CentOS7 沒法使用yum命令，沒法更新解決方法

• 前言
  
• 設置網卡開機自動啓動
  
• 設置國內dns服務器系統
  
• 修改CentOS-Base.repo中的地址
  
• 所參考的文章地址

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前言

剛安裝完的CentOS7的系統，發現沒法使用yum命令進行更新，在更新的時候會出現下面這種內容，爲此問題有如下這些解決方案能夠嘗試。

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. Disable the repository, 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>

     4. 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=<repoid>.skip_if_unavailable=true

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1

 One of the configured repositories failed (Unknown),

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 and yum doesn't have enough cached data to continue. At this point the only

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 safe thing yum can do is fail. There are a few ways to work "fix" this:

4

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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

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        upstream. This is most often useful if you are using a newer

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        distribution release than is supported by the repository (and the

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        packages for the previous distribution release still work).

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     3. Disable the repository, so yum won't use it by default. Yum will then

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        just ignore the repository until you permanently enable it again or use

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        --enablerepo for temporary usage:

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            yum-config-manager --disable <repoid>

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     4. Configure the failing repository to be skipped, if it is unavailable.

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        Note that yum will try to contact the repo. when it runs most commands,

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        so will have to try and fail each time (and thus. yum will be be much

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        slower). If it is a very temporary problem though, this is often a nice

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        compromise:

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

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設置網卡開機自動啓動

針對這個問題首先要確認網卡是否已經啓動了，CentOS7最開始安裝完的時候網卡可能會是關閉的，須要本身自行開啓。

確保本身使用的是root帳號，若不是，請自行更換。

一、進入/etc/sysconfig/network-scripts 目錄。即輸入命令 "cd /etc/sysconfig/network-scripts" ，使用命令 "ls -a" 能夠查看該目錄下的全部文件。

二、修改ifcfg-ens33的網卡配置文件 （CentOS7修改了網卡命名規則，再也不是eth0了，而是ifcfg-eno+數字）。輸入命令 "vi ifcfg-ens33" 進入vi編輯器， 按下"i"或者"insert"鍵進入編輯模式。

三、將 "ONBOOT" 的值修改成 "yes" ，以後按esc退出編輯模式，輸入 ":wq" 保存退出

四、重啓系統或者重啓網卡，輸入命令 "reboot" 或 "service network restart"。

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設置國內dns服務器

若已經開啓了網卡仍是存在該問題能夠嘗試配置下國內的dns。

一、輸入命令 "vi /etc/resolv.conf" 

二、添加 "nameserver 114.114.114.114" 

三、保存後，重啓系統或者重啓網卡 ，輸入命令 "reboot" 或 "service network restart"。

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修改CentOS-Base.repo中的地址

若上述方法仍是無效能夠嘗試修改CentOS-Base.repo中的地址

一、進入 "/etc/yum.repos.d" 。

二、編輯 "vi CentOS-Base.repo" 。

三、將全部的 "mirrorlist" 註釋掉，將全部的 "baseurl" 取消註釋。

四、 保存後，重啓系統 ，輸入命令 "reboot" 。

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參考文章

http://www.javashuo.com/article/p-decvhgjc-dx.html 

https://blog.csdn.net/zhousenshan/article/details/53140979 

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