Caching Proxy Solution Squid
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Simon Eickel (1.1k●7●54●57)
| asked Apr 05 '13, 9:56 a.m.
retagged May 09 '13, 10:39 a.m. by Arne Bister (2.6k●1●28●32)
Hello together,
currently I'm facing a problem getting the caching proxy solution with squid running. I know this article Using content caching proxies for Jazz SCM and tried to setup a squid server running on RHEL 5.8 My Jazz server is running on Windows Server 2008 RC2 and is working on a WAS 7. On the same server I have a reverse proxy running so that the URL of the RTC is https://jazzdev.rsint.net/ccm After setting up the Squid solution described in the article above we could connect to it using cURL on the same machine. When using the Jazz SCM or the Eclipse or Browser on another windows client we where not able to connect to the Jazz server using the proxy. We search for any issues and extended the configuration of squid for the parts we found on the www. Our configuration is this now:
Now I can connect to the proxy and can download files using Eclipse. The Jazz scm refuses the connection with a "forbidden" error message. But my main problem is: Even when loading files using Eclipse the caching proxy is caching .... nothing .... Anybody any ideas why the cache is not getting filled ? Greetings, Simon
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hm.. here is my squid.conf
<code> cache_replacement_policy heap GDSF memory_replacement_policy heap GDSF cache_dir aufs /usr/local/squid/var/cache 10240 256 256 cache_mem 1024 MB cache_store_log stdio:/usr/local/squid/var/logs/cachelog cache_peer 192.168.2.106 parent 9743 0 no-query originserver name=httpsAccel ssl login=PROXYPASS sslflags=DONT_VERIFY_PEER cache_peer 192.168.2.106 parent 9843 0 no-query originserver name=httpsAccel1 ssl login=PROXYPASS sslflags=DONT_VERIFY_PEER cache_peer 192.168.2.106 parent 9643 0 no-query originserver name=httpsAccel2 ssl login=PROXYPASS sslflags=DONT_VERIFY_PEER https_port 9743 cert=/usr/local/squid/etc/server.pem accel key=/usr/local/squid/etc/privkey.pem vhost https_port 9843 cert=/usr/local/squid/etc/server.pem accel key=/usr/local/squid/etc/privkey.pem vhost https_port 9643 cert=/usr/local/squid/etc/server.pem accel key=/usr/local/squid/etc/privkey.pem vhost acl ccm1 port 9743 acl ccm2 port 9843 acl ccm3 port 9643 #cache_peer_access httpsAccel allow ccm1 #cache_peer_access httpsAccel deny ccm2 ccm3 #cache_peer_access httpsAccel allow all #cache_peer_access httpsAccel1 allow ccm2 #cache_peer_access httpsAccel1 deny ccm1 ccm3 #cache_peer_access httpsAccel2 allow ccm3 #cache_peer_access httpsAccel2 deny ccm1 ccm2 coredump_dir /usr/local/squid/var/cache http_access allow ccm1 #http_access allow ccm2 #http_access allow ccm3 refresh_pattern . 0 20% 40320 cachemgr_passwd disable all maximum_object_size 5120 MB maximum_object_size_in_memory 16 MB buffered_logs on visible_hostname 192.168.2.32 </code> |
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correct.. the proxy IS the RTC server from all clients. we do not use the formal 'passthru proxy' configuration.
on my dev system, I changed the DNS entry for the RTC server to use the IP address of the squid server and the clients didn't have to do anything. the squid url rewrite cannot change the structure of the URL.. Eclipse is sensitive to that.. so https://server:port/context must remain https://realserver/context, it cannot change to https://realserver or https://realserver/context/context2 Comments Hi Sam,
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the article says
Using a Reverse Accelerator ProxyYou can also configure squid or apache httpd (with the mod_cache module) to run as a accelerator proxy server against your Jazz RTC Team Server. The strategy here is that instead of referencing the Jazz RTC Team Server URI from your client, you would connect instead to a proxy server which forwards all requests onto the Jazz RTC Team Server.Note: For best results in using a reverse accelerator proxy, clients should start new eclipse, command line or visual studio sandboxes. There can be issues in switching between different repository URIs pointing to the same repository from within the clients. Setting up Squid with HTTP as Accelerator Proxy
there is also talk of the forward proxy, at the beginning, but not much. The accelerator reverse caching proxy works.. we will have a number of them thruout our network. some near the servers in our central site, and one at some of our remote locations. the proxy servers will also talk to each other as siblings (cache peers) this is a typical multi-proxy design used for web technology for years. the design is twin purposed: 1. remove as much redundant traffic from the server as possible, and 2. for remote locations, provide as close to local lan speeds as possible.
For builds this reduces the loading time from hours to minutes. slightly slower that the original local lan setup the users had before moving to the central admin structure
the DNS server at the locations (local or remote) will direct the users application (eclipse, Windows, or Browser, or SCM tools) to the caching proxy nearest them, to provide the fastest speeds possible.
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Can you post a sample of your access log? It is saying "TCP_MISS" ?
Hi John,
yes, very much TCP_MISS messages:
Greetings,
Simon
I don't see any lines in that output which say IVersionedContentService ... can you grep/show the part of the log where that service is being accessed?
Hi John, there are now such entries inside the log...
For clarity : The lines with IVersionedContentService say TCP_MISS ?
Hi John, sorry there was a char too much inside my answer ...
I meant "there are no such entries inside the log".
I just see TCP_MISS entries ... nothing else.
At the moment I connect the client using the proxy entries inside network configuration.
In eclipse e.g. I connect directly to the jazz server and have the network configured to use a proxy. Is this wrong?
Running squid -v prints:
rbroot@t-wsg01# sbin/squid -v
Squid Cache: Version 3.0.STABLE26
configure options: '-prefix=/usr/local/squid' '--with-pthreads' '--enable-storeio=ufs,aufs' '--enable-removal-policies=lru,heap' '--enable-ssl' '--with-large-files' 'CFLAGS=-O2 -pipe -m64 -march=core2 -fomit-frame-pointer -s' 'LDFLAGS=-m64 -s -Wl,-O1' 'CXXFLAGS=-O2 -pipe -m64 -march=core2 -fomit-frame-pointer -s'