• 前言
• 設置網卡開機自動啟動
• 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，發現無法使用yum命令進行更新，在更新的時候會出現下面這種內容，為此問題有以下這些解決方案可以嘗試。

One of the configured repositories failed (Unknown),and yum doesn't have enough cached data to continue. At this point the onlysafe 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 workingupstream. This is most often useful if you are using a newerdistribution release than is supported by the repository (and thepackages for the previous distribution release still work).3. Disable the repository, so yum won't use it by default. Yum will thenjust 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 muchslower). If it is a very temporary problem though, this is often a nicecompromise:yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

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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:

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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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設置網卡開機自動啟動

針對這個問題首先要確認網卡是否已經啟動了，CentOS7最開始安裝完的時候網卡可能會是關閉的，需要自己自行開啟。

確保自己使用的是root賬號，若不是，請自行更換。

1、進入/etc/sysconfig/network-scripts 目錄。即輸入命令 "cd /etc/sysconfig/network-scripts" ，使用命令 "ls -a" 可以查看該目錄下的所有文件。

2、修改ifcfg-ens33的網卡配置文件（CentOS7修改了網卡命名規則，不再是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。

3、將 "ONBOOT" 的值修改為 "yes" ，之后按esc退出編輯模式，輸入 ":wq" 保存退出

4、重啟系統或者重啟網卡，輸入命令 "reboot" 或 "service network restart"。

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設置國內dns服務器

若已經開啟了網卡還是存在該問題可以嘗試配置下國內的dns。

1、輸入命令 "vi /etc/resolv.conf"?

2、添加 "nameserver 114.114.114.114"?

3、保存后，重啟系統或者重啟網卡，輸入命令 "reboot" 或 "service network restart"。

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修改CentOS-Base.repo中的地址

若上述方法還是無效可以嘗試修改CentOS-Base.repo中的地址

1、進入 "/etc/yum.repos.d" 。

2、編輯 "vi CentOS-Base.repo" 。

3、將所有的 "mirrorlist" 注釋掉，將所有的 "baseurl" 取消注釋。

4、保存后，重啟系統，輸入命令 "reboot" 。

總結

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