centos在安装新内核后,会设置新内核为默认启动内核,有时候我们可能需要更改为其他内核,操作如下。
查看当前默认内核
输出结果
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| [root@localhost ~]# grubby --default-kernel /boot/vmlinuz-4.18.0-348.7.1.el8_5.x86_64
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查看所有内核
输出结果
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| [root@localhost ~]# grubby --info=ALL index=0 kernel="/boot/vmlinuz-4.18.0-348.7.1.el8_5.x86_64" args="ro crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet $tuned_params" root="/dev/mapper/cl-root" initrd="/boot/initramfs-4.18.0-348.7.1.el8_5.x86_64.img $tuned_initrd" title="CentOS Linux (4.18.0-348.7.1.el8_5.x86_64) 8" id="5aba21d384f845cbb93134cc471fe539-4.18.0-348.7.1.el8_5.x86_64" index=1 kernel="/boot/vmlinuz-4.18.0-348.2.1.el8_5.x86_64" args="ro crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet $tuned_params" root="/dev/mapper/cl-root" initrd="/boot/initramfs-4.18.0-348.2.1.el8_5.x86_64.img $tuned_initrd" title="CentOS Linux (4.18.0-348.2.1.el8_5.x86_64) 8" id="5aba21d384f845cbb93134cc471fe539-4.18.0-348.2.1.el8_5.x86_64" index=2 kernel="/boot/vmlinuz-4.18.0-240.1.1.el8_3.x86_64" args="ro crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet $tuned_params" root="/dev/mapper/cl-root" initrd="/boot/initramfs-4.18.0-240.1.1.el8_3.x86_64.img $tuned_initrd" title="CentOS Linux (4.18.0-240.1.1.el8_3.x86_64) 8" id="5aba21d384f845cbb93134cc471fe539-4.18.0-240.1.1.el8_3.x86_64" index=3 kernel="/boot/vmlinuz-4.18.0" args="ro crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet $tuned_params" root="/dev/mapper/cl-root" initrd="/boot/initramfs-4.18.0.img $tuned_initrd" title="CentOS Linux (4.18.0) 8" id="5aba21d384f845cbb93134cc471fe539-4.18.0" index=4 kernel="/boot/vmlinuz-0-rescue-5aba21d384f845cbb93134cc471fe539" args="ro crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet" root="/dev/mapper/cl-root" initrd="/boot/initramfs-0-rescue-5aba21d384f845cbb93134cc471fe539.img" title="CentOS Stream (0-rescue-5aba21d384f845cbb93134cc471fe539) 8" id="5aba21d384f845cbb93134cc471fe539-0-rescue"
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设置默认内核
比如我要设置成4.18.0内核
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| grubby --set-default /boot/vmlinuz-4.18.0
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这样就设置好了