好像显示大致意思是说镜像地址不存在
Errors during downloading metadata for repository 'powertools':
- Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=PowerTools&infra=stock [Could not resolve host: mirrorlist.centos.org]
Error: Failed to download metadata for repo 'powertools': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=PowerTools&infra=stock [Could not resolve host: mirrorlist.centos.org]