1、首先查看Linux 的系统版本号
cat /etc/redhat-release
2、下载相应版本的镜像文件
下载地址：http://vault.centos.org/7.2.1511/isos/x86_64/
把7.2.1511改成你的相对版本号，我这里选择种子文件下载，速度还可以。
3、解压CentOS7操作系统安装镜像，进入到CentOS-7.2-1511-x86_64-DVD\Packages目录，这下面存储了很多rpm包。
4、找到下面列出的rpm包，上传到CentOS机器任意位置。
autogen-libopts-5.18-5.el7.x86_64.rpm
cpp-4.8.2-16.el7.x86_64.rpm
gcc-4.8.2-16.el7.x86_64.rpm
glibc-devel-2.17-55.el7.x86_64.rpm
glibc-headers-2.17-55.el7.x86_64.rpm
kernel-headers-3.10.0-123.el7.x86_64.rpm
keyutils-libs-devel-1.5.8-3.el7.x86_64.rpm
krb5-devel-1.11.3-49.el7.x86_64.rpm
libcom_err-devel-1.42.9-4.el7.x86_64.rpm
libmpc-1.0.1-3.el7.x86_64.rpm
libselinux-devel-2.2.2-6.el7.x86_64.rpm
libsepol-devel-2.1.9-3.el7.x86_64.rpm
libverto-devel-0.2.5-4.el7.x86_64.rpm
mpfr-3.1.1-4.el7.x86_64.rpm
ntp-4.2.6p5-18.el7.centos.x86_64.rpm
ntpdate-4.2.6p5-18.el7.centos.x86_64.rpm
openssl098e-0.9.8e-29.el7.centos.x86_64.rpm
openssl-1.0.1e-34.el7.x86_64.rpm
openssl-devel-1.0.1e-34.el7.x86_64.rpm
openssl-libs-1.0.1e-34.el7.x86_64.rpm
pcre-devel-8.32-12.el7.x86_64.rpm
pkgconfig-0.27.1-4.el7.x86_64.rpm
tcl-8.5.13-4.el7.x86_64.rpm
zlib-1.2.7-13.el7.x86_64.rpm
zlib-devel-1.2.7-13.el7.x86_64.rpm
5、执行如下命令，等待安装完成：
rpm -Uvh ./*.rpm --nodeps --force
原文链接：https://blog.****.net/czbqoo01/article/details/89242094