前言

功能说明：自动检测系统并更新源。

适用系统：兼容线上所有 Linux 版本。

注意事项：由于系统版本都有支持的周期所以部分源可能会出现不可用的情况，包括官方的源，这是正常情况。

千锤百炼过的，无脑四步走就行，前提是服务器可以访问外网！！

1.导入CentOS-6的GPG证书

# rpm --import http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6

[root@node1 hwb]# ll
总用量 79532
-rw-r--r-- 1 root root 2006 6月 18 05:49 CentOS6-Base-163.repo
-rwxr-xr-x. 1 root root 81407719 2月 15 23:26 etest.war
-rw-r--r-- 1 root root 1706 6月 18 05:53 RPM-GPG-KEY-CentOS-6
drwxrwxrwx. 2 root root 4096 4月 4 21:57 test
-rwxr-xr-x 1 root root 13944 2月 27 2015 update_source.sh
-rw-r--r-- 1 root root 2122 6月 18 05:43 update_source.tgz
[root@node1 hwb]# cat RPM-GPG-KEY-CentOS-6 
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.5 (GNU/Linux)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=jrWY
-----END PGP PUBLIC KEY BLOCK-----
[root@node1 hwb]# rpm --import RPM-GPG-KEY-CentOS-6 
[root@node1 hwb]# 

2.让yum使用网易的源

#cd /etc/yum.repos.d/

#wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

#mv CentOS6-Base-163.repo CentOS-Base-163.repo

[root@node1 ~]# cd /etc/yum.repos.d/
[root@node1 yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
--2017-06-23 01:51:27-- http://mirrors.163.com/.help/CentOS6-Base-163.repo
正在解析主机 mirrors.163.com... 123.58.173.186, 123.58.173.185
正在连接 mirrors.163.com|123.58.173.186|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2006 (2.0K) [application/octet-stream]
正在保存至: “CentOS6-Base-163.repo”
100%[=============================================================================================================================>] 2,006 --.-K/s in 0.001s 
2017-06-23 01:51:27 (2.03 MB/s) - 已保存 “CentOS6-Base-163.repo” [2006/2006])
[root@node1 yum.repos.d]# ll
总用量 12
drwxr-xr-x. 2 root root 4096 6月 18 05:40 backup
-rw-r--r-- 1 root root 2006 9月 18 2014 CentOS6-Base-163.repo
[root@node1 yum.repos.d]# mv CentOS6-Base-163.repo CentOS-Base-163.repo
[root@node1 yum.repos.d]# ll
总用量 8
drwxr-xr-x. 2 root root 4096 6月 18 05:40 backup
-rw-r--r-- 1 root root 2006 9月 18 2014 CentOS-Base-163.repo

3.修改repo文件在所有mirrorlist前面加上#，把所有$releasever替换成6，保存

sed -i '/mirrorlist/d' CentOS-Base-163.repo
sed -i '/\[addons\]/,/^$/d' CentOS-Base-163.repo
sed -i 's/\$releasever/6/' CentOS-Base-163.repo
sed -i 's/RPM-GPG-KEY-CentOS-5/RPM-GPG-KEY-CentOS-6/' CentOS-Base-163.repo
[root@node1 桌面]# cat /etc/yum.repos.d/CentOS-Base-163.repo 
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
# remarked out baseurl= line instead.
[base]
name=CentOS-6 - Base - 163.com
baseurl=http://mirrors.163.com/centos/6/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#released updates 
[updates]
name=CentOS-6 - Updates - 163.com
baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-6 - Extras - 163.com
baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-6 - Contrib - 163.com
baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

4、清理并重新生成yum缓存

#yum clean metadata

#yum makecache

觉得有用的走波关注呗~