varnish purge list ban

確認

sudo varnishadm ban.list

sudo varnishadm 
> ban.list

ban list は消せない。

No. You cannot clear the ban list. Bans are eliminated from the ban list in only two situations:

If they are older then the oldest object stored.
They get eaten by the ban lurker.
I'm not really sure about the other question.

https://www.varnish-cache.org/forum/topic/40