镜像网络无法访问

1.情况介绍

• yum 报错：Could not retrieve mirrorlist http://mirrorlist.centos.org

• 不是网络问题，ping www.baidu.com可以通、DNS也设置了；

报错情况：

2.原因

• 服务器没法访问镜像的网络，所以我们需要配置正确的镜像源；

3.解决

3.1进入文件目录

cd  /etc/yum.repos.d

3.2编辑CentOS-Base.repo 文件

vim /etc/yum.repos.d/CentOS-Base.repo

• 全部替换

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

3.3编辑 CentOS-SCLo-scl-rh.repo 文件

vim /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo

• 替换对应内容

[centos-sclo-rh]
name=CentOS-$releasever - SCLo rh
baseurl=https://mirrors.aliyun.com/centos/$releasever/sclo/$basearch/rh/
gpgcheck=1
enabled=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

3.4编辑 CentOS-SCLo-scl.repo 文件

vim /etc/yum.repos.d/CentOS-SCLo-scl.repo

• 替换对应内容

[centos-sclo-sclo]
name=CentOS-$releasever - SCLo sclo
baseurl=https://mirrors.aliyun.com/centos/$releasever/sclo/$basearch/sclo/
gpgcheck=1
enabled=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

3.5清理缓存

yum clean all

3.6.重新加载缓存

yum makecache

GPG验证检查不通过

1.情况描述

yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils

报错如下：

Public key for package-name is not installed
GPG check FAILED

2.原因

• yum源更新后需要导入 key值，否则就会报上面的错误，无法安装相关的包。

3解决

• 办法
  • 加上【--nogpgcheck】
  • 去掉gpg检查

yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils --nogpgcheck