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01升级内核.md

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离线升级

下载 kernel rpm lt 包

  1. 下载必须文件
# tree kernel/
kernel/
├── kernel-lt-5.4.278-1.el7.elrepo.x86_64.rpm
├── kernel-lt-devel-5.4.278-1.el7.elrepo.x86_64.rpm
├── kernel-lt-doc-5.4.278-1.el7.elrepo.noarch.rpm
├── kernel-lt-headers-5.4.278-1.el7.elrepo.x86_64.rpm
├── kernel-lt-tools-5.4.278-1.el7.elrepo.x86_64.rpm
├── kernel-lt-tools-libs-5.4.278-1.el7.elrepo.x86_64.rpm
├── kernel-lt-tools-libs-devel-5.4.278-1.el7.elrepo.x86_64.rpm
├── perf-5.4.278-1.el7.elrepo.x86_64.rpm
└── python-perf-5.4.278-1.el7.elrepo.x86_64.rpm
  1. 查看内核列表
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
  1. 安装
yum localinstall kernel-lt-5.4.278-1.el7.elrepo.x86_64.rpm
  1. 重建内核
grub2-mkconfig -o /boot/grub2/grub.cfg
  1. 配置新版内核
sed -i "s/GRUB_DEFAULT=saved/GRUB_DEFAULT=0/g" /etc/default/grub
  1. 重启

el7在线升级稳定版内核

导入public key,添加扩展源

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm -y

安装最新稳定版

yum -y --enablerepo=elrepo-kernel install kernel-lt.x86_64 kernel-lt-devel.x86_64

删除旧版本工具包

yum remove kernel-tools-libs.x86_64 kernel-tools.x86_64 -y

安装新版本工具包

yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-lt-tools.x86_64

查看内核列表

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

重建内核

grub2-mkconfig -o /boot/grub2/grub.cfg

配置新版内核

sed -i "s/GRUB_DEFAULT=saved/GRUB_DEFAULT=0/g" /etc/default/grub

重启

reboot

删除旧版本内核

oldkernel=`rpm -qa|grep kernel-[0-9]` && yum remove -y $oldkernel

el7在线升级主线版内核

导入public key,添加扩展源

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm -y

安装最新主线版

yum -y --enablerepo=elrepo-kernel install kernel-ml.x86_64 kernel-ml-devel.x86_64

删除旧版本工具包

rpm -qa|grep kernel-3|xargs -n1 rpm -e
rpm -e  kernel-tools-libs-*

安装新版本工具包

yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml-tools.x86_64

查看内核列表

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

重建内核

grub2-mkconfig -o /boot/grub2/grub.cfg

配置新版内核

grub2-set-default 0

系统盘非raid模式直接重启

reboot

trouble shooting

pstore: unknown compression: deflate 启动异常

修改引导配置

vim /etc/default/grub

在GRUB_CMDLINE_LINUX最后添加mgag200.modeset=0

配置样例

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto spectre_v2=retpoline rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet mgag200.modeset=0"
GRUB_DISABLE_RECOVERY="true"

重新生成引导文件

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg