Compile and install the latest Linux Kernel 6.0 rc3 on CentOS7
哪个男孩不想手动编译一份自己的内核呢?

安装编译环境
CentOS7安装必要的包
yum groupinstall "Development Tools" -y && yum install openssl-devel -y && yum install rpm-build redhat-rpm-config asciidoc hmaccalc perl-ExtUtils-Embed pesign xmlto -y && yum install audit-libs-devel binutils-devel elfutils-devel elfutils-libelf-devel -y && yum install ncurses-devel newt-devel numactl-devel pciutils-devel python-devel zlib-devel -y
CentOS7更新gcc版本
必须升级gcc版本,centOS7自带的gcc版本是4.8.5,编译内核会出错
sudo yum install centos-release-scl -y && sudo yum install devtoolset-8-gcc* -y && scl enable devtoolset-8 bash
永久替换旧的gcc( 可选操作 )
mv /usr/bin/gcc /usr/bin/gcc-4.8.5 && ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc && mv /usr/bin/g++ /usr/bin/g++-4.8.5 && ln -s /opt/rh/devtoolset-8/root/bin/g++ /usr/bin/g++
下载最新的Linux Kernel6.0 rc3
从kernel.org下载6.0 rc3 的压缩包有203MB,由于国内网络的特殊情况下载会非常的慢,请自备加速手段或者耐心。
wget https://git.kernel.org/torvalds/t/linux-6.0-rc3.tar.gz tar zxvf linux-6.0-rc3.tar.gz cd linux-6.0-rc3
配置config
以下配置config文件的操作二选一,如果拿不准就选择第一个,有图形配置界面的。编辑config文件可以选定编译过中需要的内核模块或者组件。不懂不知道就全程默认。
通过menuconfig
make menuconfig
在linux-6.0-rc3
目录下敲这个命令,会进去一个配置界面,如果看不懂就保持默认配置,就按右方向键选定 save 然后回车,根据提示保存.config文件,
cat .config //查看有没有正确保存
根据现有内核拷贝生成config
也可通过现有内核参数去生成新的配置参数文件.config 。要注意 /boot/config-3.10.0-957.el7.x86_64
,就是/boot/目录下面这个相似的目录。或许不同CentOS7的路径名不同。要根据实际机器的目录改动。
cp /boot/config-3.10.0-957.el7.x86_64 ./.config make oldconfig //操作这里要一路回车 cat .config
执行编译
我要再提醒你一次,金箍戴上以后,你再也不是一个凡人,执行以下命令,你将是一个编译Linux内核的人。-j12参数是因为我给虚拟机分配了12核,让这12核别闲着。根据自己机器的情况改成 -j6、 -j8甚至 -j100都行。自行测试胡改的后果。编译过程费时费力,看编译机器的性能。假如是1C1G的云服务器执行编译,可以先去睡一觉。
make -j12 all
上面命令跑完后,内核模块如果没有特殊需求,可以把内核模块的debug信息给去掉,节约点硬盘空间。
make INSTALL_MOD_STRIP=1 modules_install > /dev/null && make modules_install && make install
设置默认新的kernel启动
sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg && sudo grub2-set-default 0 && sudo grub2-mkconfig -o /boot/grub2/grub.cfg
编译成rpm包
编译出单独的通用RPM包可以在其他的CentOS 7机器上直接安装,免去了以上繁琐的手动编译的过程。
在当前目录linux-6.0-rc3
下执行 :
yum -y install rpm-build && make rpm-pkg -j32
如果需要压缩体积,可以将make rpm-pkg -j32 换成 make INSTALL_MOD_STRIP=1 rpm-pkg 。
这条命令又会执行一会。执行完不出意外,会在系统的~/rpmbuild/RPMS/x86_64/
目录下出现三个rpm安装包。
-rw-r--r--. 1 root root 69354600 8月 31 19:46 kernel-6.0.0_rc3-1.x86_64.rpm -rw-r--r--. 1 root root 179586568 8月 31 19:48 kernel-devel-6.0.0_rc3-1.x86_64.rpm -rw-r--r--. 1 root root 1545516 8月 31 19:47 kernel-headers-6.0.0_rc3-1.x86_64.rpm
在其他机器CentOS7上安装(yum localinstall kern* -y
)这三个rpm包就行可以更新内核了。三个包装完还要更新一下启动项。
sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg && sudo grub2-set-default 0 && sudo grub2-mkconfig -o /boot/grub2/grub.cfg
这是我打包好的三个rpm包,有兴趣的朋友可以下载安装试试。不做任何可靠保证,请避免在生产环境上直接使用。
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