【CentOS8】AppStreamのダウンロードエラー発生時の対処法

1
$ yum update
2
Failed to set locale, defaulting to C.UTF-8
3
CentOS Linux 8 - AppStream                                                              0.0  B/s |   0  B     00:00
4
Errors during downloading metadata for repository 'appstream':
5
  - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]
6
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]

1
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*;

1
sed -i 's|mirrorlist|#mirrorlist|g' /etc/yum.repos.d/CentOS-*;

1
cat /etc/yum.repos.d/CentOS-Linux-AppStream.repo | grep -e mirrorlist= -e baseurl=

1
mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
2
#baseurl=http://vault.centos.org/$contentdir/$releasever/AppStream/$basearch/os/

1
#mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
2
baseurl=http://vault.centos.org/$contentdir/$releasever/AppStream/$basearch/os/

1
$ yum update
2
Failed to set locale, defaulting to C.UTF-8
3
CentOS Linux 8 - AppStream                                                               11 MB/s | 8.4 MB     00:00
4
CentOS Linux 8 - BaseOS                                                                 5.4 MB/s | 4.6 MB     00:00
5
CentOS Linux 8 - Extras                                                                  50 kB/s |  10 kB     00:00
6
Dependencies resolved.
7
…