Linux Traffic Shaping Graphs

[innovot]

Would like to start capturing statistics from 'tc' so we can see how our QoS is performing. Thoughts on the best way to do this ? Am guessing that we would write a script on the node to run the commands via Zabbix Agent and pass that data back to the server as items ? Thank you.

[JeromeB]

TC traffic stats

Here's what I did to gather and graph stats from a bunch of htb classes that are defined in an IMQ interface on couple our our linux based (vyatta) routers.

First I made a script to run a LLD proccess for traffic classes, it takes an argument which is the device I'm trying to discover traffic stats from:

#! /usr/bin/perl
$first = 1;
$ind = 0;
print "{\n";
print "\t\"data\":[\n\n";

my @data = qx/\/sbin\/tc class show dev $ARGV[0]/;
foreach (@data)
        {
        ($index) = (@data[$ind] =~ /class\s\S+\s(\S+)\s.+/);
        ($type) = (@data[$ind] =~ /class\s(\S+)\s\S+\s.+/);
        print " ,\n" if not $first;
        $first = 0;
        print "\t{ ";
        print "  \"{#CLASSINDEX}\":\"$index\",";
        print "    \"{#CLASSTYPE}\":\"$type\"";
        print "\t}";
        $ind = $ind+1;
        }
print "\n\t]\n";
print "}\n";

Then a second script to populate the discovered class items, the arguments on this one are the device, the tc class index, and the item:

#! /usr/bin/perl
my @data = qx/\/sbin\/tc -s class show dev $ARGV[0]|grep $ARGV[1] -A 2/;
if ($ARGV[2] eq ifOutOctet)     {
        ($output) = (@data[1] =~ /.+Sent\s+(\d+)\s.+/);
        }
elsif ($ARGV[2] eq ifOutPkt)    {
        ($output) = (@data[1] =~ /.+bytes\s+(\d+)\s.+/);
        }
elsif ($ARGV[2] eq dropped)     {
        ($output) = (@data[1] =~ /.+dropped\s+(\d+),.+/);
        }
elsif ($ARGV[2] eq backlog)     {
        ($output) = (@data[2] =~ /.+backlog\s+\d+b\s(\d+)p.+/);
        }
elsif ($ARGV[2] eq capacity)    {
        ($current) = (@data[2] =~ /.+rate\s+(\d+)Kbit.+/);
        ($denom) = (@data[0] =~ /.+ceil\s+(\d+)Kbit.+/);
        ($output) = $current/$denom;
        }
print "$output\n"

those scripts I installed onto the target system (in my case the vyatta routers), and created UserParameters to call my scripts from the zabbix agent:

### Option: UserParameter: TC discovery
UserParameter=net.tc.class.discovery[*],/config/scripts/tc_class_discovery.pl $1

### Option: UserParameter: TC Stats
UserParameter=net.tc.stats[*],/config/scripts/tc_stats.pl $1 $2 $3

Then I setup a LLD rule using the net.tc.class.discovery[tc_device] key,


and filters to only match against the leaf htb classes


Setup the discovery items ame way using the UserParameter


Made a graph template


and Voila