在转发给Powerdns权威时，PowerDNS递归返回意外的SERVFAIL

Question

我在不同的服务器上有Powerdns递归(4.4.2来自ubuntu )和PowerDNS权威(4.4.1来自ubuntu )。

Recursor配置：

allow-from-file=/etc/pwrdnsallowfrom.acl
any-to-tcp=yes
forward-zones-file=/etc/pwrdnsforwaders.conf
log-common-errors=yes
log-timestamp=yes
new-domain-log=yes
unique-response-log=yes
loglevel=3
logging-facility=0
disable-syslog=no
max-negative-ttl=1

/etc/pwrdnsforwaders.conf内容：

cat /etc/pwrdnsforwaders.conf
.=192.168.60.10

权威配置：

gmysql-host=localhost
gmysql-port=3306
gmysql-user=powerdns
gmysql-password=password
gmysql-dbname=powerdns
gmysql-dnssec
local-address=192.168.60.10
api=yes
api-key=apikey
allow-axfr-ips=127.0.0.1
allow-dnsupdate-from=127.0.0.1
allow-notify-from=127.0.0.1
disable-axfr=yes
any-to-tcp=yes
cache-ttl=60
master=yes
max-tcp-connections=20
non-local-bind=no

有时，递归将返回一个SERVFAIL，以响应一次又一次的查询请求。只有重新启动才有帮助：

systemctl restart pdns-recursor.service

当出现问题时，递归日志中没有什么异常：

Mar 18 09:09:54 pwrdnsrec pdns_recursor [5524]: 2 [1888/1] question for 'example.com | A' from 11.22.33.44:39530
Mar 18 09:09:54 pwrdnsrec pdns_recursor [5524]: 2 [1888/1] answer to non-rd question 'example.com | A': 1 answers, 0 additional, took 0 packets, 0 netw ms, 0 tot ms , 0 throttled, 0 timeouts, 0 tcp connections, rcode = 0

有什么问题吗？

Answer 1

这些都是递归者和权威之间的网络问题。通过添加递归配置来解决这个问题：

  network timeout: 5000