root@hipchat:~# mount -t nfs 192.168.10.220:/hipchat/share /home/share/nfs
mount.nfs: access denied by server while mounting 192.168.10.220:/hipchat/share
# 原因: 在服务器Oracle Linux 6.8的系统下使用的是NFSv4，在/var/log/messages中能看到nfs启动时的日志输出:
Feb 19 11:23:07 localhost rpc.mountd[19234]: Version 1.2.3 starting
Feb 19 11:23:07 localhost kernel: [34923.990353] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
Feb 19 11:23:07 localhost kernel: [34923.990369] NFSD: starting 90-second grace period (net ffffffff81b8b040)
# 使用NFSv4时，在nfs服务端做如下操作:
[root@localhost ~]# vim /etc/sysconfig/nfs
# Optional arguments passed to rpc.nfsd. See rpc.nfsd(8)
# Turn off v2 and v3 protocol support
RPCNFSDARGS="-N 2 -N 3"
# Turn off v4 protocol support
RPCNFSDARGS="-N 4"
[root@localhost ~]# service nfs restart
