CentOS yum配置

• /etc/yun.repos.d
  清华源：
  https://mirror.tuna.tsinghua.edu.cn/help/centos/

yum clean all
yum makecache

• /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
  source: https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7

rpm --import RPM-GPG-KEY-CentOS-7
//test
yum install vim

opts：

• proxy
  • /etc/profile

vim /etc/profile
export http_proxy=xxx
export https_proxy=xxx
// :!wq
source /etc/profile

• /etc/yum.conf

vim /etc/yum.conf
proxy=xxx
//:!wq