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1. 下载 yum安装包:
# 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. 安装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%]
# 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
Preparing... ########################################### [100%]
1:yum ########################################### [100%]
以下rpm包也需要安装：
# 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：
01
[main
]
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
参考：
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
http://www.eomy.net/linux/install-yum/
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/ch-yum.html | 
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