On Wed, Jan 04, 2017 at 10:49:21AM +0100, Ralf Hildebrandt wrote:
> Given that I'm currently blind regarding usage numbers, I'd like to
> know how you're monitoring usage of your pool servers.
I'm using iptables+collectd+rrdtool. A like collectd because it can
collect data every second while not loading the CPU too much.
In iptables there are rules for NTP packets with comments:
iptables -A INPUT -p udp -m udp --dport 123 -m comment --comment ntp_ipv4_in -j
ACCEPT
iptables -A OUTPUT -p udp -m udp --sport 123 -m comment --comment ntp_ipv4_out
-j ACCEPT
ip6tables -A INPUT -p udp -m udp --dport 123 -m comment --comment ntp_ipv6_in
-j ACCEPT
ip6tables -A OUTPUT -p udp -m udp --sport 123 -m comment --comment ntp_ipv6_out
-j ACCEPT
In collectd.conf there is:
Interval 1
LoadPlugin iptables
LoadPlugin rrdtool
LoadPlugin chrony
<Plugin iptables>
Chain "filter" "INPUT" "ntp_ipv4_in"
Chain "filter" "OUTPUT" "ntp_ipv4_out"
Chain6 "filter" "INPUT" "ntp_ipv6_in"
Chain6 "filter" "OUTPUT" "ntp_ipv6_out"
</Plugin>
<Plugin rrdtool>
DataDir "/var/lib/collect/rrd"
CacheTimeout 60
RRARows 1200
RRATimespan 86400
RRATimespan 604800
RRATimespan 2678400
RRATimespan 31622400
</Plugin>
The graphs are generated by rrdtool in a script that's started
periodically from cron. The graphs I posted were created like this:
rrdtool graph traffic-ipv4-day.png -o -t 'server traffic IPv4' \
-w 900 -h 300 -s now-86400 -e now \
DEF:inmin=/var/lib/collectd/rrd/ntp2/iptables-filter-INPUT/ipt_packets-ntp_ipv4_in.rrd:value:MIN
\
DEF:inavg=/var/lib/collectd/rrd/ntp2/iptables-filter-INPUT/ipt_packets-ntp_ipv4_in.rrd:value:AVERAGE
\
DEF:inmax=/var/lib/collectd/rrd/ntp2/iptables-filter-INPUT/ipt_packets-ntp_ipv4_in.rrd:value:MAX
\
AREA:inmax#7070aa AREA:inmin#ffffff \
'LINE2:inavg#0000bb:Received ' \
'GPRINT:inmin:MIN:Min\:%7.1lf pkt/s' \
'GPRINT:inavg:AVERAGE:Avg\:%7.1lf pkt/s' \
'GPRINT:inmax:MAX:Max\:%7.1lf pkt/s\l'
I have other graphs showing dropped packets (substracting the "out"
numbers from "in") and various data collected by the chrony plugin.
--
Miroslav Lichvar
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