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CentOS7.6编译升级Linux内核

  • 2026-02-26 00:55:46
CentOS7.6编译升级Linux内核

1、下载内核

Linux内核官网: http://www.kernel.org

这里我选择的内核版本为:5.10.x

内核下载地址:

https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.248.tar.xz

2、升级前准备

(1)查看当前系统内核版本

使用uname -r 命令查看当前系统内核版本,当前内核版本:3.10.0

(2)安装必要的软件包

确认是否安装gcc,ncurses-devel, bc, openssl-devel, elfutils-libelf-devel, bison, flex, perl 这几个软件包,如未安装则需要提前安装一下。

服务器无法联网的情况下,需要挂载ISO镜像后,再使用YUM命令进行安装。

yum install gcc gcc-c++ ncurses-devel bc openssl-devel elfutils-libelf-devel bison flex perl wget -y

3、升级gcc

升级5.10.x及以上版本时,需要高版本的gcc。

# 1. 安装编译依赖

yum install gcc gcc-c++ ncurses-devel bc openssl-devel elfutils-libelf-devel bison flex perl wget lbzip2 -y

# 2. 下载 GCC 8.5.0

cd /usr/srcwget https://ftp.gnu.org/gnu/gcc/gcc-8.5.0/gcc-8.5.0.tar.gztar xf gcc-8.5.0.tar.gzcd gcc-8.5.0

# 3. 下载依赖

./contrib/download_prerequisites

# 4. 配置和编译

mkdir buildcd build../configure --prefix=/usr/local/gcc-8.5.0 --enable-languages=c,c++ --disable-multilib --disable-bootstrapmake -j$(nproc)

# 5. 安装

make install

# 6. 设置环境变量

echo 'export PATH=/usr/local/gcc-8.5.0/bin:$PATH' >> /etc/profileecho 'export LD_LIBRARY_PATH=/usr/local/gcc-8.5.0/lib64:$LD_LIBRARY_PATH' >> /etc/profilesource /etc/profile

# 7. 创建符号链接

rm -rf /usr/bin/gcc-9rm -rf /usr/bin/g++-9ln -sf /usr/local/gcc-8.5.0/bin/gcc /usr/bin/gcc-8ln -sf /usr/local/gcc-8.5.0/bin/g++ /usr/bin/g++-8

8. 查看版本:

gcc --version

4、开始安装

4.1 解压内核

tar -xf linux-5.10.248.tar.xz -C /usr/src

4.2 进入解压后的内核目录

cd /usr/src/linux-5.10.248/

4.3 清除变量

make mrproper    #执行该命令清除环境变量,即清除配置文件

4.4 选择需要编译的内核模块

make menuconfig    #执行该命令在菜单模式下选择需要编译的内核模块,如果没有特殊要求,则不用进行配置,保持默认配置即可,这里直接Save了

直接OK

保存完毕后(100%),Exit退出

更新配置:

make olddefconfig

4.5 编译安装内核

这里等待编译完成即可,需要时间比较长,主要看服务器配置,如果服务器配置太低,可能需要花费几个小时才完成,所以最好不要使用SSH远程执行该命令,远程终端可能不稳定导致中断。

使用make时添加-j参数,指定用来编译的CPU核数:

make -j$(nproc)

编译正常通过:

make modules_install
make install

编译完成后,会自动在/boot目录下生成相应的文件:

如果没有自动生成,可以执行下面命令:

cp /usr/src/linux-5.10.248/arch/x86/boot/bzImage /boot/vmlinuz-5.10.248cp /usr/src/linux-5.10.248/System.map /boot/System.map-5.10.248mkinitrd /boot/initramfs-5.10.248.img 5.10.248    #根据内核版本和指定参数生成映像文件

5、修改启动文件

修改启动文件,将新内核加入启动列表。

查看/boot/grub2/grub.cfg文件会发现新内核已在其中,以下为部分截图:

cat /boot/grub2/grub.cfg
menuentry 'CentOS Linux (5.10.248) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-957.el7.x86_64-advanced-833ce548-7b73-442f-8135-b88017fc4527' {    load_video    set gfxpayload=keep    insmod gzio    insmod part_msdos    insmod xfs    set root='hd0,msdos1'    if [ x$feature_platform_search_hint = xy ]; then      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  4ac17cac-fb1d-4441-9e9b-dbdab3d63a81    else      search --no-floppy --fs-uuid --set=root 4ac17cac-fb1d-4441-9e9b-dbdab3d63a81    fi    linux16 /vmlinuz-5.10.248 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=en_US.UTF-8    initrd16 /initramfs-5.10.248.img}

修改默认启动文件

vi /etc/default/grub

将:GRUB_DEFAULT=saved改为:GRUB_DEFAULT=0

使其配置文件生效

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

配置文件生效后,grub文件会有所变化:

执行命令前:

执行命令后:

6、重启服务器验证

重启服务器以新内核启动并验证内核是否升级成功。

启动时,可以看到新版本内核了:

登录到系统验证:

7、问题

/lib/modules/5.10.248/kernel  目录占用空间特别大。

因为我们在编译内核的时候,使用的是默认编译,其中像gpu、media、bluetooth等驱动根本不需要安装。

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  1. CONNECT:[ UseTime:0.000895s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001296s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001631s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000796s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001633s ]
  6. SELECT * FROM `set` [ RunTime:0.000666s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001464s ]
  8. SELECT * FROM `article` WHERE `id` = 476801 LIMIT 1 [ RunTime:0.001116s ]
  9. UPDATE `article` SET `lasttime` = 1772312637 WHERE `id` = 476801 [ RunTime:0.002001s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000602s ]
  11. SELECT * FROM `article` WHERE `id` < 476801 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001169s ]
  12. SELECT * FROM `article` WHERE `id` > 476801 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001093s ]
  13. SELECT * FROM `article` WHERE `id` < 476801 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004270s ]
  14. SELECT * FROM `article` WHERE `id` < 476801 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002391s ]
  15. SELECT * FROM `article` WHERE `id` < 476801 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003167s ]
0.210667s