/community/SettingUpNFSHowTo 。

root@srv:~# service nfs-kernel-server start * Exporting directories for NFS kernel daemon... [ OK ] * Starting NFS kernel daemon [fail] 

在syslog中可以看到以下内容:

 Feb 5 14:22:53 srv kernel: [37884.636698] nfsd: last server has exited, flushing export cache Feb 5 14:22:54 srv kernel: [37885.684132] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory Feb 5 14:22:54 srv kernel: [37885.684146] NFSD: starting 90-second grace period (net ffffffff81cd3700) Feb 5 14:22:54 srv rpc.mountd[14901]: mountd: could not create listeners 

如何find原因并成功运行NFS服务器?