两步办理yum无法安装软件问题：Cannot find a valid baseurl for repo: cen ...

报错信息：

1. [root@iZwz946ibli8ikuyqgtc58Z ~]# yum install rh-redis5-redis
2. Loaded plugins: fastestmirror
3. Loading mirror speeds from cached hostfile
4. Could not retrieve mirrorlist http://mirrorlist.centos.org?arch=x86_64&release=7&repo=sclo-rh error was
5. 14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
8. One of the configured repositories failed (Unknown),
9. and yum doesn't have enough cached data to continue. At this point the only
10. safe thing yum can do is fail. There are a few ways to work "fix" this:
12.      1. Contact the upstream for the repository and get them to fix the problem.
15. ▽
16.      2. Reconfigure the baseurl/etc. for the repository, to point to a working
17.         upstream. This is most often useful if you are using a newer
18.         distribution release than is supported by the repository (and the
19.         packages for the previous distribution release still work).
21.      3. Run the command with the repository temporarily disabled
22.             yum --disablerepo=<repoid> ...
24.      4. Disable the repository permanently, so yum won't use it by default. Yum
25.         will then just ignore the repository until you permanently enable it
26.         again or use --enablerepo for temporary usage:
28.             yum-config-manager --disable <repoid>
29.         or
30.             subscription-manager repos --disable=<repoid>
32.      5. Configure the failing repository to be skipped, if it is unavailable.
33.         Note that yum will try to contact the repo. when it runs most commands,
34.         so will have to try and fail each time (and thus. yum will be be much
35.         slower). If it is a very temporary problem though, this is often a nice
36.         compromise:
38.             yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
40. Cannot find a valid baseurl for repo: centos-sclo-rh/x86_64

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出错缘故起因： 上述错误信息表明无法检索镜像列表，缘故起因是 http://mirrorlist.centos.org 已经制止服务了，因此我们需要更改scl源的baseUrl。
办理方案：
1、进入/etc/yum.repos.d目录，删除目录下面全部的软件包，删除下令如下：

1. sudo rm -rf *

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2、下载安装阿里云镜像仓库：两条下令都行

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

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3、下载安装阿里云epel.repo：

1. sudo curl -o /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo
3. sudo wget -O /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo

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4、扫除缓存：

1. yum clean all

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5、天生缓存：

1. yum makecache
2. yum makecache fast

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6、安装gcc-c++测试：

1. sudo yum -y install gcc-c++

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7、效果展示：安装成功

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