$ sudo umount /mnt/
/mnt was not found in /proc/mounts
/mnt was not found in /proc/mounts
解决：
umount 时使用 -l 命令。
$ sudo umount -l /mnt/
NFS的安装配置：
centos 5 :
yum install nfs-utils portmap
centos 6 :
yum install nfs-utils rpcbind
本节是使用centos 6的配置过程：
设备：两台 centos6 OS 安装的时候选择的是"Basic Server"软件配置包。
首先，让两台机器都安装NFS的 软件包，如下显示的是服务器端：
[root@roothomes /home]$ yum install nfs-utils rpcbind
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.ustc.edu.cn
* extras: centos.ustc.edu.cn
* updates: centos.ustc.edu.cn
Setting up Install Process
Package rpcbind-0.2.0-8.el6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package nfs-utils.x86_64 1:1.2.3-15.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Updating:
nfs-utils x86_64 1:1.2.3-15.el6 base 308 k
Transaction Summary
================================================================================
Install 0 Package(s)
Upgrade 1 Package(s)
Total download size: 308 k
Is this ok [y/N]: y
Downloading Packages:
nfs-utils-1.2.3-15.el6.x86_64.rpm | 308 kB 00:10
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
base/gpgkey | 3.3 kB 00:00 ...
Importing GPG key 0xC105B9DE "CentOS-6 Key (CentOS 6 Official Signing Key) <cent os-6-key@centos.org="">" from /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : 1:nfs-utils-1.2.3-15.el6.x86_64 1/2
Cleanup : 1:nfs-utils-1.2.2-7.el6.x86_64 2/2
Updated:
nfs-utils.x86_64 1:1.2.3-15.el6
Complete!
[root@roothomes /home]$
服务器端：
###(建立挂载的目录，并且挂载目录。)
[root@roothomes /etc]$ mkdir /opt/centos6
[root@roothomes /etc]$ cd /opt/centos6/
[root@roothomes /opt/centos6]$ mkdir thisISnfsFile
[root@roothomes /opt/centos6]$ ls
thisISnfsFile
[root@roothomes /etc]$ vi /etc/exports
[root@roothomes /opt/centos6]$ cat /etc/exports
/opt/centos6 192.168.1.0/24(ro,no_root_squash)
### 备注:/opt/centos6表示nfs共享的目录 192.168.1.0-192.168.1.254区间的IP可以访问，访问权限是自读，root 用户
###(启动对应的服务)
[root@roothomes /opt/centos6]$ chkconfig nfs on
[root@roothomes /opt/centos6]$ /etc/init.d/rpcbind start
[root@roothomes /opt/centos6]$ /etc/init.d/nfs start
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
[root@roothomes /opt/centos6]$ service iptables stop
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
客户端：
[root@roothomes /home]$ yum install nfs-utils rpcbind
安装完毕！
[root@vmBS00 ~]# service iptables stop
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
###查看是否能访问nfs服务
[root@vmBS00 ~]# showmount -e 192.168.1.75
Export list for 192.168.1.75:
/opt/centos6 192.168.1.0/24
[root@vmBS00 ~]# mkdir /opt/centos6
[root@vmBS00 ~]# mount -t nfs 192.168.1.75:/opt/centos6/ /opt/centos6/
[root@vmBS00 ~]# ls /opt/centos6/
thisISnfsFile
###配置开机自动挂载
[root@vmBS00 ~]# vi /etc/fstab
### 添加 #192.168.1.75:/opt/centos6/ /opt/centos6/ nfs nodev,ro,rsize=32768,wsize=32768 0 0
[root@vmBS00 ~]# init 6
[root@vmBS00 ~]#
login as: root
root@192.168.1.116's password:
Last login: Mon Mar 5 17:29:04 2012 from 192.168.1.23
[root@vmBS00 ~]# ls /opt/centos6/
thisISnfsFile
[root@vmBS00 ~]#