linux升级内核及设置默认内核

安装2个rpm

kernel-2.6.32...rpm

kernel-firmware-2.6.32...rpm

Linux 修改默认启动内核

vi /boot/grub/grub.conf

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#boot=/dev/sda
default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.17.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.17.1.el5 ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.18-194.17.1.el5.img
title CentOS (2.6.18-194.17.1.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-194.17.1.el5
        module /vmlinuz-2.6.18-194.17.1.el5xen ro root=LABEL=/ rhgb quiet
        module /initrd-2.6.18-194.17.1.el5xen.img
title CentOS (2.6.18-194.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-194.el5
        module /vmlinuz-2.6.18-194.el5xen ro root=LABEL=/ rhgb quiet
        module /initrd-2.6.18-194.el5xen.img
title CentOS-base (2.6.18-194.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.el5 ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.18-194.el5.img

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默认由0开始计数，因此须将default值改为0即可。