Could not retrieve mirrorlist CentOS 7

在使用CentOS 7的YUM包管理器时,可能会遇到如下错误:

Loaded plugins: fastestmirror
Determining fastest mirrors
Could not retrieve mirrorlist error was
14: curl#7 - "Failed to connect to 2a05:d012:8b5:6503:9efb:5cad:348f:e826: Network is unreachable"

One of the configured repositories failed (Unknown),
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.

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
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).

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
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:

yum-config-manager --disable <repoid>
subscription-manager repos --disable=<repoid>

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,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice

yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

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



1. 备份当前YUM配置文件


cp -r /etc/yum.repos.d /etc/yum.repos.d.backup

2. 修改YUM配置文件


# 将所有配置文件中的 mirrorlist 注释掉
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

# 将 baseurl 更改为存档地址
sed -i 's|#baseurl=|baseurl=|g' /etc/yum.repos.d/CentOS-*

3. 更新YUM缓存


yum clean all
yum makecache

4. 验证YUM配置


yum update



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