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https://blog.offline-net.com/2008/05/05/linux-yum%e9%80%9f%e3%81%84%e3%83%aa%e3%83%9d%e3%82%b8%e3%83%88%e3%83%aa%e3%82%92%e8%87%aa%e5%8b%95%e9%81%b8%e6%8a%9e%e3%81%99%e3%82%8b/
Linux: yum速いリポジトリを自動選択する