无法在CentOS8手动安装时更新yum，但浏览器已连接到internet

Question

[root@localhost san]# yum update
CentOS-8 - AppStream                            0.0  B/s |   0  B     00:30    
CentOS-8 - Base                                 0.0  B/s |   0  B     00:30    
CentOS-8 - Extras                               0.0  B/s |   0  B     00:30    
Failed to synchronize cache for repo 'AppStream', ignoring this repo.
Failed to synchronize cache for repo 'BaseOS', ignoring this repo.
Failed to synchronize cache for repo 'extras', ignoring this repo.
Dependencies resolved.
Nothing to do.
Complete!
[root@localhost san]# 

Answer 1

代理是问题所在！忘记为所有bash用户添加代理