centos5yum报错问题

本文介绍了解决CentOS 5.5版本中yum命令无法正常工作的问题。由于CentOS 5版本较老且不再受官方支持,原有的yum源已失效。通过修改/etc/yum.repos.d/CentOS-Base.repo文件中的url指向到CentOS Vault,成功解决了这一问题。

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今天需要用CentOS5.5测试个东西,但是发现在运行yum命令的时候出现下面的错误

Loaded plugins: allowdowngrade, downloadonly, fastestmirror
Determining fastest mirrors
Error: Cannot find a valid baseurl for repo: addons
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/addons/mirrorlist.txt

出现这个问题的原因CentOS5版本太老,官方不再维护了,所以yum默认配置文件中的url不能再使用。

因此,需要把/etc/yum.repos.d/CentOS-Base.repo文件中的url修改了

下面是修改前的配置

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# 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, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons
#baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

下面是修改后的配置

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# 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, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-5.9 - Base
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=os
baseurl=http://vault.centos.org/5.9/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-5.9 - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=updates
baseurl=http://vault.centos.org/5.9/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-5.9 - Addons
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=addons
baseurl=http://vault.centos.org/5.9/addons/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-5.9 - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=extras
baseurl=http://vault.centos.org/5.9/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5.9 - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=centosplus
baseurl=http://vault.centos.org/5.9/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-5.9 - Contrib
#mirrorlist=http://mirrorlist.centos.org/?release=5.9&arch=$basearch&repo=contrib
baseurl=http://vault.centos.org/5.9/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

修改后,重新使用yum来安装包,一切可以正常工作了。

本文转自激情燃烧的岁月博客51CTO博客,原文链接http://blog.51cto.com/liuzhengwei521/2051081如需转载请自行联系原作者


weilovepan520

### 解决 CentOS 6 中 `yum` 命令出现的错误 当遇到 `Depsolving loop limit reached` 错误时,这通常意味着依赖关系解析过程中出现了循环或者复杂的依赖链超过了默认的最大迭代次数[^1]。 为了处理这个问题,可以尝试以下几个方法: #### 方法一:清理并重置 Yum 缓存 有时缓存中的元数据可能已经损坏或过期。通过清除这些文件可以让Yum重新下载最新的信息。 ```bash sudo yum clean all ``` #### 方法二:调整配置参数 如果确实存在非常复杂的关系网,则可以通过修改 `/etc/yum.conf` 文件来增加最大循环限制: ```ini max_repos_with_same_url=50 tsflags=nodocs obsoletes=1 retries=20 timeout=30 metadata_expire=86400 group_package_types=default,optional installonly_limit=5 protected_multilib=true best=True skip_broken=False ``` 其中特别注意 `max_repos_with_same_url` 和 `retries` 参数,适当提高它们可以帮助解决问题。 #### 方法三:更换镜像源 对于较旧版本的操作系统来说,官方支持可能会停止更新,因此建议切换到更稳定的第三方仓库或是使用Vault库作为替代方案[^4]。编辑 `/etc/yum.repos.d/CentOS-Base.repo` 并替换为可靠的国内镜像地址,比如阿里云、腾讯云等提供的服务。 #### 方法四:检查网络连接状况 确保主机能够正常访问互联网以及指定的镜像站点。如果有防火墙或其他安全策略阻止了必要的通信,请相应地做出调整。 #### 方法五:升级至更高版本的 CentOS 或其他发行版 考虑到长期维护和支持的因素,在条件允许的情况下考虑迁移至更新的Linux平台可能是更好的选择。 ```python import platform def check_os_version(): os_info = platform.linux_distribution() major_version = int(os_info[1].split('.')[0]) if major_version < 7: print("当前操作系统版本较低,推荐升级.") else: print(f"当前操作系统版本 {major_version} 是合适的.") check_os_version() ```
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