[[email protected] /]# cat /etc/redhat-release #########查看系统
CentOS release 6.5 (Final)
[[email protected] /]# uname -m #########查看系统是32位还是64位。这里是64位
x86_64
[[email protected] /]# uname -r #########查看内核版本
2.6.32-431.el6.x86_64
[[email protected] /]# rpm -aq nfs-utils portmap rpcbind #########检查系统是否安装nfs portmap rpcbind
[[email protected] /]# yum grouplist #########查看可能批量安装哪些列表。扩展：yum grouplist 列出所有可安装的软件包
Loaded plugins: fastestmirror, security
Setting up Group Process
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
base | 3.7 kB 00:05
http://mirrors.163.com/centos/6.8/extras/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.163.com/centos/6.8/extras/x86_64/repodata/repomd.xml: (28, ‘Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds‘)
Trying other mirror.
extras | 3.4 kB 00:00
extras/primary_db | 37 kB 00:00
updates | 3.4 kB 00:00
updates/primary_db | 748 kB 00:00
base/group_gz | 226 kB 00:00
Installed Groups:
Base
Compatibility libraries
Debugging Tools
Development tools
Dial-up Networking Support
E-mail server
Fonts
Graphical Administration Tools
Hardware monitoring utilities
Legacy UNIX compatibility
Networking Tools
Performance Tools
Perl Support
Scientific support
Security Tools
Web Server
Installed Language Groups:
Arabic Support [ar]
Armenian Support [hy]
Georgian Support [ka]
Hebrew Support [he]
Inuktitut Support [iu]
Lao Support [lo]
Tajik Support [tg]
Available Groups:
Additional Development
Backup Client
Backup Server
CIFS file server
Client management tools
Console internet tools
Desktop
Desktop Debugging and Performance Tools
Desktop Platform
Desktop Platform Development
Directory Client
Directory Server
Eclipse
Emacs
FCoE Storage Client
FTP server
General Purpose Desktop
Graphics Creation Tools
Guest Agents
High Availability
High Availability Management
Identity Management Server
Infiniband Support
Input Methods
Internet Applications
Internet Browser
Java Platform
KDE Desktop
Large Systems Performance
Legacy X Window System compatibility
Load Balancer
Mainframe Access
Messaging Client Support
MySQL Database client
MySQL Database server
NFS file server
Network Infrastructure Server
Network Storage Server
Network file system client
Office Suite and Productivity
PHP Support
PostgreSQL Database client
PostgreSQL Database server
Print Server
Printing client
Remote Desktop Clients
Resilient Storage
Ruby Support
SNMP Support
Scalable Filesystems
Server Platform
Server Platform Development
Smart card support
Storage Availability Tools
System Management
System administration tools
TeX support
Technical Writing
TurboGears application framework
Virtualization
Virtualization Client
Virtualization Platform
Virtualization Tools
Web Servlet Engine
Web-Based Enterprise Management
X Window System
iSCSI Storage Client
Available Language Groups:
Afrikaans Support [af]
Albanian Support [sq]
Amazigh Support [ber]
Assamese Support [as]
Azerbaijani Support [az]
Basque Support [eu]
Belarusian Support [be]
Bengali Support [bn]
Bhutanese Support [dz]
Brazilian Portuguese Support [pt_BR]
Breton Support [br]
Bulgarian Support [bg]
Catalan Support [ca]
Chhattisgarhi Support [hne]
Chichewa Support [ny]
Chinese Support [zh]
Coptic Support [cop]
Croatian Support [hr]
Czech Support [cs]
Danish Support [da]
Dutch Support [nl]
English (UK) Support [en_GB]
Esperanto Support [eo]
Estonian Support [et]
Ethiopic Support [am]
Faroese Support [fo]
Fijian Support [fj]
Filipino Support [fil]
Finnish Support [fi]
French Support [fr]
Frisian Support [fy]
Friulian Support [fur]
Gaelic Support [gd]
Galician Support [gl]
German Support [de]
Greek Support [el]
Gujarati Support [gu]
Hiligaynon Support [hil]
Hindi Support [hi]
Hungarian Support [hu]
Icelandic Support [is]
Indonesian Support [id]
Interlingua Support [ia]
Irish Support [ga]
Italian Support [it]
Japanese Support [ja]
Kannada Support [kn]
Kashmiri Support [ks]
Kashubian Support [csb]
Kazakh Support [kk]
Khmer Support [km]
Kinyarwanda Support [rw]
Konkani Support [kok]
Korean Support [ko]
Kurdish Support [ku]
Latin Support [la]
Latvian Support [lv]
Lithuanian Support [lt]
Low Saxon Support [nds]
Luxembourgish Support [lb]
Macedonian Support [mk]
Maithili Support [mai]
Malagasy Support [mg]
Malay Support [ms]
Malayalam Support [ml]
Maltese Support [mt]
Manx Support [gv]
Maori Support [mi]
Marathi Support [mr]
Mongolian Support [mn]
Myanmar (Burmese) Support [my]
Nepali Support [ne]
Northern Sotho Support [nso]
Norwegian Support [nb]
Occitan Support [oc]
Oriya Support [or]
Persian Support [fa]
Polish Support [pl]
Portuguese Support [pt]
Punjabi Support [pa]
Romanian Support [ro]
Russian Support [ru]
Sanskrit Support [sa]
Sardinian Support [sc]
Serbian Support [sr]
Sindhi Support [sd]
Sinhala Support [si]
Slovak Support [sk]
Slovenian Support [sl]
Somali Support [so]
Southern Ndebele Support [nr]
Southern Sotho Support [st]
Spanish Support [es]
Swahili Support [sw]
Swati Support [ss]
Swedish Support [sv]
Tagalog Support [tl]
Tamil Support [ta]
Telugu Support [te]
Tetum Support [tet]
Thai Support [th]
Tibetan Support [bo]
Tsonga Support [ts]
Tswana Support [tn]
Turkish Support [tr]
Turkmen Support [tk]
Ukrainian Support [uk]
Upper Sorbian Support [hsb]
Urdu Support [ur]
Uzbek Support [uz]
Venda Support [ve]
Vietnamese Support [vi]
Walloon Support [wa]
Welsh Support [cy]
Xhosa Support [xh]
Zulu Support [zu]
Done
[[email protected] /]# yum groupinstall "NFS file server" -y
#########安装NFS。
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
Setting up Group Process
Checking for new repos for mirrors
Resolving Dependencies
--> Running transaction check
---> Package nfs-utils.x86_64 1:1.2.3-70.el6 will be installed
--> Processing Dependency: nfs-utils-lib >= 1.1.0-3 for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libtirpc >= 0.2.1-11 for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: keyutils >= 1.4-4 for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: rpcbind for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: python-argparse for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libgssglue.so.1(libgssapi_CITI_2)(64bit) for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libgssglue for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libevent for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libtirpc.so.1()(64bit) for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libnfsidmap.so.0()(64bit) for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libgssglue.so.1()(64bit) for package: 1:nfs-utils-1.2.3-70.el6.x86_64
--> Processing Dependency: libevent-1.4.so.2()(64bit) for package: 1:nfs-utils-1.2.3-70.el6.x86_64
---> Package nfs4-acl-tools.x86_64 0:0.3.3-8.el6 will be installed
--> Running transaction check
---> Package keyutils.x86_64 0:1.4-5.el6 will be installed
--> Processing Dependency: keyutils-libs = 1.4-5.el6 for package: keyutils-1.4-5.el6.x86_64
---> Package libevent.x86_64 0:1.4.13-4.el6 will be installed
---> Package libgssglue.x86_64 0:0.1-11.el6 will be installed
---> Package libtirpc.x86_64 0:0.2.1-11.el6 will be installed
---> Package nfs-utils-lib.x86_64 0:1.1.5-11.el6 will be installed
---> Package python-argparse.noarch 0:1.2.1-2.1.el6 will be installed
---> Package rpcbind.x86_64 0:0.2.0-12.el6 will be installed
--> Running transaction check
---> Package keyutils-libs.x86_64 0:1.4-4.el6 will be updated
---> Package keyutils-libs.x86_64 0:1.4-5.el6 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
===========================================================
Package Arch Version Repository
Size
===========================================================
Installing:
nfs-utils x86_64 1:1.2.3-70.el6 base 334 k
nfs4-acl-tools x86_64 0.3.3-8.el6 base 43 k
Installing for dependencies:
keyutils x86_64 1.4-5.el6 base 39 k
libevent x86_64 1.4.13-4.el6 base 66 k
libgssglue x86_64 0.1-11.el6 base 23 k
libtirpc x86_64 0.2.1-11.el6 base 82 k
nfs-utils-lib x86_64 1.1.5-11.el6 base 68 k
python-argparse noarch 1.2.1-2.1.el6 base 48 k
rpcbind x86_64 0.2.0-12.el6 base 51 k
Updating for dependencies:
keyutils-libs x86_64 1.4-5.el6 base 20 k
Transaction Summary
===========================================================
Install 9 Package(s)
Upgrade 1 Package(s)
Total download size: 774 k
Downloading Packages:
(1/10): keyutils-1.4-5.el6.x86_64.r | 39 kB 00:00
(2/10): keyutils-libs-1.4-5.el6.x86 | 20 kB 00:00
(3/10): libevent-1.4.13-4.el6.x86_6 | 66 kB 00:00
(4/10): libgssglue-0.1-11.el6.x86_6 | 23 kB 00:00
(5/10): libtirpc-0.2.1-11.el6.x86_6 | 82 kB 00:00
(6/10): nfs-utils-1.2.3-70.el6.x86_ | 334 kB 00:00
(7/10): nfs-utils-lib-1.1.5-11.el6. | 68 kB 00:00
(8/10): nfs4-acl-tools-0.3.3-8.el6. | 43 kB 00:00
(9/10): python-argparse-1.2.1-2.1.e | 48 kB 00:00
(10/10): rpcbind-0.2.0-12.el6.x86_6 | 51 kB 00:00
-----------------------------------------------------------
Total 184 kB/s | 774 kB 00:04
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : libgssglue-0.1-11.el6.x86_64 1/11
Installing : libtirpc-0.2.1-11.el6.x86_64 2/11
Updating : keyutils-libs-1.4-5.el6.x86_64 3/11
Installing : keyutils-1.4-5.el6.x86_64 4/11
Installing : rpcbind-0.2.0-12.el6.x86_64 5/11
Installing : python-argparse-1.2.1-2.1.el6.noarc 6/11
Installing : libevent-1.4.13-4.el6.x86_64 7/11
Installing : nfs-utils-lib-1.1.5-11.el6.x86_64 8/11
Installing : 1:nfs-utils-1.2.3-70.el6.x86_64 9/11
Installing : nfs4-acl-tools-0.3.3-8.el6.x86_64 10/11
Cleanup : keyutils-libs-1.4-4.el6.x86_64 11/11
Verifying : keyutils-libs-1.4-5.el6.x86_64 1/11
Verifying : libevent-1.4.13-4.el6.x86_64 2/11
Verifying : 1:nfs-utils-1.2.3-70.el6.x86_64 3/11
Verifying : keyutils-1.4-5.el6.x86_64 4/11
Verifying : rpcbind-0.2.0-12.el6.x86_64 5/11
Verifying : nfs-utils-lib-1.1.5-11.el6.x86_64 6/11
Verifying : libgssglue-0.1-11.el6.x86_64 7/11
Verifying : nfs4-acl-tools-0.3.3-8.el6.x86_64 8/11
Verifying : libtirpc-0.2.1-11.el6.x86_64 9/11
Verifying : python-argparse-1.2.1-2.1.el6.noarc 10/11
Verifying : keyutils-libs-1.4-4.el6.x86_64 11/11
Installed:
nfs-utils.x86_64 1:1.2.3-70.el6
nfs4-acl-tools.x86_64 0:0.3.3-8.el6
Dependency Installed:
keyutils.x86_64 0:1.4-5.el6
libevent.x86_64 0:1.4.13-4.el6
libgssglue.x86_64 0:0.1-11.el6
libtirpc.x86_64 0:0.2.1-11.el6
nfs-utils-lib.x86_64 0:1.1.5-11.el6
python-argparse.noarch 0:1.2.1-2.1.el6
rpcbind.x86_64 0:0.2.0-12.el6
Dependency Updated:
keyutils-libs.x86_64 0:1.4-5.el6
Complete!
[[email protected] /]# rpm -aq nfs-utils portmap rpcbind
rpcbind-0.2.0-12.el6.x86_64
nfs-utils-1.2.3-70.el6.x86_64
[[email protected] /]# /etc/init.d/rpcbind start
Starting rpcbind: [ OK ]
[[email protected] /]# ps -ef|grep rpc
rpc 2802 1 0 08:35 ? 00:00:00 rpcbind
root 2806 1490 0 08:36 pts/0 00:00:00 grep --color=auto rpc
[[email protected] /]#
[[email protected] /]#
[[email protected] /]# /etc/init.d/rpcbind status
rpcbind (pid 2802) is running...
[[email protected] /]# rpcinfo -p localhost（本机的地址） ####查看中介有没有房源（形象的比方） ，就是查看本机有没有房源
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper ####综上都没房源。对外用111端口
[[email protected] /]# /etc/init.d/rpcbind stop
Stopping rpcbind: [ OK ]
[[email protected] /]# rpcinfo -p localhost
rpcinfo: can‘t contact portmapper: RPC: Remote system error - Connection refused #######rpc服务没有开。主机这个报错==>>这是自己测试
[[email protected] /]# /etc/init.d/rpcbind start
Starting rpcbind: [ OK ]
[[email protected] /]# rpcinfo -p localhost
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
[[email protected] /]# /etc/init.d/nfs start 启动nfs服务
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS mountd: [ OK ]
Starting NFS daemon: [ OK ]
Starting RPC idmapd: [ OK ]
[[email protected] /]# rpcinfo -p localhost #####启动rpc服务之后出现端口
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100011 1 udp 875 rquotad
100011 2 udp 875 rquotad
100011 1 tcp 875 rquotad
100011 2 tcp 875 rquotad
100005 1 udp 48811 mountd
100005 1 tcp 46451 mountd
100005 2 udp 50017 mountd
100005 2 tcp 59534 mountd
100005 3 udp 52072 mountd
100005 3 tcp 43258 mountd
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100227 2 tcp 2049 nfs_acl
100227 3 tcp 2049 nfs_acl
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100227 2 udp 2049 nfs_acl
100227 3 udp 2049 nfs_acl
100021 1 udp 48251 nlockmgr
100021 3 udp 48251 nlockmgr
100021 4 udp 48251 nlockmgr
100021 1 tcp 34676 nlockmgr
100021 3 tcp 34676 nlockmgr
100021 4 tcp 34676 nlockmgr
[[email protected] /]# chkconfig nfs on ###自启动
[[email protected] /]# chkconfig rpcbind on
[[email protected] /]# chkconfig --list nfs ###检查
nfs 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[[email protected] /]# chkconfig --list rpcbind ###检查
rpcbind 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[[email protected] /]# more /etc/init.d/nfs ###看脚本，主要看rpc和nfs服务启停的时间
#!/bin/sh
#
# nfs This shell script takes care of starting and stopping
# the NFS services.
#
#
# description: NFS is a popular protocol for file sharing across networks.
# This service provides NFS server functionality, which is \
# configured via the /etc/exports file.
# probe: true
# config: /etc/sysconfig/nfs
### BEGIN INIT INFO
# Provides: nfs
# Required-Start: $local_fs $network $syslog $rpcbind
[[email protected] /]# more /etc/init.d/rcpbind
/etc/init.d/rcpbind: No such file or directory
[[email protected] /]# more /etc/init.d/rpcbind
#! /bin/sh
#
# rpcbind Start/Stop RPCbind
#
# chkconfig: 2345 13 87
# description: The rpcbind utility is a server that converts RPC program \
# numbers into universal addresses. It must be running on the
\
# host to be able to make RPC calls on a server on that machi
ne.
#
# processname: rpcbind
# probe: true
# config: /etc/sysconfig/rpcbind
# This is an interactive program, we need the current locale
[ -f /etc/profile.d/lang.sh ] && . /etc/profile.d/lang.sh
# We can‘t Japanese on normal console at boot time, so force LANG=C.
if [ "$LANG" = "ja" -o "$LANG" = "ja_JP.eucJP" ]; then
[[email protected] /]# ll /etc/exports ### nfs 的配置文件
-rw-r--r--. 1 root root 0 Jan 12 2010 /etc/exports
[[email protected] /]# cat /etc/exports ### 配置文件默认为空
[[email protected] /]# mkdir /data ###创建共享目录
mkdir: cannot create directory `/data‘: File exists ###已经存在
[[email protected] /]# ll /data/
total 16
-rw-r--r--. 1 root root 111 Jun 20 06:54 html_2016-06-20.tar.gz
-rw-r--r--. 1 root root 156 Jun 24 07:41 www_2016-06-24.tar.ga
-rw-r--r--. 1 root root 156 Jun 25 02:00 www_2016-06-25.tar.ga
-rw-r--r--. 1 root root 111 Jun 24 07:20 www_bak_5.tar.ga
[[email protected] /]# vim /etc/exports
#shared data for bbs by zhang at 2016627 == >>不要忘记写注释
/data 10.0.0.0/24(rw,sync) ###r读 w写 ro只读
~ sync是写到磁盘，如果是async那就是写到缓存
~
"/etc/exports" 2L, 68C written
[[email protected] /]# cat /etc/exports
#shared data for bbs by zhang at 2016627
/data 10.0.0.0/24(rw,sync)
[[email protected] /]# /etc/init.d/nfs reload（别用restart重启，要用此：平滑重启） #####重启服务
[[email protected] /]# vim/etc/init.d/nfs ==>>nfs的脚本，进去/reload.
#!/bin/sh
#
# nfs This shell script takes care of starting and stopping
# the NFS services.
#
# chkconfig: - 30 60
# description: NFS is a popular protocol for file sharing across netw
orks.
# This service provides NFS server functionality, which
is \
# configured via the /etc/exports file.
# probe: true
# config: /etc/sysconfig/nfs
### BEGIN INIT INFO
# Provides: nfs
# Required-Start: $local_fs $network $syslog $rpcbind
# Required-Stop: $local_fs $network $syslog $rpcbind
:/res
rval=$?
[ $RETVAL -eq 0 ] && RETVAL=$rval
if [ -n "$RQUOTAD" -a "$RQUOTAD" != "no" ]; then
status rpc.rquotad
rval=$?
[ $RETVAL -eq 0 ] && RETVAL=$rval
fi
;;
restart)
$0 stop
$0 start
;;
reload | force-reload)
/usr/sbin/exportfs -r
[ -f /var/lock/subsys/nfs ] && touch /var/lock/subsys/nfs
;;
probe)
if [ ! -f /var/lock/subsys/nfs ] ; then
[[email protected] /]#
[[email protected] /]#
[[email protected] /]# /etc/init.d/nfs reload == exportfs -r ###可以认为等价
[[email protected] /]# showmount -e localhost ########先在本机检查，然后客户端检查。-e：显示NFS服务器的输出清单
Export list for localhost:
/data 10.0.0.0/24
[[email protected] /]#
=======================================================
接下来就是分别server和client上测试：
[[email protected] /]# cd /data
[[email protected] data]# ll
total 16
-rw-r--r--. 1 nfsnobody root 111 Jun 20 06:54 html_2016-06-20.tar.gz
-rw-r--r--. 1 nfsnobody root 156 Jun 24 07:41 www_2016-06-24.tar.ga
-rw-r--r--. 1 nfsnobody root 156 Jun 25 02:00 www_2016-06-25.tar.ga
-rw-r--r--. 1 nfsnobody root 111 Jun 24 07:20 www_bak_5.tar.ga
[[email protected] data]# rm html_2016-06-20.tar.gz
rm: remove regular file `html_2016-06-20.tar.gz‘? y
[[email protected] data]# ll
total 12
-rw-r--r--. 1 nfsnobody nfsnobody 0 Jun 26 01:00 ddd
-rw-r--r--. 1 nfsnobody root 156 Jun 24 07:41 www_2016-06-24.tar.ga
-rw-r--r--. 1 nfsnobody root 156 Jun 25 02:00 www_2016-06-25.tar.ga
-rw-r--r--. 1 nfsnobody root 111 Jun 24 07:20 www_bak_5.tar.ga
[[email protected] data]#
========================================================
遇到的问题总结：
1.
[[email protected] /]# showmount -e localhost
clnt_create: RPC: Program not registered
解决方法：
由于网络原因nfs服务被中断，重新开启nfs服务然后在客户端重新mount
service nfs restart 或 /etc/rc.d/init.d/nfs restart
2.有关NFS客服端开机自启动挂载：a b：
a:
[[email protected] data]# which mount
/bin/mount
vi /etc/rc.local
/bin/mount -t nfs 192.168.21.128:/data /nfsdir/ ***用全路径吧。
***这种挂载方式不会影响系统开机
b:
vi /etc/fstab
你现在可以动手测试。反正我的测试结果是挂载不了，且总结为:不要在 /etc/fstab中配置网络文件系统，本地的文件系统是可以的:fstab启动优先于网络。
3.查看挂载信息：
a.grep data（挂载目录）/proc/mounts
b.mount /proc/mounts
4.
[[email protected] mnt]# mount -t nfs 192.168.21.128:/date /mnt
mount.nfs: access denied by server while mounting 192.168.21.128:/date
仔细检查server端口：/etc/exports
5.
[[email protected] nfsdir]# showmount -e 192.168.21.128
clnt_create: RPC: Port mapper failure - Unable to receive: errno 111 (Connection refused)
解决：
[[email protected] data]# /etc/init.d/nfs status
rpc.svcgssd is stopped
rpc.mountd (pid 3026) is running...
nfsd (pid 3041 3040 3039 3038 3037 3036 3035 3034) is running...
rpc.rquotad (pid 3022) is running...
[[email protected] data]# /etc/init.d/rpcbind status
rpcbind (pid 3123) is running...
[[email protected] data]# rpc.mountd ####关键于此
[[email protected] data]# showmount -e
Export list for localhost:
/data 192.168.21.131/24
[[email protected] nfsdir]# showmount -e 192.168.21.128
Export list for 192.168.21.128:
/data 192.168.21.131/24
6.防火墙开启导致
[[email protected] nfsdir]# showmount -e 192.168.21.128
clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)
解决：
[[email protected] data]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules:
[[email protected] nfsdir]# showmount -e 192.168.21.128
Export list for 192.168.21.128:
/data 192.168.21.131/24
7.[[email protected] mnt]# mount -t nfs -o nosuid,rw 192.168.21.128:/data /mnt
mount.nfs: Stale file handle
解决：1.是由于server端共享的目录在共享期间做出了移动目录，又创建了同名字的目录导致的，即在共享期间对该共享目录进行了移除操作，只需要在客户端重新挂下就OK 。2.mount -a：把所有的分区挂载信息重新mount 一边，之后在查看nfs分区挂载正常。
8..exportfs：
1）exportfs -rv =/etc/init.d/nfs reload
2）举例：
[[email protected] data]# exportfs -o sync,rw 192.168.21.0/24:/d==不用重启nfs
不用vi /etc/exports 要重启，是修改的配置生效。
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