CentOS7 yum安装报错“Could not resolve host: mirrorlist.centos.org； Name or service n

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CentOS7 yum安装报错“Could not resolve host: mirrorlist.centos.org； Name or service not known“之解决办法（换源）

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[root@zabbix-server ~]# yum install devtoolset-11-gcc*
* L! k7 l2 Y% r8 H7 jLoaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
. z0 |/ e) t3 `9 A6 aCould not retrieve mirrorlist http://mirrorlist.centos.org/?re ... =os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
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One of the configured repositories failed (Unknown),
+ ~  m8 s+ {) w$ E4 ^3 j' g3 d and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.
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     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
5 f. a* b2 @# U        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).
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     3. Run the command with the repository temporarily disabled
# O- l3 H% x! e# }! F0 A            yum --disablerepo=<repoid> ...

+ ?; M/ `. l  ~3 q6 o% ^1 Q* A     4. Disable the repository permanently, so yum won't use it by default. Yum
8 j: j. Q: l, g# b! T6 Q+ M' M        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>
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* }& W% V. [7 x0 |     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
2 R- l7 w0 h) p- y! K2 j: S4 I        so will have to try and fail each time (and thus. yum will be be much
' V. v, S- Y% ^0 N- n7 O( Y        slower). If it is a very temporary problem though, this is often a nice
        compromise:

& ]: }2 ]+ i* `' r7 r& Z7 ?            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
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; v6 o: X. g6 m+ UCannot find a valid baseurl for repo: base/7/x86_64

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【解决办法】

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+ k1 {; ]& y) f# d+ |看到报错日志中加粗的字体，命令行ping mirrorlist.centos.org 不通。试着ping www.baidu.com是正常的，说明DNS解析没问题。基本确认是yum源的问题。
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CentOS7更换镜像源
1、先安装wget
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yum install -y wget

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2、打开阿里镜像http://mirrors.aliyun.com/
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点击，帮助，查看详情：


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7 U( m" k5 y: X# I3 ^6 Y3、下载CentOS 7的对应的repo文件

2 p5 w0 ]) D0 n9 @& C" r% L* dwget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
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#或者
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curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
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