CentOS上安装GCC报错：Failed to downloa

为了测试需要，要使用Docker的CentOS ：

docker run centos

CentOS 里面没有安装 GCC，使用下面的命令来安装：

#  cat /etc/redhat-release
CentOS Linux release 8.4.2105

# yum -y install gcc gcc-c++ autoconf make

却报下面的错：

Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

报错原因是 CentOS 已经停止维护，使用下面的命令可以解决：

# sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

参考
https://www.cnblogs.com/yu121/p/16597175.html
https://www.cnblogs.com/goodgongdstudy/p/16596280.html