drwilco

Service Chaining

CDN token demo

drwilco

log=$(cat -)
request=$(echo "$log" | grep -E "^ *[0-9]+ TxRequest" | sed -E 's/^ *[0-9]+ TxRequest *b //')
url=$(echo "$log" | grep -E "^ *[0-9]+ TxURL" | sed -E 's/^ *[0-9]+ TxURL *b //')
headers=$(echo "$log" | grep -E "^ *[0-9]+ TxHeader" | sed -E 's/^ *[0-9]+ TxHeader *b (.*)$/-H "\1"/' | paste -s -d ' ' | sed 's/\!/\\\!/g')
read backend lip lport rip rport ssl <<<$(echo "$log" | grep -E "^ *[0-9]+ Backend(Addr|Open)" | sed -E 's/^ *[0-9]+ Backend(Addr|Open) *b //')

if [ "$f" = "SSL" ]; then 
  proto="https"
else
  proto="https"

drwilco

(gdb) i br
Num     Type           Disp Enb Address            What
3       hw watchpoint  keep y                      *(void **)0x604030
        breakpoint already hit 7532228 times
        silent
        if $_siginfo->_sifields->_sigfault->si_addr == 0x7ffff7bd80e1 || *(void **)0x604030 == 0x7ffff2414048
          cont
        else
          bt
        end

drwilco

objdump -S /usr/sbin/varnishd | awk '/00000000004836f0/ {flag=1;next}
/0000000000483a30/{flag=0} flag {print}' | while read addr asm
do
  line=`addr2line -i -e /usr/sbin/varnishd $addr`
  if [ "x$line" != "x$last" ]
  then
    echo "$addr $line"
  fi
  echo "$asm"
  last="$line"

drwilco

/* gcc -o timebench timebench.c -lrt -O2 -fno-inline */
/* no-inline for better readable objdump -d output   */
#include <time.h>
#include <sys/time.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

drwilco

drwilco@guari:~$ pstree -hp 23944
bash(23944)───grep(2832)─┬─grep(2836)
                         └─yes(2835)

(23944 is the interactive shell that I used to start test.sh)

drwilco

varnishd -d -f ~/test-directors.vcl -C | grep VGC
#define VGCDIR(n) VCL_conf.director[VGC_backend_##n]
#define VGC_backend__b1 1
#define VGC_backend__b2 2
#define VGC_backend__rr 3
#define VGC_backend__rnd 4
#define VGC_backend__cl 5
#define VGC_backend__hsh 6
#define VGC_backend_dyn_1 1
#define VGC_backend_dyn_2 2

drwilco

                                     My traceroute  [v0.73]
brigit.drwilco.net (0.0.0.0)                                            Thu Oct 13 11:57:16 2011
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                        Packets               Pings
 Host                                                 Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 5ED13001.cm-7-2a.dynamic.ziggo.nl                  0.0%     9    7.0   7.2   5.7  10.9   1.6
 2. gv-rc0052-ds102-vl202.core.as9143.net              0.0%     9    5.0   7.5   5.0  10.7   1.9
 3. gv-rc0011-cr102-ae12-0.core.as9143.net             0.0%     9    7.2   8.4   6.0  11.9   1.6
 4. asd-tr0409-cr101-ae8-0.core.as9143.net             0.0%     9    6.6  26.2   6.6  82.0  28.8
 5. tengigabitethernet1-3.ar2.ams1.gblx.net            0.0%     8    9.5   8.3   6.5  10.0   1.4

drwilco

Script started on Fri 09 Sep 2011 10:12:18 PM PDT
drwilco@guari:~/dev/varnish$ git clone git://git.varnish-cache.org/varnish-cache 2.1

Cloning into 2.1...

remote: Counting objects: 48004, done.

remote: Compressing objects:   0% (1/14738)   
remote: Compressing objects:   1% (148/14738)   
remote: Compressing objects:   2% (295/14738)   

drwilco

lxc.network.type = veth
lxc.network.flags = up
lxc.network.name = eth0
lxc.network.link = virbr0
lxc.network.ipv4 = 10.13.37.2/24