【Linux#2】CentOSでyumエラーが出た場合の対処方法

概要

yumコマンドを実行した際、http://～ Not Foundのようなエラーが発生した場合の対処方法。

内容

エラー内容

$ yum list
読み込んだプラグイン:fastestmirror, langpacks
Determining fastest mirrors
http://mirror.centos.org/centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
他のミラーを試します。
To address this issue please refer to the below wiki article

https://wiki.centos.org/yum-errors

If above article doesn't help to resolve this issue please use https://bugs.centos.org/.



 One of the configured repositories failed (CentOS-7 - Extras),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=extras ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable extras
        or
            subscription-manager repos --disable=extras

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=extras.skip_if_unavailable=true

failure: repodata/repomd.xml from extras: [Errno 256] No more mirrors to try.
http://mirror.centos.org/centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found

原因

サポート終了などの古いCentOSの場合に、データ取得先のURLが見つからないということ。

対処方法

以下のディレクトリにあるyumリポジトリの設定ファイルを開き、baseurlをvault.centos.orgに変更する。
vault.centos.orgは、サポート終了などによる過去のCentOSのパッケージを保管しているアーカイブサイト。

$ vi /etc/yum.repos.d/CentOS-Base.repo

[base]
name=CentOS-$releasever - Base
#mirrorlist=http://vault.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=http://vault.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled = 0
skip_if_unavailable = 1
keepcache = 0

#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://vault.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=http://vault.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://vault.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
baseurl=http://vault.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://vault.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
baseurl=http://vault.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

yumのキャッシュをクリアしてから、再度yumコマンドを実行。

$ yum clean all

補足

yum info centos-releaseで、$releaseverや$basearchの値を確認できる。

$ yum info centos-release
読み込んだプラグイン:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
インストール済みパッケージ
名前                : centos-release
アーキテクチャー    : x86_64
バージョン          : 7
リリース            : 9.2009.1.el7.centos
容量                : 44 k
リポジトリー        : installed
提供元リポジトリー  : anaconda
要約                : CentOS Linux release file
ライセンス          : GPLv2
説明                : CentOS Linux release files

利用可能なパッケージ
名前                : centos-release
アーキテクチャー    : x86_64
バージョン          : 7
リリース            : 9.2009.2.el7.centos
容量                : 27 k
リポジトリー        : updates/7/x86_64
要約                : CentOS Linux release file
ライセンス          : GPLv2
説明                : CentOS Linux release files