1. 下載 yum安裝包:
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/yum-2.4.3-4.el4.centos.noarch.rpm
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/yum-metadata-parser-1.0-8.el4.centos.i386.rpm
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/python-elementtree-1.2.6-5.el4.centos.i386.rpm
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/python-sqlite-1.1.7-1.2.1.i386.rpm
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/python-urlgrabber-2.9.8-2.noarch.rpm
# wget http://vault.centos.org/4.8/os/i386/CentOS/RPMS/sqlite-3.3.6-2.i386.rpm
# wget http://www.eomy.net/linux/install-yum/centos-yumconf-4-4.5.noarch.rpm
2. 安裝rpm包：
# rpm -ivh yum-2.4.3-4.el4.centos.noarch.rpm
warning: yum-2.4.3-4.el4.centos.noarch.rpm: V3 DSA signature: NOKEY, key ID 443e1821
error: Failed dependencies:
yum-metadata-parser is needed by yum-2.4.3-4.el4.centos.noarch
yumconf is needed by yum-2.4.3-4.el4.centos.noarch
# rpm -ivh yum-metadata-parser-1.0-8.el4.centos.i386.rpm
warning: yum-metadata-parser-1.0-8.el4.centos.i386.rpm: V3 DSA signature: NOKEY, key ID 443e1821
error: Failed dependencies:
libsqlite3.so.0 is needed by yum-metadata-parser-1.0-8.el4.centos.i386
# rpm -ivh sqlite-3.3.6-2.i386.rpm
warning: sqlite-3.3.6-2.i386.rpm: V3 DSA signature: NOKEY, key ID 443e1821
Preparing... ########################################### [100%]
1:sqlite ########################################### [100%]
# rpm -ivh yum-metadata-parser-1.0-8.el4.centos.i386.rpm
warning: yum-metadata-parser-1.0-8.el4.centos.i386.rpm: V3 DSA signature: NOKEY, key ID 443e1821
Preparing... ########################################### [100%]
1:yum-metadata-parser ########################################### [100%]
# rpm -ivh centos-yumconf-4-4.5.noarch.rpm
warning: centos-yumconf-4-4.5.noarch.rpm: V3 DSA signature: NOKEY, key ID 443e1821
Preparing... ########################################### [100%]
1:centos-yumconf ########################################### [100%]
warning: yum-2.4.3-4.el4.centos.noarch.rpm: V3 DSA signature: NOKEY, key ID 443e1821
Preparing... ########################################### [100%]
1:yum ########################################### [100%]
以下rpm包也需要安裝：
# rpm -ivh python-elementtree-1.2.6-5.el4.centos.i386.rpm
# rpm -ivh python-urlgrabber-2.9.8-2.noarch.rpm
# rpm -ivh python-sqlite-1.1.7-1.2.1.i386.rpm
3. 修改 /etc/yum.conf：
02 cachedir=/var/cache/yum
03 debuglevel=2
04 logfile=/var/log/yum.log
05 pkgpolicy=newest
06 installonlypkgs=kernel kernel-smp kernel-devel kernel-smp-devel kernel-largesmp kernel-largesmp-devel kernel-hugemem kernel-hugemem-devel
07 distroverpkg=centos-release
08 tolerant=1
09 exactarch=1
10 retries=20
11 obsoletes=1
12 gpgcheck=1
13 plugins=1
14
15 # PUT YOUR REPOS HERE OR IN separate files named file.repo
16 # in /etc/yum.repos.d
17
18 [base]
19 name=centos-4.8 - Base
20 baseurl=http://vault.centos.org/4.8/os/i386/
21 # the other site: http://centos.candishosting.com.cn/centos/5/os/i386/
22 # you can find more site in: http://www.centos.org/modules/tinycontent/index.php?id=13
23 enabled=1
24 gpgcheck=1
25 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
26 #released updates
27 [update]
28 name=CentOS-4.8 - Updates
29 baseurl=http://vault.centos.org/4.8/updates/i386/
30 gpgcheck=1
31 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
32 #packages used/produced in the build but not released
33 [addons]
34 name=CentOS-4.8 - Addons
35 baseurl=http://vault.centos.org/4.8/addons/$basearch/
36 gpgcheck=1
37 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
38 #additional packages that may be useful
39 [extras]
40 name=CentOS-4.8 - Extras
41 baseurl=http://vault.centos.org/4.8/extras/$basearch/
42 gpgcheck=1
43 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
44 #additional packages that extend functionality of existing packages
45 [centosplus]
46 name=CentOS-4.8 - Plus
47 baseurl=http://vault.centos.org/4.8/centosplus/$basearch/
48 gpgcheck=1
49 enabled=0
50 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
51 #contrib - packages by Centos Users
52 [contrib]
53 name=CentOS-4.8 - Contrib
54 baseurl=http://vault.centos.org/4.8/contrib/$basearch/
55 gpgcheck=1
56 enabled=0
57 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
58 #packages in testing
59 [testing]
60 name=CentOS-5 - Testing
61 baseurl=http://vault.centos.org/4.8/testing/$basearch/
62 gpgcheck=1
63 enabled=0
64 gpgkey=http://vault.centos.org/4.8/os/i386/RPM-GPG-KEY-centos4
4. # yum clean all
# yum makecache
# yum update
參考：
http://down.chinaz.com/server/201111/1321_1.htm
http://blog.csdn.net/sunboy_2050/article/details/5629370
http://hi.baidu.com/529970816/item/0ea855bb068c2af163388ef7
