Windows - Create file to test filesystem - utility

To create a file filled with zero's on windows;

fsutil file createnew name-of-file.txt 2000 (this is the length in bytes)

This will create a new file with 2000 bytes.

This can usefull for copy / perfomance disk testing.

.
.

Varnish - cache "invention" - Load balacing squid's

I tested load balacing squid proxys with HAproxy, and it was nice, then i had a crazy thought;

"what if i used varnish, and load-balance "and" cache at the same time...?"

Varnish its a great software for reverse-caching webservers... i'm not using it for what it was created, but i had this crazy idea...:P

Well, i took varnish and started "inventing" a way...

This is my setup to load-balance and cache, with varnish, 3 squid's :P (yep, crazy i know):

Request---> varnishd:8080 --> refered has "webfarm"
            /    |    \
           /     |     \
       proxy1  proxy2  proxy3

config file: default.vcl

 backend proxy1 {
     .host = "10.30.1.171";
     .port = "8080";
 }


 backend proxy2 {
     .host = "10.30.1.172";
     .port = "8080";
 }

 backend proxy3 {
     .host = "10.30.1.173";
     .port = "8080";
 }

 director webfarm round-robin {
 {
  .backend = proxy1;
 }
 {
  .backend = proxy2;
 }
 {
  .backend = proxy3;
 }
 }

 sub vcl_recv {
  if (client.ip == "10.1.5.10" )
   { set req.backend = webfarm; }
}.

Well it worked...but i'm not very sure about the perfomance...varnish was not created for this :P

.

HAproxy - LoadBalancer - balancing 3 squid's

Trying to loadbalance requests across 3 squid-cache proxys, very nice, i'm enjoiyng HAproxy a lot, great software.

Here it goes:

Client request <-----> HAproxy <---> squid1 \ 

                               <---> squid2  -- web

                               <---> squid3 /

Config file: haproxy.cfg

global
        log 127.0.0.1   local0
        log 127.0.0.1   local1 notice
        #log loghost    local0 info
        maxconn 4096
        #nbproc 2
        #chroot /usr/share/haproxy
        user haproxy
        group haproxy
        daemon
        #debug
        #quiet

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        retries 3
        option redispatch
        maxconn 2000
        contimeout      5000
        clitimeout      50000
        srvtimeout      50000


# reverse proxy-squid
listen  webfarm 0.0.0.0:8000
        mode http
        cookie  SERVERID insert indirect nocache
        balance roundrobin
        option httpclose
        option forwardfor header X-Client
        server  squid1 10.30.1.171:8080 check inter 2000 rise 2 fall 5
        server  squid2 10.30.1.172:8080 check inter 2000 rise 2 fall 5
        server  squid3 10.30.1.173:8080 check inter 2000 rise 2 fall 5


listen admin_stats 0.0.0.0:81
        mode http
        stats uri       /stats
        stats realm     Global\ statistics
        stats auth      username:password

        #errorloc       502     http://192.168.114.58/error502.html
        #errorfile      503     /etc/haproxy/errors/503.http
        errorfile       400     /etc/haproxy/errors/400.http
        errorfile       403     /etc/haproxy/errors/403.http
        errorfile       408     /etc/haproxy/errors/408.http
        errorfile       500     /etc/haproxy/errors/500.http
        errorfile       502     /etc/haproxy/errors/502.http
        errorfile       503     /etc/haproxy/errors/503.http
        errorfile       504     /etc/haproxy/errors/504.http
 
------------------------------ EOF ------------------------------------


.

To access the haproxy stats, use: (the "uri" defined)
http://webfarm:81/stats

Well it works, very nice, and it does backend servers check, and statistics NICE !

.