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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& z  H/ i1 G' `8 Y8 E' A. A' s[root@zabbix-server ~]# yum install devtoolset-11-gcc*
( O. i  p& ^& N7 j) P/ gLoaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?re ... =os&infra=stock error was
- R8 d3 N: f# `( N* q& p14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
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1 v8 d$ k7 v% r5 b+ D One of the configured repositories failed (Unknown),
" v( M6 C. }, x) D; D4 \7 y and yum doesn't have enough cached data to continue. At this point the only
* w4 b, C" V; P( N* }8 C9 P$ c safe thing yum can do is fail. There are a few ways to work "fix" this:
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     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
. x" q0 D/ J6 n/ `+ e        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).
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$ [. c. \7 t6 a, G     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
1 ?" j9 h" o7 P$ F' d        will then just ignore the repository until you permanently enable it
# l0 L. ~* W: A8 m/ C- R        again or use --enablerepo for temporary usage:
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            yum-config-manager --disable <repoid>
        or
  D6 p# l( L+ D5 _  L/ x            subscription-manager repos --disable=<repoid>
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     5. Configure the failing repository to be skipped, if it is unavailable.
+ f- y, f) K6 [; a. ?/ f        Note that yum will try to contact the repo. when it runs most commands,
2 L+ k) Q! O, x1 ^8 b        so will have to try and fail each time (and thus. yum will be be much
$ a4 V" _) B  E        slower). If it is a very temporary problem though, this is often a nice
        compromise:

& T! z% M8 ], d: P1 C            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

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9 w# T. e, |1 `【解决办法】


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! V% z, D  E8 P4 }$ d+ @' _' u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
: F/ @, }/ y8 F1、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/

点击，帮助，查看详情：
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3、下载CentOS 7的对应的repo文件

( \! M4 j( @6 x5 }5 @8 mwget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

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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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