Hello 姜伯洋,

Logging of "unreachables" is not possible as far as I know. Although it would 
be a handy feature.
You could try "rec_control trace-regex '.*'". But this produces a huge amount 
of log and possibly decreases the Recursor performance.

Winfried

Am 31. Juli 2019 08:41:00 MESZ schrieb "姜伯洋" <15555513...@163.com>:
>[root@ops-dns-recursor-1 ~]# rec_control get unreachables
>342
>
>As you can see, the number of times my recursor has not reached the
>authoritative server is increasing every day. How can I troubleshoot
>this? When the counter is incremented, will the relevant log be
>recorded?
>
>
>
>
>At 2019-07-31 14:24:47, ab...@t-ipnet.net wrote:
>Hello 姜伯洋,
>
>If the Recursor does not reach an authoritative nameserver when
>resolving a domain, this counter is incremented by 1. The cause is
>usually not the Recursor.
>
>See https://doc.powerdns.com/recursor/metrics.html
>
>Winfried
>
>
>Am 31. Juli 2019 05:51:36 MESZ schrieb "姜伯洋" <15555513...@163.com>:
>[root@ops-dns-recursor-1 ~]# rec_control get unreachables
>333
>
>
>Hello everyone
>
>
>I want to know what will lead to an increase in this indicator. What
>effect will it have? How can I optimize recursor?
>
>
>
>
>
> 
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