这条命令可以清除所有www.itingtao.com的缓存内容
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.http.host == www.itingtao.com"
只清除www.itingtao.com的首页：
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.http.host == www.itingtao.com && req.url == /"
清除www.itingtao.com/archives/目录下所有内容：
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.http.host == www.itingtao.com && req.url ~ /archives/*"
清除varnish服务器所有缓存：
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.url ~ /*"