29  yum update -y   30  yum upgrade -y   31  yum install gcc gcc-c++ xz bc ncurses-devel   32  yum install hmaccalc zlib-devel binutils-devel elfutils-libelf-devel   33  cd /usr/local/   34  ll   35  cd src   36  ll   37  wget https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.12.17.tar.xz   38   ll   39  tar zxvf linux-3.12.17.tar.xz    40  tar -xf linux-3.12.17.tar.xz    41  ll   42  sudo yum groupinstall "Development Tools" # 一口气安装编译时所需的一切工具   43  sudo yum install hmaccalc zlib-devel binutils-devel elfutils-libelf-devel #创建 CentOS-6 内核时需要它们   44  uname -r   45  ll   46  cd linux-3.12.17   47  ll   48  cp /boot/config-2.6.32-431.el6.x86_64 .config   49  sh -c ‘yes "" | make oldconfig‘   50  sudo make -j18 bzImage   51  sudo make -j18 modules   52  sudo make -j8 modules_install   53  sudo make install   54  vim /etc/grub.conf    55  sudo reboot