Linux系统内核升级

calendar 2022-02-08 · 阅读时长 1 分钟 · Linux kernel

脚本基于Centos 7

1、查看系统内核版本

1$ uname -r
23.10.0-514.26.2.el7.x86_64
3$ cat /etc/redhat-release 
4CentOS Linux release 7.6.1810 (Core)

2、升级内核

导入elrepo的key，然后安装elrepo的yum源

1$ rpm -import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2$ rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

查看可用的内核相关包

1$ yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

主分支ml(mainline)，稳定版(stable)，长期维护版lt(longterm) 安装内核

1$ yum -y --enablerepo=elrepo-kernel install kernel-ml.x86_64 kernel-ml-devel.x86_64

3、修改grub

 1# 查看系统内核列表
 2$ awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg
 3CentOS Linux (5.2.11-1.el7.elrepo.x86_64) 7 (Core) # 新内核（5.2.11）在0的位置上
 4CentOS Linux (3.10.0-957.27.2.el7.x86_64) 7 (Core)
 5CentOS Linux (3.10.0-514.26.2.el7.x86_64) 7 (Core)
 6CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)
 7CentOS Linux (0-rescue-963c2c41b08343f7b063dddac6b2e486) 7 (Core)
 8
 9$ vim /etc/default/grub
10#将 GRUB_DEFAULT=saved 改为 GRUB_DEFAULT=0
11
12# 重建内核配置
13$ grub2-mkconfig -o /boot/grub2/grub.cfg
14
15# or 使用第二种命令行方式，减少操作复杂度，减少出错机率
16
17# 查看系统内核列表
18$ cat /boot/grub2/grub.cfg | grep menuentry
19if [ x"${feature_menuentry_id}" = xy ]; then
20  menuentry_id_option="--id"
21  menuentry_id_option=""
22export menuentry_id_option
23menuentry 'CentOS Linux (6.2.2-1.el7.elrepo.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.81.1.el7.x86_64-advanced-fbc2582d-2e8a-4c41-8ba8-83656d8df89b' {
24menuentry 'CentOS Linux (3.10.0-1160.83.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.81.1.el7.x86_64-advanced-fbc2582d-2e8a-4c41-8ba8-83656d8df89b' {
25menuentry 'CentOS Linux (3.10.0-1160.81.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.81.1.el7.x86_64-advanced-fbc2582d-2e8a-4c41-8ba8-83656d8df89b' {
26menuentry 'CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-fbc2582d-2e8a-4c41-8ba8-83656d8df89b' {
27menuentry 'CentOS Linux (0-rescue-9745ea2ecc634c89aef55f4dc21ee8fc) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-9745ea2ecc634c89aef55f4dc21ee8fc-advanced-fbc2582d-2e8a-4c41-8ba8-83656d8df89b' {
28# 配置默认内核
29$ grub2-set-default "CentOS Linux (6.2.2-1.el7.elrepo.x86_64) 7 (Core)"
30# 验证修改结果
31$ grub2-editenv list
32saved_entry=CentOS Linux (6.2.2-1.el7.elrepo.x86_64) 7 (Core)

4、重启系统

1$ reboot
2
3#查看内核版本
4$ uname -r
55.2.11-1.el7.elrepo.x86_64

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