Centos8 dnf update failed

 
[root@localhost ~]# dnf update 
CentOS-8 - AppStream 35 B/s | 38 B 00:01
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

Recently i wanted to install `screens` package and stumbled upon with the error above.
Solution was,

[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
[root@localhost yum.repos.d]# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

Reference from this article.
Hope it helps. 


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