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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5 q# m6 s) m$ [+ G5 |5 p. E[root@zabbix-server ~]# yum install devtoolset-11-gcc*
( j  n& J; D- J1 }3 k9 B3 t# T2 uLoaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?re ... =os&infra=stock error was
/ \9 B4 K0 S: h" u3 W14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"


One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
, o8 |- b# q9 \( ~4 j  Y safe thing yum can do is fail. There are a few ways to work "fix" this:
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9 Q( R  Y0 @: b0 f) n5 w' p. d     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
0 K( f6 y4 u% h$ W2 p9 I# r1 \" G        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
  J% T. V* a0 X9 @& A! y4 y* o        packages for the previous distribution release still work).
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     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
+ _- }$ v7 e* b; b5 R        will then just ignore the repository until you permanently enable it
0 P8 a3 D4 U3 w* J: D8 c        again or use --enablerepo for temporary usage:
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# X0 u& p1 _" ]# b1 J: F3 O# {+ A            yum-config-manager --disable <repoid>
        or
7 N; U% z* P  ^2 d3 \; L1 o            subscription-manager repos --disable=<repoid>
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% t/ X0 R7 v) E  M) S! S4 G     5. Configure the failing repository to be skipped, if it is unavailable.
: w, t5 M# p( S# K' c' B: O. Y        Note that yum will try to contact the repo. when it runs most commands,
6 c9 a! X3 N" f# V7 x; `        so will have to try and fail each time (and thus. yum will be be much
: x0 D. e2 n2 m- K2 ]$ E        slower). If it is a very temporary problem though, this is often a nice
        compromise:
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            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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; F( N2 X- j$ k! E4 ^$ w【解决办法】
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! Z$ I* A: y! [1 U! f, q% f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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2 M4 p+ U/ L8 z9 h* oCentOS7更换镜像源
0 S$ z! P* {" Z3 f3 b8 p1、先安装wget

' r' d! O2 }/ v) @8 `yum install -y wget



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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3、下载CentOS 7的对应的repo文件
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# l* L/ P) G( S8 J9 W. ~wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

#或者
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) r! o+ ^# n3 R/ acurl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

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