Unable to start Unbound after switch away from KEA

michmoor

Manually starting the service

 unbound -c /var/unbound/unbound.conf
/var/unbound/unbound.conf:17: error: number expected
/var/unbound/unbound.conf:17: error: unknown keyword 'yes'
/var/unbound/unbound.conf:33: error: number expected
read /var/unbound/unbound.conf failed: 3 errors in configuration file
[1733101412] unbound[3798:0] fatal error: Could not read config file: /var/unbound/unbound.conf. Maybe try unbound -dd, it stays on the commandline to see more errors, or unbound-checkconf

Here is the unbound.conf again.

 cat /var/unbound/unbound.conf
##########################
# Unbound Configuration
##########################

##
# Server configuration
##
server:

chroot: /var/unbound
username: "unbound"
directory: "/var/unbound"
pidfile: "/var/run/unbound.pid"
use-syslog: yes
port: 53
verbosity:
hide-identity: yes
hide-version: yes
harden-glue: yes
do-ip4: yes
do-ip6: yes
do-udp: yes
do-tcp: yes
do-daemonize: yes
module-config: "validator iterator"
unwanted-reply-threshold: 0
num-queries-per-thread: 4096
jostle-timeout: 200
infra-keep-probing: yes
infra-host-ttl: 900
infra-cache-numhosts: 10000
outgoing-num-tcp:
incoming-num-tcp:
edns-buffer-size: 1332
cache-max-ttl: 86400
cache-min-ttl: 0
harden-dnssec-stripped: yes
msg-cache-size: 4m
rrset-cache-size: 8m

num-threads: 2
msg-cache-slabs: 2
rrset-cache-slabs: 2
infra-cache-slabs: 2
key-cache-slabs: 2
outgoing-range: 4096
so-rcvbuf: 12m
auto-trust-anchor-file: /var/unbound/root.key
prefetch: no
prefetch-key: no
use-caps-for-id: no
serve-expired: no
sock-queue-timeout: 0
aggressive-nsec: no
# Statistics
# Unbound Statistics
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: yes

# TLS Configuration
tls-cert-bundle: "/etc/ssl/cert.pem"

# Interface IP addresses to bind to
interface-automatic: yes


# DNS Rebinding




# Access lists
include: /var/unbound/access_lists.conf

# Static host entries
include: /var/unbound/host_entries.conf

# dhcp lease entries
include: /var/unbound/dhcpleases_entries.conf



# Domain overrides
include: /var/unbound/domainoverrides.conf
# Forwarding
forward-zone:
        name: "."
        forward-addr: 9.9.9.9
        forward-addr: 149.112.112.112




###
# Remote Control Config
###
include: /var/unbound/remotecontrol.conf

michmoor

Counting the lines in the conf file, Line 17 is the following

hide-version: yes

I went into the GUI, DNS Resolver , Advanced Settings, and unchecked Hide Version.
Apply changes.
DNS Resolver starts without issues and name resolution finally works.

@stephenw10 what is that setting and why did having it checked break Unbound? Seems like a redmine issue but i don't know what the fault is.
Checking my 6100 HighAvailability pair, they have it enabled and no Unbound issues post upgrade. Even did a failover to test and it works.

Any guidance you can offer i would greatly appreciate it!

Gertjan

@michmoor

This one :

runs because you've set :

If it is possible : disable that option.

dhcpdleases restarts unbound every time a new DHCP lease event is received.
This can give you the impression that 'unbound' wasn't running as it was 'restarting again (and again, and again etc etc).
Unbound restarts do take some time, several seconds, or more.

You see the command line option of that dhcpdleases process ?

-p /var/run/unbound.pid

which means that when you restart manually unbound, the PID changes.
dhcpdleases also has to be restarted - not sure if you can do this manually.

michmoor

@Gertjan Thanks Gertjan but you are misunderstanding the problem.

DNS resolver wasn't running due to a parameter set it did not recognize or like for some reason. After negating that in the advanced options in Unbound, it started up successfully and resolved hostnames.

The issue here is why was it broken in the first place. The only connection i have to KEA is that it was the last change i made on the system before i reverted back.

stephenw10

Line 17 is actually hide-identity: yes. But that's not the issue that's a default setting. The problem is that you had no log verbosity value on the line before. It's expecting a number for the log verbosity and sees not-a-number at the start of line 17.

Resaving the Unbound Advanced page will have added that value back.

The same applies to the values for:

outgoing-num-tcp: 
incoming-num-tcp:

However I have no idea what might have caused those to not be populated. Unbound should never have allowed those empty values.

michmoor

@stephenw10 I gotcha.
As mentioned, the last change I made was the KEA switchover. I don't know if KEA is involved with Unbound in this case, but that was the last change I made. I don't understand what could suddenly cause Unbound to find a problem with the conf file. Outside of configuring Unbound via the GUI as far as i know there is no direct way to modify the configuration and have it saved. I could be wrong of course.

stephenw10

Indeed. I can see why it rejected that conf file because there are values missing. What I can't understand is how that was ever generated and passed the Unbound tests.

If you revert that change to the Unbound settings I imagine it will still start no problem.

michmoor

@stephenw10 I reverted my change in Unbound and here is the conf file now.

##########################
# Unbound Configuration
##########################

##
# Server configuration
##
server:

chroot: /var/unbound
username: "unbound"
directory: "/var/unbound"
pidfile: "/var/run/unbound.pid"
use-syslog: yes
port: 53
verbosity: 1
hide-identity: yes
hide-version: yes
harden-glue: yes
do-ip4: yes
do-ip6: yes
do-udp: yes
do-tcp: yes
do-daemonize: yes
module-config: "validator iterator"
unwanted-reply-threshold: 0
num-queries-per-thread: 512
jostle-timeout: 200
infra-keep-probing: yes
infra-host-ttl: 900
infra-cache-numhosts: 10000
outgoing-num-tcp: 10
incoming-num-tcp: 10
edns-buffer-size: 1332
cache-max-ttl: 86400
cache-min-ttl: 0
harden-dnssec-stripped: yes
msg-cache-size: 4m
rrset-cache-size: 8m

num-threads: 2
msg-cache-slabs: 2
rrset-cache-slabs: 2
infra-cache-slabs: 2
key-cache-slabs: 2
outgoing-range: 4096
so-rcvbuf: 12m
auto-trust-anchor-file: /var/unbound/root.key
prefetch: no
prefetch-key: no
use-caps-for-id: no
serve-expired: no
sock-queue-timeout: 0
aggressive-nsec: no
# Statistics
# Unbound Statistics
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: yes

# TLS Configuration
tls-cert-bundle: "/etc/ssl/cert.pem"

# Interface IP addresses to bind to
interface-automatic: yes


# DNS Rebinding




# Access lists
include: /var/unbound/access_lists.conf

# Static host entries
include: /var/unbound/host_entries.conf

# dhcp lease entries
include: /var/unbound/dhcpleases_entries.conf



# Domain overrides
include: /var/unbound/domainoverrides.conf
# Forwarding
forward-zone:
	name: "."
	forward-addr: 9.9.9.9
	forward-addr: 149.112.112.112




###
# Remote Control Config
###
include: /var/unbound/remotecontrol.conf

stephenw10

Yup so now those 3 values are all populated. And I imagine it starts fine?

michmoor

@stephenw10

Yep starts up fine, no issues.

Unless i can reproduce it or others have a similar issue might have to throw this in the mystery box.