Hi,

 

Having a good time today…! Got another oddity since the upgrade of the Observium server itself to 16.04 unfortunately :(

 

In summary, all servers running BIND (they are still on 14.04) have now got zero ‘cache content’ stats since the Observium server was upgraded on Tuesday.

 

However, all the other BIND stats are working OK:

 

 

Looking at the debug output, it is getting the data fine, and it’s writing out the values to RRDCacheD OK.

 

I tried disabling RRDCacheD – it started working straight away. So, it looks like RRDCacheD (version 1.5.5 under 16.04) is unhappy with writing the ‘Cache’ elements content output for BIND.

 

If I had to guess, I’d say it’s either:

 

1)      something to do with the quantity of DS elements within that RRD (all 42 of them)

2)      something relating to the use of an “!” in the name of the elements (that’s a proper random guess)

 

The write attempt is:

 

mupdate /opt/observium/rrd/x.y.net/app-bind-23-cache-default.rrd N:6:3:::392500:799:13060:27296:825744:29:17815:555:67263:160:8::9660:2238:49:382:23:14:::::::259181:22:2::45094::26347::::::6715:::::::

 

My old RRDCacheD config was:

 

DISABLE=0

OPTS="-w 1800 -z 1800 -f 3600 -s www-data -l unix:/var/run/rrdcached.sock -j /var/lib/rrdcached/journal/ -F -b /opt/observium/rrd -B"

MAXWAIT=30

ENABLE_COREFILES=0

 

The new config has different parameters, so I’ve setup as follows:

 

DAEMON=/usr/bin/rrdcached

WRITE_TIMEOUT=1800

WRITE_JITTER=1800

BASE_PATH=/opt/observium/rrd/

JOURNAL_PATH=/var/lib/rrdcached/journal/

PIDFILE=/var/run/rrdcached.pid

SOCKFILE=/var/run/rrdcached.sock

SOCKGROUP=www-data

BASE_OPTIONS="-F -B"

 

Does anyone know of anything which could cause this? Or a magic value in RRDCacheD like “maximum number of DS elements”…?

 

Cheers,