NFS题：
1.共享/nfs/media,使192.168.1.0/24下的所有人只读，root用户映射为匿名用户。
/nfs/media 192.168.1.0/255.255.255.0(ro,root_squash)
2.共享/nfs/***,使s168.365linux.com这台主机可以读写，其他用户只读，且root映射为匿名用户。
/nfs/*** s168.365linux.com(rw) *(ro,root_squash)
3.共享/nfs/software,所有人只读访问，访问者（包括root）映射成用户nfsuser,组nfsuser。
/nfs/software *(ro,anonuid=500,anongid=500)
Useradd –s /sbin/nologin nfsuser
查看ID
Cat /
安装配置过程
1.安装NFS
[root@localhost ~]# mkdir
/cdrom
[root@localhost ~]# mount
/dev/cdrom-hdc /cdrom/
mount: block device /dev/cdrom-hdc is
write-protected, mounting read-only
1.1 RPM安装方式
[root@localhost ~]# cd
/cdrom/Server/
[root@localhost
Server]# rpm -ivh portmap-4.0-65.2.2.1.i386.rpm
Preparing...
(100########################################### [100%]
package portmap-4.0-65.2.2.1.i386 is
already installed
[root@localhost
Server]# rpm -ivh nfs-utils-1.0.9-44.el5.i386.rpm
Preparing...
(100###########################################
[100%]
package nfs-utils-1.0.9-44.el5.i386 is
already installed
[root@localhost Server]#
1.2 YUM安装方式
配置YUM
[root@localhost Server]# vi /etc/yum.repos.d/rhel-debuginfo.repo
修改如下：
[rhel-debuginfo]
name=Red Hat Enterprise Linux $releasever -
$basearch - Debug
baseurl=file:///cdrom/Server
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
安装
[root@localhost Server]# yum -y install nfs-utils
2.配置
[root@localhost Server]# vi /etc/exports
配置文件中的内容按照题目，配置
/nfs/media 192.168.1.0/255.255.255.0(ro,root_squash)
/nfs/*** s168.365linux.com(rw) *(ro,root_squash)
/nfs/software *(ro,anonuid=503,anongid=503)
~
[root@localhost Server]# useradd -s /sbin/nologin nfsuser
查看此用户的ID号
[root@localhost Server]# cat /etc/passwd
3.测试
[root@localhost Server]# service portmap restart
Stopping portmap:
[ OK ]
Starting portmap:
[ OK ]
[root@localhost Server]# service nfs restart
Shutting down NFS mountd: [FAILED]
Shutting down NFS daemon: [FAILED]
Shutting down NFS quotas: [FAILED]
Shutting down NFS services: [FAILED]
Starting NFS services: exportfs: s168.365linux.com has non-inet addr
exportfs: s168.365linux.com has non-inet
addr
[ OK ]
Starting NFS quotas: [ OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
Starting RPC idmapd: [ OK ]
[root@localhost Server]# vi /etc/hosts
在此文件中加入红色部分内容
# Do not remove the following line, or
various programs
# that require network functionality will
fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
172.16.41.180 s168.365linux.com
~
[root@localhost Server]# service nfs restart
Shutting down NFS mountd: [
OK ]
Shutting down NFS daemon: [ OK ]
Shutting down NFS quotas: [ OK ]
Shutting down NFS services: [ OK ]
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
[root@localhost Server]#
[root@localhost Server]# showmount -e 172.16.41.144
Export list for 172.16.41.180:
/nfs/software *
/nfs/media 192.168.1.0/255.255.255.0
/nfs/*** (everyone)
考试非必需
进入另一台LINUX
权限规则（就是小括号内的参数）
l rw：read-write,可读/写
l ro：read-only，只读
l sync:数据同步写入到内存与硬盘当中
l async:数据会先暂存于内存当中，而非直接写入硬盘
l no_root_squash：登录NFS主机使用共享目录的用户，如果是ROOT，那么对于这个共享的目录来说，它就具有ROOT的权限，这个设置“极不安全”不建议使用
l root_squash：在登录NFS主机使用共享目录的用户如果是ROOT，那么这个用户的权限将被压缩成匿名用户，通常它的UID和GID都会变成NOBODY（nfsnobody）这个系统账号的身份
l all_squash：不论登录NFS的用户身份如何，它的身份都会被压缩成匿名用户，NOBODY（nfsnobody）
l anonuid：anon是指anonymous(匿名)
l anongid：
