rrdtool create inside_temperature.rrd   \
        --step 3600                     \
        DS:temperature:GAUGE:7200:U:U   \
        RRA:AVERAGE:0.5:1:8064


rrdtool create outside_temperature.rrd  \
        --step 3600                     \
        DS:temperature:GAUGE:7200:U:U   \
        RRA:AVERAGE:0.5:1:8064