a issue when running the "Simple tests" with a proxy
xu alex
thealex.xu1986 at gmail.com
Tue Mar 11 06:23:00 UTC 2014
Hi Alex，
Thanks for your reply. Yes, I has been testing squid using as a reverse
proxy. I tried the way of adding PGL AddrMap in my config file, but errors
showed up when starting polygraph-client. My config file is as following:
----------------------------------------------------------------------------------------------------------------------------------
ObjLifeCycle olcStatic = {
birthday = now + const(-1year); // born a year ago
length = const(2year); // two year cycle
variance = 0%; // no variance
with_lmt = 100%; // all responses have LMT
expires = [nmt + const(0sec)]; // everything expires when modified
};
Content SimpleContent = {
size = exp(13000KB); // response sizes distributed exponentially
cachable = 100%; // 20% of content is uncachable
obj_life_cycle = olcStatic;
};
Server S = {
kind = "S101";
contents = [ SimpleContent ];
direct_access = contents;
addresses = ['218.202.111.138:80']; // where to create these server
agents
};
AddrMap Map = {
addresses = S.addresses;
names = ['218.202.111.5:8101'];
};
// a primitive robot
Robot R = {
kind = "R101";
pop_model = { pop_distr = popUnif(); };
recurrence = 55% / SimpleContent.cachable; // adjusted to get 55%
DHR
req_rate = 10/sec;
origins = Map.names; // where the origin servers are
addresses = ['218.202.111.138' ** 10]; // where these robot agents
will be created
};
// commit to using these servers and robots
use(S, R);
The error info showed up when i started polygraph-clients is as following:
------------------------------------------------------------------------------------------------------------------------------------------------------
fyi: PGL configuration stored (664bytes)
000.00| fyi: all 10 Robot IP address(es) lack interface name or netmask
000.00| found 10 Robot IP address(es) total (0 unique address(es) with
interface name and netmask).
000.00| fyi: no bench selected with use()
000.00| ./my_simple.pg:41: error: Robot cannot find configuration for
server at 218.202.111.5:8101
I am a newer for polygraph, and can not unstand WebAxe workload
configuration completely, so i think there are some mistakes in my
configuration file. Can you help me take a look at my config file showed
above for which part is wrong, and how i should modify it?
Currently, I just modify the source code as following to make it work
with my squid server:
---------------------------------------------------------------------------------------------------------------------------------------
ostream &Oid2Url(const ObjId &oid, ostream &os) {
if (oid.foreignUrl())
return os << oid.foreignUrl();
if (oid.secure())
os << "https://";
else
- os << (oid.scheme() == Agent::pHTTP ? "http://" : "ftp://");
+ os << (oid.scheme() == Agent::pHTTP ? "/" : "ftp://");
Oid2UrlHost(oid, false, os);
Oid2UrlPath(oid, os);
return os;
}
I think that is not right way to use polygraph for test reverse proxy, so
look forward to your reply!
2014-03-11 0:05 GMT+08:00 Alex Rousskov <rousskov at measurement-factory.com>:
> On 03/10/2014 02:02 AM, xu tony wrote:
> > I've been using the "Simple tests" introdued by polygraph's User
> > manual to test my squid server. During testing, I found my squid can't
> > pull the resource from orign(that is polygraph-server) successfully.
>
> > 3、The command i used for starting polygraph-server and polygraph-client
> > is ,
> > /usr/local/polygraph/bin/polygraph-client --config
> > ../workdir/my_simple.pg --verb_lvl 10 --proxy
> > 218.202.111.5:8101
>
>
> > During test, i found squid have got requests from
> > ploygraph-client,but using a wrong url to pull resource (that is
> > polygraph-server).Part of my squid access log is showed as below:
> >
> --------------------------------------------------------------------------------------------------------------
> > 218.202.111.138 - - [10/Mar/2014:15:58:49 +0800] "GET
> > http://w1cbc2601.7f1c694f:8/t03/_00000003 HTTP/1.1" 503 1513 "-" "-"
> > TCP_MISS DIRECT 0 -
>
> The wrong domain name in the above log implies that your Squid is
> confused as to where the requests are going. This would not happen with
> a regular Squid configuration. Starting with a simple forward proxy
> configuration for Squid may be a good idea before moving on to more
> complex stuff (squid.conf.default may work after adding http_access
> rules to allow Polygraph traffic).
>
>
> > I snapped http-request packets from polygraph-client, and found
> > request-line of http-request is not what squid expected,which caused the
> > squid can't pull resource from polyserver.The request-line in
> > http-request sent by polyclient is like that :
> > "GET http://218.202.111.138/w1cbc0feb.0fea1bae:00000008/t03/_00000001
> > HTTP/1.1"
>
> Yes, this is what you told Polygraph to send. In a forward proxy test
> that you are running (from Polygraph point of view), the URL should look
> like the one logged above.
>
>
> > The right request-line which the squid expected ,i think, shoud be like:
> > "GET /218.202.111.138/w1cbc02ee.0c726ba0:00000008/t03/_00000015HTTP/1.0"
>
> No, but if you are testing a reverse proxy, the Request URI that Squid
> expects should look like this:
>
> GET /w1cbc02ee.0c726ba0:00000008/t03/_00000015 HTTP/...
>
> It would still be logged as a full URL (with a host name) by Squid IIRC,
> but the packet capture should show from-Polygraph Request URIs without
> the protocol scheme and host name components.
>
> Please note that some packet capture GUIs such as Wireshark sometimes
> "restore" the full URL when rendering high-level details of the captured
> packet, even when a full URL is not present in the packet. Make sure you
> look at what has been actually sent and what what was rendered by GUI.
>
>
> > So, i want to know which part is wrong in my test, if i have made
> > some mistakes in test, or polyclient sent http-request with wrong
> > request-line, or my squid had some problems ,or anything else? How can i
> > fix it?
>
> You have configured Polygraph for a forward proxy test (the --proxy
> option does that). One possibility is that you have also configured your
> Squid to be a reverse proxy. If the two configurations are out of sync,
> bad things like the one you have described may happen.
>
> If you want to test a reverse proxy, you have to change Polygraph
> configuration. Do not use --proxy at all (reverse proxies are origin
> servers from the HTTP protocol point of view). Add a PGL AddrMap that
> maps proxy address (218.202.111.5:8101) to the Polygraph server address
> (S.addresses). And use map.names for Robot's origins field (R.origins)
> instead of S.addresses you are using there now. The WebAxe workload
> configuration distributed with Polygraph has a [more complex] example on
> how to do that.
>
> If you do not want to test a reverse proxy, reconfigure your Squid to be
> a regular forward proxy (starting with squid.conf.default may be a good
> idea).
>
>
> HTH,
>
> Alex.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.web-polygraph.org/pipermail/users/attachments/20140311/0b90b574/attachment.html>
More information about the Users
mailing list