https://blog.csdn.net/weixin_45621658/article/details/110734514

原因：centos6的默認(rèn)源在2012年-12月左右被官方搞掉了
下列是錯(cuò)誤詳情
Bash
[root@c8-20 ~]# yum makecache
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
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或者
Bash
[root@li496-237 ~]# yum -y install unzip zip
Loaded plugins: fastestmirror
Setting up Install Process
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
http://mirrors.linode.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 404 Not Found”
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn’t help to resolve this issue please open a ticket with Red Hat Support.

Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify
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第一種方法：一鍵修復(fù)(一條一條執(zhí)行即可):
一般執(zhí)行了前3條命令就好了
Bash
sed -i “s|enabled=1|enabled=0|g” /etc/yum/pluginconf.d/fastestmirror.conf
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo
yum clean all
yum makecache
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第二種方法：手動(dòng)修復(fù)教程:
首先把fastestmirrors關(guān)了
Markup
#編輯
vi /etc/yum/pluginconf.d/fastestmirror.conf
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#修改
enable=0
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#或者執(zhí)行以下命令
sed -i “s|enabled=1|enabled=0|g” /etc/yum/pluginconf.d/fastestmirror.conf
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先把之前的repo挪到備份，然后下面兩個(gè)二選一
Markup
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
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替換為官方Vault源
Markup
curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Official.repo
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替換為阿里云Vault鏡像
Markup
curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo

Gedit報(bào)錯(cuò)

Gtk-WARNING **: cannot open display: 問(wèn)題解決
這幾天在ubutu上用vim一直出問(wèn)題，網(wǎng)上找了很多解決方法都沒有解決，然后朋友推薦用gedit文本編輯器，好吧，那就試試。
在root用戶運(yùn)行g(shù)edit時(shí)，提示出錯(cuò)

然后百度，說(shuō)是因?yàn)?#xff1a;Xserver默認(rèn)情況下不允許別的用戶的圖形程序的圖形顯示在當(dāng)前屏幕上. 如果需要?jiǎng)e的用戶的圖形顯示在當(dāng)前屏幕上, 則應(yīng)以當(dāng)前登陸的用戶, 也就是切換身份前的用戶執(zhí)行如下命令。
當(dāng)前登陸普通用戶執(zhí)行：xhost +

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