yum/dnf: 报错：Error: Cannot find a valid baseurl for repo: crb

一，报错信息：

# yum config-manager --set-enabled crb
# yum repolist
repo id                                                                                    repo name
appstream                                                                                  CentOS Stream 9 - AppStream
baseos                                                                                     CentOS Stream 9 - BaseOS
crb                                                                                        CentOS Stream 9 - CRB
epel                                                                                       Extra Packages for Enterprise Linux 9 - x86_64
epel-cisco-openh264                                                                        Extra Packages for Enterprise Linux 9 openh264 (From Cisco) - x86_64
epel-next                                                                                  Extra Packages for Enterprise Linux 9 - Next - x86_64
extras-common                                                                              CentOS Stream 9 - Extras packages
mysql-8.4-lts-community                                                                    MySQL 8.4 LTS Community Server
mysql-connectors-community                                                                 MySQL Connectors Community
mysql-tools-8.4-lts-community                                                              MySQL Tools 8.4 LTS Community
# yum search libzip
Error: Cannot find a valid baseurl for repo: crb

二，原因:

# more centos.repo

。。。

[crb]
name=CentOS Stream $releasever - CRB
#metalink=https://mirrors.centos.org/metalink?repo=centos-crb-$stream&arch=$basearch&protocol=https,http
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

确实crb缺少默认的baseurl

三，解决:

# vi /etc/yum.repos.d/centos.repo

修改后内容:

[crb]
name=CentOS Stream $releasever - CRB
#metalink=https://mirrors.centos.org/metalink?repo=centos-crb-$stream&arch=$basearch&protocol=https,http
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-stream/$releasever-stream/CRB/$basearch/os
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=1

测试效果:

# yum search libzip
CentOS Stream 9 - CRB                                                                                                     53 MB/s | 7.4 MB     00:00
Last metadata expiration check: 0:00:01 ago on Fri 09 Jan 2026 11:12:43 PM CST.
=================================================== Name Exactly Matched: libzip ==========================
libzip.i686 : C library for reading, creating, and modifying zip archives
============================================ Name & Summary Matched: libzip =========================
libzip-devel.x86_64 : Development files for libzip
libzip-devel.i686 : Development files for libzip
libzip-tools.x86_64 : Command line tools from libzip