【Linux】yum安装

一、删除原来的yum源

1、检查yum源：

1. rpm -qa | grep yum

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2、删除原来的yum源

1. rpm -qa|grep yum|xargs rpm -e --nodeps

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3、防止系统自带的插件subscription-manager订阅管理器进行注册

1. vi /etc/yum/pluginconf.d/subscription-manager.conf
2. #enabled=1

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二、拷贝这三个安装包

如果没有可以从这个地址下载：https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/
yum-3.4.3-168.el7.centos.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
三、安装三个包

1、使用以下下令一次性安装3个包

1. rpm -ivh yum-*

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2、检查是否安装成功

1. rpm -qa |grep yum

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四、设置repo文件

1、在linux中进入etc文件，备份yum.repos.d文件

1. cd /etc
2. mv yum.repos.d yum.repos.d.bak
3. mkdir yum.repos.d

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2、下载repo文件

1. wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

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或者

1. wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

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3、修改下载好的repo文件

下载好的repo文件应该在etc/yum.repos.d目录下，里面应该也只有一个文件，直接vim 文件名

1. vim /etc/yum.repos.d/CentOS-Base.repo

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把repo文件里全部 $releasever全部更换成版本号7
操作如下：
按下i键，然后按:
输入下令：

1.                 %s/$releasever/7/g

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更换完毕后，按Esc，然后 :wq 生存退出vim模式
2）-3）也可以手工放入

1. # CentOS-Base.repo
2. #
3. # The mirror system uses the connecting IP address of the client and the
4. # update status of each mirror to pick mirrors that are updated to and
5. # geographically close to the client.  You should use this for CentOS updates
6. # unless you are manually picking other mirrors.
7. #
8. # If the mirrorlist= does not work for you, as a fall back you can try the
9. # remarked out baseurl= line instead.
10. #
11. #
13. [base]
14. name=CentOS-7 - Base - mirrors.aliyun.com
15. failovermethod=priority
16. baseurl=http://mirrors.aliyun.com/centos/7/os/$basearch/
17.         http://mirrors.aliyuncs.com/centos/7/os/$basearch/
18.         http://mirrors.cloud.aliyuncs.com/centos/7/os/$basearch/
19. gpgcheck=1
20. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
22. #released updates
23. [updates]
24. name=CentOS-7 - Updates - mirrors.aliyun.com
25. failovermethod=priority
26. baseurl=http://mirrors.aliyun.com/centos/7/updates/$basearch/
27.         http://mirrors.aliyuncs.com/centos/7/updates/$basearch/
28.         http://mirrors.cloud.aliyuncs.com/centos/7/updates/$basearch/
29. gpgcheck=1
30. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
32. #additional packages that may be useful
33. [extras]
34. name=CentOS-7 - Extras - mirrors.aliyun.com
35. failovermethod=priority
36. baseurl=http://mirrors.aliyun.com/centos/7/extras/$basearch/
37.         http://mirrors.aliyuncs.com/centos/7/extras/$basearch/
38.         http://mirrors.cloud.aliyuncs.com/centos/7/extras/$basearch/
39. gpgcheck=1
40. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
42. #additional packages that extend functionality of existing packages
43. [centosplus]
44. name=CentOS-7 - Plus - mirrors.aliyun.com
45. failovermethod=priority
46. baseurl=http://mirrors.aliyun.com/centos/7/centosplus/$basearch/
47.         http://mirrors.aliyuncs.com/centos/7/centosplus/$basearch/
48.         http://mirrors.cloud.aliyuncs.com/centos/7/centosplus/$basearch/
49. gpgcheck=1
50. enabled=0
51. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
53. #contrib - packages by Centos Users
54. [contrib]
55. name=CentOS-7 - Contrib - mirrors.aliyun.com
56. failovermethod=priority
57. baseurl=http://mirrors.aliyun.com/centos/7/contrib/$basearch/
58.         http://mirrors.aliyuncs.com/centos/7/contrib/$basearch/
59.         http://mirrors.cloud.aliyuncs.com/centos/7/contrib/$basearch/
60. gpgcheck=1
61. enabled=0
62. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

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4、清除缓存

1. yum clean all

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5、重新天生缓存

1. yum makecache

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6、yum 更新

1. yum updateyum clean all
2. && yum makecache
3. && yum update

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