grubby¶
grubby 是一个命令行工具，用于更新和显示有关 grub2 和 zipl 引导加载程序的配置文件的信息。它主要设计用于安装新内核并需要查找有关当前引导环境的信息的脚本。同时也可以对启动内核的各项信息参数进行修改。
1、安装
rpm -Uvh *.rpm
grubby --default-kernel
3、查看系统安装的全部内核：
grubby --info=ALL
index=0
kernel="/boot/vmlinuz-5.14.0-162.6.1.el9_1.x86_64"
args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M rd.lvm.lv=rl_devmaster1/root net.ifnames=0"
root="/dev/mapper/rl_devmaster1-root"
initrd="/boot/initramfs-5.14.0-162.6.1.el9_1.x86_64.img"
title="Rocky Linux (5.14.0-162.6.1.el9_1.x86_64) 9.1 (Blue Onyx)"
id="a98618aa1631441dbb52c75a50834a0a-5.14.0-162.6.1.el9_1.x86_64"
index=1
kernel="/boot/vmlinuz-5.14.0-70.30.1.el9_0.x86_64"
args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M rd.lvm.lv=rl_devmaster1/root net.ifnames=0"
root="/dev/mapper/rl_devmaster1-root"
initrd="/boot/initramfs-5.14.0-70.30.1.el9_0.x86_64.img"
title="Rocky Linux (5.14.0-70.30.1.el9_0.x86_64) 9.0 (Blue Onyx)"
id="a98618aa1631441dbb52c75a50834a0a-5.14.0-70.30.1.el9_0.x86_64"
index=2
kernel="/boot/vmlinuz-5.14.0-70.22.1.el9_0.x86_64"
args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M rd.lvm.lv=rl_devmaster1/root net.ifnames=0"
root="/dev/mapper/rl_devmaster1-root"
initrd="/boot/initramfs-5.14.0-70.22.1.el9_0.x86_64.img"
title="Rocky Linux (5.14.0-70.22.1.el9_0.x86_64) 9.0 (Blue Onyx)"
id="a98618aa1631441dbb52c75a50834a0a-5.14.0-70.22.1.el9_0.x86_64"
index=3
kernel="/boot/vmlinuz-0-rescue-a98618aa1631441dbb52c75a50834a0a"
args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M rd.lvm.lv=rl_devmaster1/root net.ifnames=0"
root="/dev/mapper/rl_devmaster1-root"
initrd="/boot/initramfs-0-rescue-a98618aa1631441dbb52c75a50834a0a.img"
title="Rocky Linux (0-rescue-a98618aa1631441dbb52c75a50834a0a) 9.0 (Blue Onyx)"
id="a98618aa1631441dbb52c75a50834a0a-0-rescue"
4、查看特定内核的具体信息：
grubby --info=/boot/vmlinuz-5.14.0-70.30.1.el9_0.x86_64
5、设置新的默认启动内核：
- 使用路径来指定内核，可以使用 --set-default=kernel-path
grubby --set-default=/boot/vmlinuz-5.14.0-70.30.1.el9_0.x86_64
grubby --default-kernel
- 使用 index 来指定内核，则使用 --set-default-index=entry-index
grubby --set-default-index=1
grubby --default-kernel
6、从启动项中删除旧内核（可选）
grubby --remove-kernel=/boot/vmlinuz-4.18.0-348.el8.x86_64