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Monitoring Network Microbursts

/ Published in: Bash
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Bytes per second isn't granular enough to get a real idea of how your network is really being used.

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  1. #!/bin/bash
  2.  
  3. function nets {
  4.     TX_TOTAL=0
  5.     RX_TOTAL=0
  6.     TX_GAUGE="B"   # Bytes
  7.     RX_GAUGE="B"   # Bytes
  8.     INTERFACE="venet0"
  9.     for ((i=0;i<10;i++)); do    
  10.         RX_BYTES=$(cat /sys/class/net/${INTERFACE}/statistics/rx_bytes)
  11.         TX_BYTES=$(cat /sys/class/net/${INTERFACE}/statistics/tx_bytes)
  12.         LAST_RX_BYTES=${RX_BYTES}
  13.         LAST_TX_BYTES=${TX_BYTES}
  14.         sleep .10
  15.         RX_BYTES=$(cat /sys/class/net/${INTERFACE}/statistics/rx_bytes)
  16.         TX_BYTES=$(cat /sys/class/net/${INTERFACE}/statistics/tx_bytes)
  17.         TX_DIFF=$[ ${TX_BYTES} - ${LAST_TX_BYTES} ]
  18.         RX_DIFF=$[ ${RX_BYTES} - ${LAST_RX_BYTES} ]
  19.         TX_TOTAL=$[ ${TX_TOTAL} + ${TX_DIFF} ]
  20.         RX_TOTAL=$[ ${RX_TOTAL} + ${RX_DIFF} ]
  21.         if [ ${RX_DIFF} -gt 1024 ]; then
  22.             RX_GAUGE="KB"
  23.             RX_DIFF=$[ ${RX_DIFF} / 1024 ]
  24.             if [ ${RX_DIFF} -gt 1024 ]; then
  25.                 RX_GAUGE="MB"
  26.                 RX_DIFF=$[ ${RX_DIFF} / 1024 ]
  27.             fi
  28.         fi
  29.         if [ ${TX_DIFF} -gt 1024 ]; then
  30.             TX_GAUGE="KB"
  31.             TX_DIFF=$[ ${TX_DIFF} / 1024 ]
  32.             if [ ${TX_DIFF} -gt 1024 ]; then
  33.                 TX_GAUGE="MB"
  34.                 TX_DIFF=$[ ${TX_DIFF} / 1024 ]
  35.             fi
  36.         fi    
  37.         if [[ ${TX_DIFF} -gt 0 || ${RX_DIFF} -gt 0 ]]; then
  38.             printf "${i}00ms  - TX: ${TX_DIFF}${TX_GAUGE}\tRX: ${RX_DIFF}${TX_GAUGE}\n"
  39.         fi
  40.     done
  41.     if [ ${RX_TOTAL} -gt 1024 ]; then
  42.         RX_GAUGE="KB"
  43.         RX_TOTAL=$[ ${RX_TOTAL} / 1024 ]
  44.         if [ ${RX_TOTAL} -gt 1024 ]; then
  45.             RX_GAUGE="MB"
  46.             RX_TOTAL=$[ ${RX_TOTAL} / 1024 ]
  47.         fi
  48.     fi
  49.     if [ ${TX_TOTAL} -gt 1024 ]; then
  50.         TX_GAUGE="KB"
  51.         TX_TOTAL=$[ ${TX_TOTAL} / 1024 ]
  52.         if [ ${TX_TOTAL} -gt 1024 ]; then
  53.             TX_GAUGE="MB"
  54.             TX_TOTAL=$[ ${TX_TOTAL} / 1024 ]
  55.         fi
  56.     fi 
  57.     printf "1000ms - TX: ${TX_TOTAL}${TX_GAUGE}\tRX: ${RX_TOTAL}${RX_GAUGE}\n"
  58. }
  59.  
  60. while :; do nets && date "+%S"; done

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