RHEL 升级内核和回退步骤

RHEL 升级内核和回退步骤

从redhat官网上下载内核kernel和kernel-firmware

将软件包上传到linux

[root@oracle ~]# yum install kernel-2.6.32-754.23.1.el6.x86_64.rpm kernel-firmware-2.6.32-754.23.1.el6.noarch.rpm

推荐使用yum升级

然后修改默认的启动内核

[root@oracle ~]# vim /etc/grub.conf

[root@oracle ~]# vim /etc/grub.conf
#grub.conf generated by anaconda

#Note that you do not have to rerun grub after making changes to this file
#NOTICE: You have a /boot partition. This means that
#all kernel and initrd paths are relative to /boot/, eg.
#root (hd0,0)
#kernel /vmlinuz-version ro root=/dev/mapper/vg_oracle-lv_root
#initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux Server (2.6.32-754.23.1.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-754.23.1.el6.x86_64 ro root=/dev/mapper/vg_oracle-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_oracle/lv_root rd_NO_MD rd_LVM_LV=vg_oracle/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=deadline
initrd /initramfs-2.6.32-754.23.1.el6.x86_64.img
title Red Hat Enterprise Linux 6 (2.6.32-642.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=/dev/mapper/vg_oracle-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_oracle/lv_root rd_NO_MD rd_LVM_LV=vg_oracle/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=deadline
initrd /initramfs-2.6.32-642.el6.x86_64.img
default=0表示默认的启动内核是第一个，也就是新安装的2.6.32-754.23.1

然后重启服务器，确认新内核是第一位，并从新内核正常启动。

卸载

假如发现新内核不合适，那么需要切换到旧内核，使用yum卸载

[root@oracle ~]# rpm -qa |grep kernel
kernel-devel-2.6.32-642.el6.x86_64
dracut-kernel-004-409.el6.noarch
kernel-2.6.32-642.el6.x86_64
kernel-headers-2.6.32-642.el6.x86_64
kernel-2.6.32-754.23.1.el6.x86_64
abrt-addon-kerneloops-2.0.8-40.el6.x86_64
kernel-firmware-2.6.32-754.23.1.el6.noarch
libreport-plugin-kerneloops-2.0.9-32.el6.x86_64
[root@oracle ~]# yum remove kernel-2.6.32-754.23.1.el6.x86_64 kernel-firmware-2.6.32-754.23.1.el6.noarch
然后从本地yum源中重新安装kernel-firmware

[root@oracle ~]# yum install kernel-firmware kernel
再次重启，发现默认内核回去了，并且/etc/grub.conf 变回去了