此错误发生的一种解决办法：
更新文件 /etc/exports和/etc/hosts.allow，加入对应网段：
/etc/exports:
/rootfs *(rw,no_root_squash,sync,insecure)
/etc/hosts.allow:
portmap mountd nfsd statd lockd rquotad : 192.168.1.*, 192.168.2.*
其他的一些设置：
mount -t nfs -o nfsvers=3
mount -t nfs -o nfsvers=2
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