Bandwidth, CPU & Memory stats returned in single line from terminal

Question

I'm trying to create a simple monitoring system that will show a graph of sales that is linked entirely to data of bandwidth, CPU and Memory stats as they relate to sales. So if I sale 1 widget per 5 seconds, that will be contingent upon my bandwidth etc being above a certain threshold. So I've formulated a way to do the graph but I'm just having a time getting the stats. I can use any of a number of monitoring systems but I just need 1 line for bandwidth, CPU Usage, and Memory Usage once per second. I made a python script that gets all the IP information from all interfaces. But for if I had a script I could run from terminal that simply output a single line I could just pipe that to a file and then access the file to run my real time graph.

So for network I can use:

$ ifconfig

I pipe it into a json file for easy reference.

I can use:

$ free -m

for memory which I suppose I can pipe into a file as well

Then I could use:

$ cat /proc/loadavg

for CPU and again pipe that.

Is there an easier way to do this? So that I receive a single line for each command and can easily (more importantly quickly) send that information via Javascript or HTML5 FileReader to the graphing solution?

Answer 1

I don't think there's an easy way to aggregate the data that you want, but you could stick a bunch of commands together then pipe it out to whatever. I spent a little bit of time to come up with an example.

{
  printf '%s' '{"load":["'$(cut -d' ' --output-delimiter='","' -f-3 /proc/loadavg)
  printf '%s' '"],"net":{'
  tail -n+3 /proc/net/dev|awk -F' ' '{
    gsub(/:/,"");
    printf "\"%s\":{\"rxbytes\":\"%s\",\"rxpackets\":\"%s\",\"rxerrs\":\"%s\",\"rxdrop\":\"%s\",\"txbytes\":\"%s\",\"txpackets\":\"%s\",\"txerrs\":\"%s\",\"txdrop\":\"%s\"},",$1,$2,$3,$4,$5,$10,$11,$12,$13
  }'|sed 's/,$//'
  printf '%s' '},"mem":{'
  grep -E '^(MemTotal|MemFree|SwapTotal|SwapFree):' /proc/meminfo|tr 'A-Z' 'a-z'|awk -F' ' '{gsub(/:/,""); printf "\"%s\":\"%s\",",$1,$2}'|sed 's/,$//'
  printf '%s' '}}'
}

You could squish it down into this:

{ printf '%s' '{"load":["'$(cut -d' ' --output-delimiter='","' -f-3 /proc/loadavg); printf '%s' '"],"net":{'; tail -n+3 /proc/net/dev|awk -F' ' '{ gsub(/:/,""); printf "\"%s\":{\"rxbytes\":\"%s\",\"rxpackets\":\"%s\",\"rxerrs\":\"%s\",\"rxdrop\":\"%s\",\"txbytes\":\"%s\",\"txpackets\":\"%s\",\"txerrs\":\"%s\",\"txdrop\":\"%s\"},",$1,$2,$3,$4,$5,$10,$11,$12,$13 }'|sed 's/,$//'; printf '%s' '},"mem":{'; grep -E '^(MemTotal|MemFree|SwapTotal|SwapFree):' /proc/meminfo|tr 'A-Z' 'a-z'|awk -F' ' '{gsub(/:/,""); printf "\"%s\":\"%s\",",$1,$2}'|sed 's/,$//'; printf '%s' '}}'; }

That should output some (valid) JSON that looks like this:

{"load":["0.00","0.01","0.05"],"net":{"lo":{"rxbytes":"2524231953","rxpackets":"1381864","rxerrs":"0","rxdrop":"0","txbytes":"2524231953","txpackets":"1381864","txerrs":"0","txdrop":"0"},"eth0":{"rxbytes":"2093914043","rxpackets":"2859952","rxerrs":"0","rxdrop":"0","txbytes":"1774385937","txpackets":"1485252","txerrs":"0","txdrop":"0"}},"mem":{"memtotal":"1692584","memfree":"20248","swaptotal":"917500","swapfree":"916288"}}

You could then add | whatever after the close curly to pipe it to whatever.

Answer 2

You might want to look into i3status. It's not really designed for this purpose, but it sounds like it would fulfil your requirements quite nicely.