varnish安装需要一系列依赖，且对依赖包版本有所要求，建议在全新安装下的CentOS下执行安装
按照顺序，依次执行按照命令
# libmpc 前置 mpfr
rpm -ivh mpfr-3.1.1-4.el7.x86_64.rpm
# cpp 前置 libmpc
rpm -ivh libmpc-1.0.1-3.el7.x86_64.rpm
# gcc 前置 cpp
rpm -ivh cpp-4.8.5-44.el7.x86_64.rpm
# glibc-headers 前置 kernel-headers
rpm -ivh kernel-headers-3.10.0-1160.el7.x86_64.rpm
# glibc-devel 前置 glibc-headers
rpm -ivh glibc-headers-2.17-317.el7.x86_64.rpm
# gcc 前置 glibc-devel
rpm -ivh glibc-devel-2.17-317.el7.x86_64.rpm
# varnish 前置 gcc
rpm -ivh gcc-4.8.5-44.el7.x86_64.rpm
# varnish 前置 libjemalloc.so.1
rpm -ivh jemalloc-3.3.1-1.8.amzn1.x86_64.rpm
# varnish
rpm -ivh varnish-6.2.2-1.el7.x86_64.rpm
除varnish外，所有rpm文件均可在 https://pkgs.org/ 下载获得