㈠ 兩台nfs伺服器怎麼搭建主備自動切換
方法如下：
1、首先建立 auto.master 文件，沒有的話就新建，如果存在的話修改下就行
我的原來就有，於是我就在此基礎上修改的
########################
[root@localhost ~]# vi /etc/auto.master
#
# $Id: auto.master,v 1.4 2005/01/04 14:36:54 raven Exp $
#
# Sample auto.master file
# This is an automounter map and it has the following format
# key [ -mount-options-separated-by-comma ] location
# For details of the format look at autofs(5).
#
/misc /etc/auto.misc
#
# NOTE: mounts done from a hosts map will be mounted with the
# "nosuid" and "nodev" options unless the "suid" and "dev"
# options are explicitly given.
#
/net -hosts
#
# Include central master map if it can be found using
# nsswitch sources.
#
# Note that if there are entries for /net or /misc (as
# above) in the included master map any keys that are the
# same will not be seen as the first read key seen takes
# precedence.
#
#+auto.master
/var/Net/Files /etc/auto.nfs
################
我把配置文件中紅色的部分注釋掉了，因為存在的話 查看日誌文件的話會有錯誤提示
tail -f /var/log/messages
Dec 2 08:52:21 localhost automount[6475]: lookup_read_master: lookup(nisplus): couldn't locate nis+ table auto.master
2、然後建立目錄
mkdir /var/Net/Files
注意，要保證 Files 目錄是空的
3、建立 auto.nfs 配置文件
[root@localhost ~]# vi /etc/auto.nfs
temp -rw,bg,soft,rsize=32768,wsize=32768 10.2.2.136:/var/Net/Files/temp
UPGRADE_FILE -rw,bg,soft,rsize=32768,wsize=32768 10.2.2.136:/var/Net/Files/UPGRADE_FILE
UPGRADE_DOC -rw,bg,soft,rsize=32768,wsize=32768 10.2.2.136:/var/Net/Files/UPGRADE_DOC
4、136是伺服器，137是客戶端，紅色部分需要和伺服器中的exports配置文件相對應
[root@localhost rsync]# cat /etc/exports
/var/Net/Files/temp
/ 10.2.2.137(rw,no_root_squash)
/var/Net/Files/UPGRADE_DOC
/ 10.2.2.137(rw,no_root_squash)
/var/Net/Files/UPGRADE_FILE
/ 10.2.2.137(rw,no_root_squash)
伺服器要開啟 portmap 和 nfs 服務
[root@localhost rsync]# /etc/init.d/portmap restart
[root@localhost rsync]# /etc/init.d/nfs restart
5、客戶端啟動 autofs 服務
[root@localhost Files]# /etc/init.d/autofs restart
查看日誌，保證沒有錯誤
tail -f /var/log/messages
查看服務端是否開啟/提供服務
[root@localhost Files]# showmount -e 10.2.2.136(服務端)
Export list for 10.2.2.136:
/var/Net/111 10.2.2.137
/var/Net/Files/temp 10.2.2.137
/var/Net/Files/UPGRADE_DOC 10.2.2.137
/var/Net/Files/UPGRADE_FILE 10.2.2.137
6、測試的方法就是
cd /var/Net/Files目錄中看不見任何內容，
然後
cd UPGRADE_FILE
cd UPGRADE_DOC
cd temp
能進去，能使用 ，差不多就這樣