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