Fedora清除舊內核，方法如下：
1. 查看當前系統中已安裝的內核相關包：
[iceting@localhost ~]$ rpm -qa |grep kernel
abrt-addon-kerneloops-2.2.0-1.fc20.x86_64
kernel-headers-3.13.10-200.fc20.x86_64
libreport-plugin-kerneloops-2.2.1-1.fc20.x86_64
kernel-debug-devel-3.13.10-200.fc20.x86_64
kernel-3.13.10-200.fc20.x86_64
kernel-modules-extra-3.11.10-301.fc20.x86_64
kernel-modules-extra-3.13.10-200.fc20.x86_64
kernel-3.11.10-301.fc20.x86_64
2.查看當前系統內核
[iceting@localhost ~]$ sudo uname -r
3.13.10-200.fc20.x86_64
3. 確定要刪除的內核：
這裏爲：kernel-3.11.10-301.fc20.x86_64
4. 刪除內核：
[iceting@localhost ~]$ sudo yum remove kernel-3.11.10-301.fc20.x86_64
已加載插件：langpacks, refresh-packagekit
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository fedora-source is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-debuginfo is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-debuginfo is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository fedora-source is listed more than once in the configuration
正在解決依賴關係
--> 正在檢查事務
---> 軟件包 kernel.x86_64.0.3.11.10-301.fc20 將被 刪除
--> 正在處理依賴關係 kernel-uname-r = 3.11.10-301.fc20.x86_64，它被軟件包 kernel-modules-extra-3.11.10-301.fc20.x86_64 需要
--> 正在檢查事務
---> 軟件包 kernel-modules-extra.x86_64.0.3.11.10-301.fc20 將被 刪除
--> 解決依賴關係完成
依賴關係解決
================================================================================
Package 架構 版本 源 大小
================================================================================
正在刪除:
kernel x86_64 3.11.10-301.fc20 @anaconda 128 M
爲依賴而移除:
kernel-modules-extra x86_64 3.11.10-301.fc20 @anaconda 8.1 M
事務概要
================================================================================
移除 1 軟件包 (+1 依賴軟件包)
安裝大小：136 M
是否繼續？[y/N]：y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
正在刪除 : kernel-modules-extra-3.11.10-301.fc20.x86_64 1/2
正在刪除 : kernel-3.11.10-301.fc20.x86_64 2/2
驗證中 : kernel-modules-extra-3.11.10-301.fc20.x86_64 1/2
驗證中 : kernel-3.11.10-301.fc20.x86_64 2/2
刪除:
kernel.x86_64 0:3.11.10-301.fc20
作爲依賴被刪除:
kernel-modules-extra.x86_64 0:3.11.10-301.fc20
完畢！
[iceting@localhost ~]$
沒有直接使用: rpm -e 的方法刪除內核包， 而是使用 yum remove 進行刪除，
因爲使用yum remove刪除， yum 會自動移除 ： /boot/grub/menu.lst 中的相關啓動項。