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验证网络情况：
yum install
安装需要的软件：
yum install setools-console
yum install httpd
yum install policycoreutils-python setools-console
yum -y install vsftpd ftp
yum install m4
yum -y install gcc
安装内核编译的软件：
yum install rpm-build xmlto hmaccalc asciidoc newt-devel pesign binutils-devel audit-libs-devel numactl-devel pciutils-devel ncurses-devel perl-ExtUtils-Embed elfutils-devel python-devel ruby-devel libsepol-static swig xz-devel ruby checkpolicy policycoreutils-devel
下载内核源码：
wget http://vault.centos.org/centos/7/os/Source/SPackages/kernel-3.10.0-514.el7.src.rpm
安装内核源码：
rpm -i kernel-3.10.0-514.el7.src.rpm
编译源码:
cd /root/rpmbuild/SPECS/
rpmbuild -bb kernel.spec
注：安装编译源码报错处理：
yum install mock
useradd -s /sbin/nologin mockbuild
yum install bison
编译过程中内核的源码会被解压缩，并打好补丁，释放在
/root/rpmbuild/BUILD目录。
编译后的kernel会在/root/rpmbuild/RPMS中