centos7 内核升级

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1.查看当前内核版本
   [iyunv@lvs-master ~]# uname -sr
    Linux 3.10.0-693.el7.x86_64
2.升级内核
2.1手动升级内核（速度慢）
官方网站查看最新内核    https://www.kernel.org/
下载最新内核    wget https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-4.16-rc5.tar.gz --no-check-certificate
安装基本工具和依赖包  yum -y groupinstall Development tools    yum -y install hmaccalc zlib-develbinutils-devel elfutils-libelf-devel bc openssl-devel
解压内核文件并进去   tar xvf linux-4.16-rc5.tar.gz && cd linux-4.16-rc5
      备份旧版内核配置文件   cp /boot/config-3.10.0-693.el7.x86_64 .config
开始编译内核  make  bzImage 开始编译，一路回车
编译安装   make    make modules   make modules_install   make install
查看当前系统拥有的内核  cat /boot/grub2/grub.cfg |grep menuentry
[iyunv@harbor harbor]# cat /boot/grub2/grub.cfg |grep menuentry
if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
  menuentry_id_option=""
export menuentry_id_option
menuentry 'CentOS Linux (4.4.121-1.el7.elrepo.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-693.el7.x86_64-advanced-b8598f63-2288-45a2-b0f0-db4c3bf7d8eb' {
menuentry 'CentOS Linux (4.12.0-rc5) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-693.el7.x86_64-advanced-b8598f63-2288-45a2-b0f0-db4c3bf7d8eb' {
menuentry 'CentOS Linux (3.10.0-693.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-693.el7.x86_64-advanced-b8598f63-2288-45a2-b0f0-db4c3bf7d8eb' {
menuentry 'CentOS Linux (0-rescue-9116b12f8a4f4457bda2d8778c16d8f2) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-9116b12f8a4f4457bda2d8778c16d8f2-advanced-b8598f63-2288-45a2-b0f0-db4c3bf7d8eb' {
设置默认启动内核   grub2-set-default 'CentOS Linux (4.4.121-1.el7.elrepo.x86_64) 7 (Core)'
查看内核修改结构   grub2-editenv list
重启系统即可加载新内核
2.2通过yum在线升级内核
登陆查看与自己系统匹配的源  http://elrepo.org/tiki/tiki-index.php
安装elrepo源  rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
查看可用软件包  yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
升级内核版本  yum --enablerepo=elrepo-kernel install kernel-lt
查看当前系统拥有的内核  cat /boot/grub2/grub.cfg |grep menuentry
设置默认启动内核   grub2-set-default 'CentOS Linux (4.4.121-1.el7.elrepo.x86_64) 7 (Core)'
查看内核修改结构   grub2-editenv list
重启系统即可加载新内核

查看已安装内核  rpm -qa |grep kernel
删除旧内核   yum -y remove kernel-3.10.0-693.el7.x86_64

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