以下是我目前已采取的步骤：
server01 # apt-get install nfs-kernel-server
server01 # mkdir /home/acoder/Public
server01 # vi /etc/fstab
当我使用 grep 命令查找“mount”时，我发现了一些有用的信息：
/var/log/syslog:Dec 17 13:57:58 server01 rpc.mountd[9918]: Version 1.2.8 starting
/var/log/syslog:Dec 17 14:04:55 server01 rpc.mountd[9918]: refused mount request from 1.2.3.77 for /public/ (/public): unmatched host
/var/log/syslog:Dec 17 14:49:44 server01 rpc.mountd[9918]: message repeated 8 times: [ refused mount request from 1.2.3.77 for /public/ (/public): unmatched host]
/var/log/syslog:Dec 17 14:51:49 server01 rpc.mountd[9918]: Caught signal 15, un-registering and exiting.
/var/log/syslog:Dec 17 14:51:50 server01 rpc.mountd[18437]: Version 1.2.8 starting
/var/log/syslog:Dec 17 14:52:00 server01 rpc.mountd[18437]: refused mount request from 1.2.3.77 for /public/ (/public): unmatched host
/var/log/syslog:Dec 17 14:53:32 server01 rpc.mountd[18437]: message repeated 2 times: [ refused mount request from 1.2.3.77 for /public/ (/public): unmatched host]
/var/log/syslog:Dec 17 15:48:17 server01 rpc.mountd[18437]: refused mount request from 1.2.3.77 for /export/public (/export/public): unmatched host
以下是showmount -e 1.2.3.4客户端的输出：
Export list for 1.2.3.4:
/export/public 192.168.1.0/24
/export 192.168.1.0/24
我发现当我尝试在服务器本身上挂载 nfs 共享时也会被拒绝访问：
\# mount -t nfs -o proto=tcp,port=2049 localhost:/export/public/ /mnt/server01public/
mount.nfs: access denied by server while mounting localhost:/export/public/
# added the following line
/home/acoder/Public /export/public none bind 0 0
server01 # ifconfig
eth0 Link encap:Ethernet HWaddr d0:67:e5:3f:fa:82
inet addr:1.2.3.4 Bcast:1.2.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:53009 errors:0 dropped:0 overruns:0 frame:0
TX packets:32395 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:39888803 (39.8 MB) TX bytes:4382214 (4.3 MB)
Interrupt:20 Memory:e3900000-e3920000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:23485 errors:0 dropped:0 overruns:0 frame:0
TX packets:23485 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2612596 (2.6 MB) TX bytes:2612596 (2.6 MB)
server01 # vi /etc/exports
# added the following lines
/export 192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)
/export/public 192.168.1.0/24(rw,nohide,insecure,no_subtree_check,async,no_root_squash)
server01 # mkdir -p /export/public
server01 # chmod 777 /export/
server01 # chmod 777 /export/public/
server01 # exportfs -a
server01 # service nfs-kernel-server restart
server01 # showmount -e
Export list for server01:
/export/public 192.168.1.0/24
/export 192.168.1.0/24
现在对于客户来说：
client01 # mkdir /mnt/server01public
client01 # mount -t nfs -o proto=tcp,port=2049 1.2.3.4:/public/ /mnt/server01public/
mount.nfs: access denied by server while mounting 1.2.3.4:/public/
我已经关闭了服务器防火墙（它位于我的本地家庭网络中），但仍然出现同样的错误。
0 我错过了什么？
编辑1
我发现当我尝试在服务器本身上挂载 nfs 共享时也会被拒绝访问：
\# mount -t nfs -o proto=tcp,port=2049 localhost:/export/public/ /mnt/server01public/
mount.nfs: access denied by server while mounting localhost:/export/public/
编辑2
当我在 /var/log/* 中搜索“mount”时，我发现了一些有用的信息：
/var/log/syslog:Dec 17 13:57:58 server01 rpc.mountd[9918]: Version 1.2.8 starting
/var/log/syslog:Dec 17 14:04:55 server01 rpc.mountd[9918]: refused mount request from 1.2.3.77 for /public/ (/public): unmatched host
/var/log/syslog:Dec 17 14:49:44 server01 rpc.mountd[9918]: message repeated 8 times: [ refused mount request from 1.2.3.77 for /public/ (/public): unmatched host]
/var/log/syslog:Dec 17 14:51:49 server01 rpc.mountd[9918]: Caught signal 15, un-registering and exiting.
/var/log/syslog:Dec 17 14:51:50 server01 rpc.mountd[18437]: Version 1.2.8 starting
/var/log/syslog:Dec 17 14:52:00 server01 rpc.mountd[18437]: refused mount request from 1.2.3.77 for /public/ (/public): unmatched host
/var/log/syslog:Dec 17 14:53:32 server01 rpc.mountd[18437]: message repeated 2 times: [ refused mount request from 1.2.3.77 for /public/ (/public): unmatched host]
/var/log/syslog:Dec 17 15:48:17 server01 rpc.mountd[18437]: refused mount request from 1.2.3.77 for /export/public (/export/public): unmatched host
1.2.3.77是客户端。
编辑3
server01 / # cat /etc/hosts.allow
# /etc/hosts.allow: list of hosts that are allowed to access the system.
# See the manual pages hosts_access(5) and hosts_options(5).
#
# Example: ALL: LOCAL @some_netgroup
# ALL: .foobar.edu EXCEPT terminalserver.foobar.edu
#
# If you're going to protect the portmapper use the name "rpcbind" for the
# daemon name. See rpcbind(8) and rpc.mountd(8) for further information.
#
server01 / # cat /etc/hosts.deny
# /etc/hosts.deny: list of hosts that are _not_ allowed to access the system.
# See the manual pages hosts_access(5) and hosts_options(5).
#
# Example: ALL: some.host.name, .some.domain
# ALL EXCEPT in.fingerd: other.host.name, .other.domain
#
# If you're going to protect the portmapper use the name "rpcbind" for the
# daemon name. See rpcbind(8) and rpc.mountd(8) for further information.
#
# The PARANOID wildcard matches any host whose name does not match its
# address.
#
# You may wish to enable this to ensure any programs that don't
# validate looked up hostnames still leave understandable logs. In past
# versions of Debian this has been the default.
# ALL: PARANOID
server01 / #
答案1
解决了。
编辑 /etc/exports 并添加客户端机器的具体 IP：
# added the following lines
/export 1.2.3.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)
/export/public 1.2.3.0/24(rw,nohide,insecure,no_subtree_check,async,no_root_squash)
发出 exportfs -a，并且能够从客户端挂载。