Date: Fri, 24 Aug 2018 16:28:19 +0300 From: Stefan Lambrev <cheffo@freebsd-bg.org> To: freebsd-stable@freebsd.org Subject: Strange unbound behaviour Message-ID: <CAHtsMQ1JDWoe3O4PaU9VF%2Bw0-1Pz6eq3NmnT3UPj6QHebciLWA@mail.gmail.com>
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Hi,
I have two DNS servers up and running for my home setup. But for some
reason both stop resolving at some point.
1st instance is with unbbound from ports, second from base system but
configs are very similar:
# cat /usr/local/etc/unbound/unbound.conf
# This file was generated by local-unbound-setup.
# Modifications will be overwritten.
server:
interface: 0.0.0.0
port: 53
do-ip4: yes
do-ip6: no
do-udp: yes
do-tcp: yes
use-caps-for-id: yes
username: unbound
directory: /usr/local/etc/unbound
chroot: /usr/local/etc/unbound
pidfile: /var/run/local_unbound.pid
auto-trust-anchor-file: /usr/local/etc/unbound/root.key
use-syslog: yes
logfile: "log/unbound.log"
statistics-interval: 600
verbosity: 1
access-control: 127.0.0.0/8 allow
access-control: 10.1.1.0/24 allow
hide-identity: yes
hide-version: yes
num-threads: 6
include: /usr/local/etc/unbound/forward.conf
include: /usr/local/etc/unbound/lan-zones.conf
include: /usr/local/etc/unbound/control.conf
include: /usr/local/etc/unbound/conf.d/*.conf
If I restart the service it works again...
root@umbrella:~# host dir.bg 127.0.0.1
;; connection timed out; no servers could be reached
umbrella:~# /etc/rc.d/local_unbound restart
Stopping local_unbound.
Waiting for PIDS: 645.
Starting local_unbound.
[1535116695] unbound[81742:0] warning: too many file descriptors requested.
The builtinmini-event cannot handle more than 1024. Config for less fds or
compile with libevent
[1535116695] unbound[81742:0] warning: continuing with less udp ports: 139
Waiting for nameserver to start... good
[16:18]root@umbrella:~# host dir.bg 127.0.0.1
Using domain server:
Name: 127.0.0.1
Address: 127.0.0.1#53
Aliases:
dir.bg has address 194.145.63.12
dir.bg mail is handled by 1 mail.dir.bg.
Exactly the same behaviour on the other server.
The servers do not have many clients - it's a home network.
If've tried to debug this, but I do not see any errors in the logs, no sign
of low buffers or whatever.
The thing is that it looks like very easy to reproduce in my environment -
just launch the service use it for few days (sometimes hours) and it just
stops resolving new requests (cache is working, local zone are working and
etc)
Oh and If I reduce "num-threads" it's even easier to reproduce.
Anyone with similar experience?
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