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Había instalado un CentOS 8 minimalista en uno de mis servidores. Sin embargo, la instalación se realizó correctamente cuando intenté actualizar el sistema usando yum updateVeo este mensaje de error: Error al descargar los metadatos para el repositorio. A continuación se muestra el error completo.

[root@autocontroller ~]# yum update
CentOS-8 - AppStream 70 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

Salida de /var/log/dnf.logpara obtener más información de DEPURACIÓN:

2022-02-02T11:39:36Z DEBUG error: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org] (http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock).
2022-02-02T11:39:36Z WARNING Errors during downloading metadata for repository 'AppStream':
- Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]
2022-02-02T11:39:36Z DDEBUG Cleaning up.
2022-02-02T11:39:36Z SUBDEBUG
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 573, in load
ret = self._repo.load()
File "/usr/lib64/python3.6/site-packages/libdnf/repo.py", line 394, in load
return _repo.Repo_load(self)
RuntimeError: 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=stock [Could not resolve host: mirrorlist.centos.org]

Pero, luego verificado con la conexión a Internet y DNS y funciona bien como se muestra a continuación:

[root@autocontroller ~]# ping google.com
PING google.com (172.217.166.206) 56(84) bytes de datos.
64 bytes desde del03s13-in-f14.1e100.net (172.217.166.206): icmp_seq=1 ttl=115 ti me=43.5 ms
--- estadísticas de ping de google.com ---
1 paquetes transmitidos, 1 recibido, 0% pérdida de paquetes, tiempo 0ms
rtt min/avg/max/mdev = 43,508/43,508/43,508/0,000 ms

Entonces, ¿cómo solucioné el problema? Aquí está.

CentOS Linux 8 había llegado al final de su vida útil (EOL) el 31 de diciembre de 2021. Significa que CentOS 8 ya no recibirá recursos de desarrollo del proyecto oficial de CentOS. Después del 31 de diciembre de 2021, si necesita actualizar su CentOS, debe cambiar los espejos a vault.centos.org , donde se archivarán de forma permanente. Alternativamente, es posible que desee actualizar a CentOS Stream .

Paso 1: Ir al /etc/yum.repos.d/directorio.

[root@autocontroller ~]# cd /etc/yum.repos.d/

Paso 2: ejecuta los siguientes comandos (Que detellamos aquí, para mayor control: Cambiar el contenido interno de muchos ficheros a la vez, con sólo un comando, en Linux

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

Paso 3: ahora ejecuta la actualización de yum

[root@autocontroller ~]# yum update -y

Y ya está!

Y así es como debe quedar:

root@ns3155835 yum.repos.d]# ll
total 48
-rw-r--r--. 1 root root  718 may 23 05:02 CentOS-Linux-AppStream.repo
-rw-r--r--. 1 root root  703 may 23 05:02 CentOS-Linux-BaseOS.repo
-rw-r--r--. 1 root root 1129 may 23 05:02 CentOS-Linux-ContinuousRelease.repo
-rw-r--r--. 1 root root  318 sep 15  2021 CentOS-Linux-Debuginfo.repo
-rw-r--r--. 1 root root  731 may 23 05:02 CentOS-Linux-Devel.repo
-rw-r--r--. 1 root root  703 may 23 05:02 CentOS-Linux-Extras.repo
-rw-r--r--. 1 root root  718 may 23 05:02 CentOS-Linux-FastTrack.repo
-rw-r--r--. 1 root root  739 may 23 05:02 CentOS-Linux-HighAvailability.repo
-rw-r--r--. 1 root root  693 sep 15  2021 CentOS-Linux-Media.repo
-rw-r--r--. 1 root root  705 may 23 05:02 CentOS-Linux-Plus.repo
-rw-r--r--. 1 root root  723 may 23 05:02 CentOS-Linux-PowerTools.repo
-rw-r--r--. 1 root root 1124 sep 15  2021 CentOS-Linux-Sources.repo
[root@ns3155835 yum.repos.d]# 
[root@ns3155835 yum.repos.d]# 
[root@ns3155835 yum.repos.d]# cat *

= = = = = = = = = = = = = = = 01 = = = = = = = = = = = = = = =

# CentOS-Linux-AppStream.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[appstream]
name=CentOS Linux $releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 02 = = = = = = = = = = = = = = =

# CentOS-Linux-BaseOS.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[baseos]
name=CentOS Linux $releasever - BaseOS
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 03 = = = = = = = = = = = = = = =

# CentOS-Linux-ContinuousRelease.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.
#
# The Continuous Release (CR) repository contains packages for the next minor
# release of CentOS Linux.  This repository only has content in the time period
# between an upstream release and the official CentOS Linux release.  These
# packages have not been fully tested yet and should be considered beta
# quality.  They are made available for people willing to test and provide
# feedback for the next release.

[cr]
name=CentOS Linux $releasever - ContinuousRelease
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=cr&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/cr/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 04 = = = = = = = = = = = = = = =

# CentOS-Linux-Debuginfo.repo
#
# All debug packages are merged into a single repo, split by basearch, and are
# not signed.

[debuginfo]
name=CentOS Linux $releasever - Debuginfo
baseurl=http://debuginfo.centos.org/$releasever/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 05 = = = = = = = = = = = = = = =

# CentOS-Linux-Devel.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[devel]
name=CentOS Linux $releasever - Devel WARNING! FOR BUILDROOT USE ONLY!
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=Devel&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/Devel/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 06 = = = = = = = = = = = = = = =

# CentOS-Linux-Extras.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[extras]
name=CentOS Linux $releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/extras/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 07 = = = = = = = = = = = = = = =

# CentOS-Linux-FastTrack.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[fasttrack]
name=CentOS Linux $releasever - FastTrack
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=fasttrack&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/fasttrack/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 08 = = = = = = = = = = = = = = = 

# CentOS-Linux-HighAvailability.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[ha]
name=CentOS Linux $releasever - HighAvailability
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=HighAvailability&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/HighAvailability/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 09 = = = = = = = = = = = = = = =

# CentOS-Linux-Media.repo
#
# You can use this repo to install items directly off the installation media.
# Verify your mount point matches one of the below file:// paths.

[media-baseos]
name=CentOS Linux $releasever - Media - BaseOS
baseurl=file:///media/CentOS/BaseOS
        file:///media/cdrom/BaseOS
        file:///media/cdrecorder/BaseOS
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[media-appstream]
name=CentOS Linux $releasever - Media - AppStream
baseurl=file:///media/CentOS/AppStream
        file:///media/cdrom/AppStream
        file:///media/cdrecorder/AppStream
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 10 = = = = = = = = = = = = = = =

# CentOS-Linux-Plus.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[plus]
name=CentOS Linux $releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/centosplus/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 11 = = = = = = = = = = = = = = =

# CentOS-Linux-PowerTools.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.

[powertools]
name=CentOS Linux $releasever - PowerTools
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=PowerTools&infra=$infra
baseurl=http://vault.centos.org/$contentdir/$releasever/PowerTools/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

= = = = = = = = = = = = = = = 12 = = = = = = = = = = = = = = =

# CentOS-Linux-Sources.repo

[baseos-source]
name=CentOS Linux $releasever - BaseOS - Source
baseurl=http://vault.centos.org/$contentdir/$releasever/BaseOS/Source/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[appstream-source]
name=CentOS Linux $releasever - AppStream - Source
baseurl=http://vault.centos.org/$contentdir/$releasever/AppStream/Source/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[powertools-source]
name=CentOS Linux $releasever - PowerTools - Source
baseurl=http://vault.centos.org/$contentdir/$releasever/PowerTools/Source/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[extras-source]
name=CentOS Linux $releasever - Extras - Source
baseurl=http://vault.centos.org/$contentdir/$releasever/extras/Source/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[plus-source]
name=CentOS Linux $releasever - Plus - Source
baseurl=http://vault.centos.org/$contentdir/$releasever/centosplus/Source/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
[root@ns3155835 yum.repos.d]# 
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