yum使用時 could not resolve host 報錯的解決方法

[root@cloud test]# yum list
已載入外掛：fastestmirror
http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的錯誤"
正在嘗試其它映象。
 
 
 One of the configured repositories failed (CentOS-7 - Base - 163.com),
 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=base ...
 
    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 base
        or
            subscription-manager repos --disable=base
 
    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
        compromise:
 
            yum-config-manager --save --setopt=base.skip_if_unavailable=true
 
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.

如果使用 yum list 或者安裝某檔案時提示這種報錯，host 解析有問題，請檢查網路 DNS 設定，重新啟動網路服務，OK。

更多YUM相關教學見以下內容：

RHEL7 本地yum源設定 http://www.linuxidc.com/Linux/2017-01/139140.htm

CentOS 6.5 設定本地Yum源  http://www.linuxidc.com/Linux/2017-04/143127.htm

CentOS 7 使用阿里雲的yum源、PIP源 http://www.linuxidc.com/Linux/2017-01/13966.htm

CentOS及Red Hat Linux安裝yum源  http://www.linuxidc.com/Linux/2017-02/140205.htm

CentOS 7更改yum源與更新系統 http://www.linuxidc.com/Linux/2017-01/140067.htm

RedHat7.0設定本地yum源  http://www.linuxidc.com/Linux/2017-01/139148.htm 

RedHat Linux 7安裝CentOS 7 yum源  http://www.linuxidc.com/Linux/2017-04/142444.htm

軟體包管理之前端管理工具yum  http://www.linuxidc.com/Linux/2017-02/140270.htm

CentOS 7 使用阿里雲的yum源、PIP源 http://www.linuxidc.com/Linux/2017-01/13966.htm

本文永久更新連結地址：http://www.linuxidc.com/Linux/2017-10/147236.htm