244 lines
9.9 KiB
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244 lines
9.9 KiB
HTML
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<h1 id="RRDtool%20looks%20nicer...">RRDtool looks nicer...</h1>
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<p class="f7">March 14, 2019</p>
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<p><a href="https://openbsd.amsterdam/">OpenBSD Amsterdam</a> was in search of a lightweight toolset to keep track of resource usage, at a minimum the CPU load generated by the <a href="https://man.openbsd.org/vmm.4">vmm(4)</a>/<a href="https://man.openbsd.org/vmd.8">vmd(8)</a> hosts and the traffic from and to the hosts. A couple of weeks ago we ended up with a workable <a href="https://openbsd.amsterdam/blog/using-mrtg-again.html">MRTG Setup</a>. While it worked, it didn't look very pretty.</p>
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<p>In a moment of clarity, we thought about using <a href="https://oss.oetiker.ch/rrdtool/">RRDtool</a>. Heck, why shouldn't we give it a try? From the previous tooling, we already had some required building blocks in place to make <a href="https://oss.oetiker.ch/mrtg/">MRTG</a> understand the CPU Cores and uptime from <a href="https://openbsd.org/">OpenBSD</a>.</p>
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<p>Before we start:</p>
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<pre>
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# <b>pkg_add rrdtool</b>
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#
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</pre>
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<p>We decided to split the collection of the different OIDs (SNMP Object Identifiers) into three different scripts, which <a href="https://man.openbsd.org/cron.1">cron(1)</a> calls, from a wrapper script.</p>
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<ul>
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<li>uptime.sh</li>
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<li>cpu_load.sh</li>
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<li>interface.sh</li>
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</ul>
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<h3 id="uptime.sh">uptime.sh</h3>
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<pre>
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#!/bin/sh
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test -n "$1" || exit 1
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HOST="$1"
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COMMUNITY="public"
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UPTIMEINFO="/tmp/${HOST}-uptime.txt"
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TICKS=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid hrSystemUptime.0 | cut -d= -f2)
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DAYS=$(echo "${TICKS}/8640000" | bc -l)
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HOURS=$(echo "0.${DAYS##*.} * 24" | bc -l)
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MINUTES=$(echo "0.${HOURS##*.} * 60" | bc -l)
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SECS=$(echo "0.${MINUTES##*.} * 60" | bc -l)
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test -n "$DAYS" && printf '%s days, ' "${DAYS%.*}" > ${UPTIMEINFO}
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printf '%02d\\:%02d\\:%02d\n' "${HOURS%.*}" "${MINUTES%.*}" "${SECS%.*}" >> ${UPTIMEINFO}
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</pre>
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<p>This is a seperate script, due to the uptime usage of both hosts in both graphs. </p>
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<p>The origins for this script can be found detailled in our <a href="https://openbsd.amsterdam/blog/using-mrtg-again.html">MRTG Setup</a>.</p>
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<h3 id="cpu_load.sh">cpu_load.sh</h3>
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<pre>
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test -n "$1" || exit 1
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HOST="$1"
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COMMUNITY="public"
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RRDFILES="/var/rrdtool"
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IMAGES="/var/www/htdocs"
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WATERMARK="OpenBSD Amsterdam - https://obsda.ms"
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RRDTOOL="/usr/local/bin/rrdtool"
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CPUINFO="/tmp/${HOST}-cpu.txt"
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UPTIME=$(cat /tmp/${HOST}-uptime.txt)
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NOW=$(date "+%Y-%m-%d %H:%M:%S %Z" | sed 's/:/\\:/g')
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if ! test -f "${RRDFILES}/${HOST}-cpu.rrd"
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then
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echo "Creating ${RRDFILES}/${HOST}-cpu.rrd"
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${RRDTOOL} create ${RRDFILES}/${HOST}-cpu.rrd \
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--step 300 \
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DS:ds0:GAUGE:600:U:U \
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RRA:MAX:0.5:1:20000
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fi
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snmpctl snmp walk ${HOST} community ${COMMUNITY} oid hrProcessorLoad | cut -d= -f2 > ${CPUINFO}
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CORES=$(grep -cv "^0$" ${CPUINFO})
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CPU_LOAD_SUM=$(awk '{sum += $1} END {print sum}' ${CPUINFO})
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CPU_LOAD=$(echo "scale=2; ${CPU_LOAD_SUM}/${CORES}" | bc -l)
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${RRDTOOL} update ${RRDFILES}/${HOST}-cpu.rrd N:${CPU_LOAD}
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${RRDTOOL} graph ${IMAGES}/${HOST}-cpu.png \
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--start -43200 \
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--title "${HOST} - CPU" \
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--vertical-label "% CPU Used" \
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--watermark "${WATERMARK}" \
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DEF:CPU=${RRDFILES}/${HOST}-cpu.rrd:ds0:AVERAGE \
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AREA:CPU#FFCC00 \
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LINE2:CPU#CC0033:"CPU" \
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GPRINT:CPU:MAX:"Max\:%2.2lf %s" \
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GPRINT:CPU:AVERAGE:"Average\:%2.2lf %s" \
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GPRINT:CPU:LAST:" Current\:%2.2lf %s\n" \
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COMMENT:"\\n" \
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COMMENT:" SUM CPU Load / Active Cores = % CPU Used\n" \
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COMMENT:" Up for ${UPTIME} at ${NOW}"
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</pre>
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<p>On the first run, <a href="https://oss.oetiker.ch/rrdtool/">RRDtool</a> will create the .rrd file. On every subsequent run, it will update the file with the collected values and update the graph.</p>
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<p>The origins for this script can be found detailled in our <a href="https://openbsd.amsterdam/blog/using-mrtg-again.html">MRTG Setup</a>.</p>
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<h3 id="interface.sh">interface.sh</h3>
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<pre>
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test -n "$1" || exit 1
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test -n "$2" || exit 1
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HOST="$1"
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INTERFACE="$2"
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COMMUNITY="public"
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RRDFILES="/var/rrdtool"
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IMAGES="/var/www/htdocs"
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WATERMARK="OpenBSD Amsterdam - https://obsda.ms"
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RRDTOOL="/usr/local/bin/rrdtool"
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UPTIME=$(cat /tmp/${HOST}-uptime.txt)
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NOW=$(date "+%Y-%m-%d %H:%M:%S %Z" | sed 's/:/\\:/g')
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if ! test -f "${RRDFILES}/${HOST}-${INTERFACE}.rrd"
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then
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echo "Creating ${RRDFILES}/${HOST}-${INTERFACE}.rrd"
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${RRDTOOL} create ${RRDFILES}/${HOST}-${INTERFACE}.rrd \
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--step 300 \
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DS:ds0:COUNTER:600:0:1250000000 \
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DS:ds1:COUNTER:600:0:1250000000 \
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RRA:AVERAGE:0.5:1:600 \
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RRA:AVERAGE:0.5:6:700 \
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RRA:AVERAGE:0.5:24:775 \
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RRA:AVERAGE:0.5:288:797 \
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RRA:MAX:0.5:1:600 \
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RRA:MAX:0.5:6:700 \
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RRA:MAX:0.5:24:775 \
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RRA:MAX:0.5:288:797
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fi
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IN=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifInOctets.${INTERFACE} | cut -d= -f2)
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OUT=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifOutOctets.${INTERFACE} | cut -d= -f2)
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DESCR=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifDescr.${INTERFACE} | cut -d= -f2 | tr
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-d '"')
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${RRDTOOL} update ${RRDFILES}/${HOST}-${INTERFACE}.rrd N:${IN}:${OUT}
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${RRDTOOL} graph ${IMAGES}/${HOST}-${INTERFACE}.png \
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--start -43200 \
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--title "${HOST} - ${DESCR}" \
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--vertical-label "Bits per Second" \
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--watermark "${WATERMARK}" \
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DEF:IN=${RRDFILES}/${HOST}-${INTERFACE}.rrd:ds0:AVERAGE \
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DEF:OUT=${RRDFILES}/${HOST}-${INTERFACE}.rrd:ds1:AVERAGE \
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CDEF:IN_CDEF="IN,8,*" \
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CDEF:OUT_CDEF="OUT,8,*" \
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AREA:IN_CDEF#00FF00:"In " \
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GPRINT:IN_CDEF:MAX:"Max\:%5.2lf %s" \
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GPRINT:IN_CDEF:AVERAGE:"Average\:%5.2lf %s" \
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GPRINT:IN_CDEF:LAST:" Current\:%5.2lf %s\n" \
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LINE2:OUT_CDEF#0000FF:"Out" \
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GPRINT:OUT_CDEF:MAX:"Max\:%5.2lf %s" \
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GPRINT:OUT_CDEF:AVERAGE:"Average\:%5.2lf %s" \
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GPRINT:OUT_CDEF:LAST:" Current\:%5.2lf %s\n" \
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COMMENT:"\\n" \
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COMMENT:" Up for ${UPTIME} at ${NOW}"
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</pre>
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<p>To pinpoint the network interface you want to measure the bandwith for, this command prints the available interfaces:</p>
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<pre>
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snmpctl snmp walk [host] community [community] oid ifDescr
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</pre>
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<p>This will output a list like:</p>
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<pre>
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ifDescr.1="em0"
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ifDescr.2="em1"
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ifDescr.3="enc0"
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ifDescr.4="lo0"
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ifDescr.5="bridge880"
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ifDescr.6="vlan880"
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ifDescr.13="pflog0"
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ifDescr.669="tap0"
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ifDescr.670="tap1"
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</pre>
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<p>The number behind <code>ifDescr</code> is the one that you need to feed to <strong>interface.sh</strong>, for example:</p>
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<pre>
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# interface.sh 5
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</pre>
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<p>Finally the <strong>wrapper.sh</strong> script calls all the aforementioned scripts:</p>
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<pre>
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#!/bin/sh
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SCRIPTS="/var/rrdtool"
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for i in $(jot 2 1); do ${SCRIPTS}/uptime.sh host${i}.domain.tld; done
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for i in $(jot 2 1); do ${SCRIPTS}/cpu_load.sh host${i}.domain.tld; done
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${SCRIPTS}/interface.sh host1.domain.tld 12
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${SCRIPTS}/interface.sh host2.domain.tld 11
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</pre>
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<p>The resulting graphs:</p>
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<p><img src="https://ops.high5.nl/obsda.ms/s1.obsda.ms-cpu.png" alt="" />
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<img src="https://ops.high5.nl/obsda.ms/s1.obsda.ms-12.png" alt="" /></p>
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<p>To serve the graphs we use <a href="http://man.openbsd.org/httpd.8">httpd(8)</a> with the following config:
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<pre>
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server "default" {
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listen on * port 80
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location "/.well-known/acme-challenge/*" {
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root "/acme"
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request strip 2
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}
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location * {
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block return 302 "https://$HTTP<em>HOST$REQUEST</em>URI"
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}
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}</p>
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<p>server "default" {
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listen on * tls port 443
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tls {
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certificate "/etc/ssl/default-fullchain.pem"
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key "/etc/ssl/private/default.key"
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}
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location "/.well-known/acme-challenge/*" {
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root "/acme"
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request strip 2
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}
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root "/htdocs"
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}
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</pre>
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All the scripts can be found in our <a href="https://git.high5.nl/rrdtool">Git Repository</a>.</p>
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<p>You can follow us on <a href="https://twitter.com/@OpenBSDAms">Twitter</a> and <a href="https://bsd.network/@OpenBSDAms">Mastodon</a>.</p>
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<p class="footer f7 mt4">
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© 2018–2020 OpenBSD Amsterdam is a project of <a href="https://high5.nl/">High5!</a>
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