Varnishのログはファイルではなく共有メモリに出力されます。
なので、ログを確認するには"varnishlog"という専用のコマンドを利用します
4.x フィルタリング
$ varnishlog -g request -q "ReqUrl eq '/'" -i Timestamp,Begin,ReqMethod,ReqUrl,ReqHeader -d
varnishncsa -g request -q "ReqHeader ~ '^Host: .*\.example.com'"
Varnish 4.x
The varnishlog syntax and inner workings changed significantly in Varnish 4, and all examples from Varnishlog 3.x are no longer valid.
Here's how you can filter based on a single connecting IP.
# varnishlog -q "ReqStart ~ '10.0.1.5'"Varnish: filter by Source IP using Varnishlog (in Varnish 2.x, 3.x and 4.x)
