centos6 YUMREPO ERROR ALL MIRROR URLS ARE NOT USING FTP, HTTP[S] OR FILE

　　Centos6中执行yum update时，会报如下错误:

[root@mysql yum.repos.d]# yum update
Loaded plugins: fastestmirror
Determining fastest mirrors
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

　　这是因为在CentOS 6在2020年11月30过后，就不在维护了，直接下架了yum源，现在直接访问yum源网址是404状态。当然可以使用如下方法解决：

　　1.进入/etc/yum.repos.d/

# cd /etc/yum.repos.d/

　　2.编辑CentOS-Base.repo

# 先备份
# cp CentOS-Base.repo CentOS-Base.repo.old
 
# 编辑
# vim CentOS-Base.repo

　　3.编辑如下几个块

• • [base]
  • [updates]
  • [extras]

　　内容如下：

#下面的6.x最好根据自己的系统来
[base]
name=CentOS-$releasever - Base
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=https://vault.centos.org/6.x/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
 
# released updates
[updates]
name=CentOS-$releasever - Updates
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=https://vault.centos.org/6.x/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
 
# additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
baseurl=https://vault.centos.org/6.x/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

　　4.清楚缓存

# yum clean all

　　5.重新执行更新

　　以为到这里就结束了，其实并不是，重新执行更新，还有以下报错

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
https://vault.centos.org/6.5/os/x86_64/repodata/repomd.xml: [Errno 14] Peer cert cannot be verified or peer cert invalid
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again

　　这是因为原因：yum server 的ca证书不被认可。

　　6.跳过ca证书验证

　　Adding “sslverify=false” in the ‘/etc/yum.conf’ file。

[root@mysql yum.repos.d]# cat  /etc/yum.conf 
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=16&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release
sslverify=false

　　7.重新执行更新

　　这里可能比较卡，时间会比较长，但是一般出现进度条，基本就没问题了