环境：
CentOS Linux release 7.3.1611 (Core)
3.10.0-514.el7.x86_64
安装：
# yum install epel-release
# yum install varnish
# yum info varnish
Installed Packages
Name : varnish
Arch : x86_64
Version : 4.0.5
Release : 1.el7
Size : 1.2 M
Repo : installed
From repo : epel
Summary : High-performance HTTP accelerator
URL : http://www.varnish-cache.org/
License : BSD
Description : This is Varnish Cache, a high-performance HTTP accelerator.
: Documentation wiki and additional information about Varnish is
: available on the following web site: http://www.varnish-cache.org/
# rpm -ql varnish
/etc/logrotate.d/varnish
/etc/varnish
/etc/varnish/default.vcl
/etc/varnish/varnish.params
/run/varnish.pid
/usr/bin/varnishadm
/usr/bin/varnishhist
/usr/bin/varnishlog
/usr/bin/varnishncsa
/usr/bin/varnishstat
/usr/bin/varnishtest
/usr/bin/varnishtop
/usr/lib/systemd/system/varnish.service
/usr/lib/systemd/system/varnishlog.service
/usr/lib/systemd/system/varnishncsa.service
/usr/sbin/varnish_reload_vcl
/usr/sbin/varnishd
/usr/share/doc/varnish-4.0.5
/usr/share/doc/varnish-4.0.5/LICENSE
/usr/share/doc/varnish-4.0.5/README
/usr/share/doc/varnish-4.0.5/builtin.vcl
/usr/share/doc/varnish-4.0.5/changes.rst
/usr/share/doc/varnish-4.0.5/example.vcl
/usr/share/man/man1/varnishadm.1.gz
/usr/share/man/man1/varnishd.1.gz
/usr/share/man/man1/varnishhist.1.gz
/usr/share/man/man1/varnishlog.1.gz
/usr/share/man/man1/varnishncsa.1.gz
/usr/share/man/man1/varnishstat.1.gz
/usr/share/man/man1/varnishtest.1.gz
/usr/share/man/man1/varnishtop.1.gz
/usr/share/man/man3/vmod_directors.3.gz
/usr/share/man/man3/vmod_std.3.gz
/usr/share/man/man7/varnish-cli.7.gz
/usr/share/man/man7/varnish-counters.7.gz
/usr/share/man/man7/vcl.7.gz
/usr/share/man/man7/vsl-query.7.gz
/usr/share/man/man7/vsl.7.gz
/var/lib/varnish
/var/log/varnish
安装文件说明：
1. 服务配置文件： /etc/varnish/default.vcl, /etc/varnish/varnish.params
2. 程序文件：/usr/sbin/varnishd, /usr/bin/varnishadm, ......
3. 服务脚本：/usr/lib/systemd/system/varnish.service
# systemctl start varnish.service
说明：varnish默认配置，会监听在6081,6082端口。
