Here is some more information on my previous question. The
configuration, test requests and logs are listed below.
Configuration on squid A (http port 7129):
------------------------------------
http_port 7129 accel defaultsite=vmdevcagpcna01.firstamdata.net
acl ACLGPLSites dstdomain vmdevcagpcna01.firstamdata.net
acl ACLSquidPeers src 192.168.54.65
http_access allow ACLGPLSites
icp_access allow ACLSquidPeers
#miss_access allow ACLSquidPeers
# origin app server is vmdevcagpcna01 (192.168.54.64:7533)
cache_peer vmdevcagpcna01.firstamdata.net parent 7533 0 no-query
originserver name=OriginGPLServer
cache_peer 192.168.54.65 sibling 7130 7230 name=GPLCache2 proxy-only
cache_peer_access OriginGPLServer allow ACLGPLSites
cache_peer_access GPLCache2 allow ACLGPLSites
icp_port 7229
# allow purge method from localhost
acl PURGE method purge
acl localhost src 192.168.54.65
http_access allow purge localhost
http_access deny purge
-----------------------------------
Configuration on squid B (http port 7130):
------------------------------------
http_port 7130 accel defaultsite=vmdevcagpcna01.firstamdata.net
acl ACLGPLSites dstdomain vmdevcagpcna01.firstamdata.net
acl ACLSquidPeers src 192.168.54.65
http_access allow ACLGPLSites
icp_access allow ACLSquidPeers
#miss_access allow ACLSquidPeers
# origin app server is vmdevcagpcna01 (192.168.54.64:7533)
cache_peer vmdevcagpcna01.firstamdata.net parent 7533 0 no-query
originserver name=OriginGPLServer
cache_peer 192.168.54.65 sibling 7129 7229 name=GPLCache1 proxy-only
cache_peer_access OriginGPLServer allow ACLGPLSites
cache_peer_access GPLCache1 allow ACLGPLSites
icp_port 7230
# allow purge method from localhost
acl PURGE method purge
acl localhost src 192.168.54.65
http_access allow purge localhost
http_access deny purge
------------------------------------
The sequence of requests that I sent was:
------------------------------------
./squidclient -h 192.168.54.65 -p 7129 -m HEAD -H "Cache-Control:
only-if-cached\n"
"http://vmdevcagpcna01.firstamdata.net/gis/v1.6.3/wms?REQUEST=GetMap&SER
VICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRU
E&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:property_
layer&QuadKey=0230132002300312230"
./squidclient -h 192.168.54.65 -p 7130 -m HEAD -H "Cache-Control:
only-if-cached\n"
"http://vmdevcagpcna01.firstamdata.net/gis/v1.6.3/wms?REQUEST=GetMap&SER
VICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRU
E&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:property_
layer&QuadKey=0230132002300312230"
./squidclient -h 192.168.54.65 -p 7130
"http://vmdevcagpcna01.firstamdata.net/gis/v1.6.3/wms?REQUEST=GetMap&SER
VICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT=TRU
E&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:property_
layer&QuadKey=0230132002300312230"
------------------------------------
Access.log from Squid A:
------------------------------------
1246040022.545 0 192.168.54.65 TCP_MEM_HIT/200 274 HEAD
http://vmdevcagpcna01.firstamdata.net:7129/gis/v1.6.3/wms?REQUEST=GetMap
&SERVICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT
=TRUE&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:prope
rty_layer&QuadKey=0230132002300312230 - NONE/-
application/vnd.ogc.se_xml
1246040041.305 0 192.168.54.65 UDP_MISS/000 274 ICP_QUERY
http://vmdevcagpcna01.firstamdata.net:7130/gis/v1.6.3/wms?REQUEST=GetMap
&SERVICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT
=TRUE&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:prope
rty_layer&QuadKey=0230132002300312230 - NONE/- -
-------------------------------------
Access.log from Squid B:
-------------------------------------
1246040028.217 0 192.168.54.65 TCP_MISS/504 290 HEAD
http://vmdevcagpcna01.firstamdata.net:7130/gis/v1.6.3/wms?REQUEST=GetMap
&SERVICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT
=TRUE&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:prope
rty_layer&QuadKey=0230132002300312230 - NONE/- text/html
1246040041.391 86 192.168.54.65 TCP_MISS/200 5762 GET
http://vmdevcagpcna01.firstamdata.net:7130/gis/v1.6.3/wms?REQUEST=GetMap
&SERVICE=WMS&VERSION=1.1.1&FORMAT=image/png&BGCOLOR=0xFFFFFF&TRANSPARENT
=TRUE&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&reaspect=false&LAYERS=GPL:prope
rty_layer&QuadKey=0230132002300312230 - FIRST_UP_PARENT/OriginGPLServer
image/png
-------------------------------------
As you can see that, A has the object(TCP_MEM_HIT), while B does
not(TCP_MISS). But when a request for the object is sent to B, A gets a
UDP_MISS with a URL having squid B's port number 7130 in it. I don't
understand why.
Thanks!
Roy
-----Original Message-----
From: Lu, Roy [mailto:rlu_at_FACorelogic.com]
Sent: Friday, June 26, 2009 10:28 AM
To: squid-users_at_squid-cache.org
Subject: [squid-users] Problem with siblings running on different http
ports
Dear list,
I have two squid sibling caches in accelerator mode with different http
ports (squid A port 3128 and squid B 3129). Both point to the same back
end origin server. When i used the squidclient to test them, I made sure
squid A has a requested object in cache(TCP_HIT), while squid B does
not(TCP_MISS).
Now when I send a request to B, I can see a message in A's access log
with UDP_MISS status, but the ICP_QUERY url contains B's http port 3129.
So the result is B goes to the backend sever to get the object, instead
of from A.
Why does the ICP_QUERY have the requesting silbling's http port?
Thanks,
Roy
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Received on Fri Jun 26 2009 - 18:21:10 MDT
This archive was generated by hypermail 2.2.0 : Sat Jun 27 2009 - 12:00:03 MDT