CentOS 7 停止维护后，很多源都失效了，使用 yum 的时候报错 404，需要修改源才能继续使用。

老版本 CentOS 源被更改成 vault 源，需要更换成 vault 源才能继续使用 yum。

一、修改成官方源

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sudo sed -i.bak \
  -e 's|^mirrorlist=|#mirrorlist=|g' \
  -e 's|^#baseurl=http://mirror.centos.org/centos|baseurl=https://vault.centos.org/centos|g' \
  /etc/yum.repos.d/CentOS-Base.repo

二、换成阿里云源

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curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

三、更换成中科大的源

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cat > /etc/yum.repos.d/CentOS-Base.repo <<-'EOF'
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos-vault/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos-vault/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#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=https://mirrors.ustc.edu.cn/centos-vault/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos-vault/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
EOF

EPEL 源

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curl -o /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo

使用 ISO 做为离线仓库

iso 选择 everything 版本镜像

2.创建 ISO 存放目录以及挂载目录

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mkdir /mnt/cdrom

4.挂载 ISO 镜像到挂载目录

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mount -o loop /mnt/iso/*.iso /mnt/cdrom
  1. 检查挂载是否成功
    df -h
    2.备份 /etc/yum.repos.d 目录里的原始 repo 文件
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cd /etc/yum.repos.d
mkdir bak
mv *.repo bak/

4.写入信息至 local.repo

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cat > /etc/yum.repos.d/local.repo <-'EOF'
[local]
name=local
#挂载地址：/mnt/cdrom
baseurl=file:///mnt/cdrom    
enabled=1                    
gpgcheck=0
#cd /mnt/cdrom/可以看到KEY
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-7
EOF

yum 安装

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yum clean all
yum install ntp

取消挂载

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umount /mnt/cdrom