Pandu E Poluan wrote:
Without "allow-miss", I get the error:
*Valid document was not found in the cache and only-if-cached directive
was specified.*
Okay, bet use it then. Should be safe enough in your setup.
Amos
Strangely, doing the same on ProxyC causes an "Access Denied" error...
Rgds
[p]
Amos Jeffries wrote:
Pandu E Poluan wrote:
Okay, some experimentations I made:
I added the following lines on ProxyB:
# lines from Amos' tip
acl fastsites dstdomain .need-fast-inet.com
acl fastsites dstdomain .another-need-fast-inet.com
never_direct allow fastsites
Changes on ProxyA:
# lines from Amos' tip
acl fastsites dstdomain .need-fast-inet.com
acl fastsites dstdomain .another-need-fast-inet.com
# also from Amos' tip
miss_access allow fastsites
miss_access deny siblings
miss_access allow all
# and this one from Amos' tip
always_direct allow fastsites
My browser can't access .need-fast-inet.com
I further changed the following lines to ProxyB:
# added "weight=2 allow-miss"
cache_peer ProxyA sibling 3128 4827 htcp weight=2 allow-miss
# added the following line
neighbor_type_domain ProxyA parent .need-fast-inet.com
.another-need-fast-inet.com
Now, I can access .need-fast-inet.com through ProxyB.
But, isn't that "allow-miss" dangerous?
Any comments?
It's dangerous to use it widely. And particularly on both ends of the
peering link (ie DONT place it in proxyA config for proxyB/C).
It's safe to do on a one-way link. The miss_access controls you have
in place at each of your Squid perform explicitly the same actions. So
AFAIK you should not hit any of the loop cases that may occur.
Test without the 'allow-miss' option though. I believe the setting
neighbor_type_domain disables it more specifically for the objectX
requests via the change to parent link.
Amos
Rgds.
[p]
Pandu E Poluan wrote:
Hmmm... strange...
Now, instead of accessing the site objectX, ProxyB and ProxyC users
can't access the site at all...
But no SQUID error page shows up... the browser simply times out...
Accessing URLs other thatn objectX still works...
objectX is accessible via ProxyA, though.
The changes I made currently:
On ProxyA:
acl objectX dstdomain ...
miss_access allow objectX
always_direct allow objectX
On ProxyB/C:
acl objectX dstdomain ...
never_direct allow objectX
I'll experiment with the settings... maybe also "miss_access allow
objectX" on ProxyB and ProxyC?
Rgds.
Pandu E Poluan wrote:
Aha! Thanks a lot, Amos :-)
I have been suspicious all along that the solution uses miss_access
and never_direct ... but never saw an example anywhere.
Again, much thanks!
** rushes to his proxies to configure them **
Rgds.
[p]
Amos Jeffries wrote:
Pandu E Poluan wrote:
The URL is allowed to be accessed by everyone, ProxyA-users, and
ProxyB/C-users alike.
I just want the URL to be retrieved by ProxyA, because accessing
that certain URL through ProxyB/C is too damn slow (pardon the
language).
Rgds.
Okay. Thought it might be something like that, just wanted to be
sure before fuzzing the issue.
You will need to create an ACL just for this URL (an others you
want to do the same).
acl objectX ...
proxyA needs to allow peers past the miss_access block.
proxyA:
miss_access allow objectX
miss_access deny siblings
miss_access allow all
siblings must never go direct to the object (always use their
parent peer)
proxyB/proxyC:
never_direct allow objectX
Amos
Amos Jeffries wrote:
Pandu E Poluan wrote:
Anyone care to comment on my email?
And another question: Is it possible to use miss_access with a
dstdomain acl?
Rgds.
Pandu E Poluan wrote:
Hi,
I want to know is there a way to force a URL to be retrieved
by only a certain proxy, while ensuring that meshing works.
Here's the scenario:
I have a ProxyA ==> connects to Internet via a fast connection
"InetFast"
This proxy is used by a group of users that really need fast
connection.
I have other proxies ProxyB & ProxyC ==> connects to Internet
via a slower connection "InetSlow"
These proxies are used by the rest of the staff.
I configured them all as siblings, with miss_access blocking
MISS requests between them, e.g.
# Configuration snippet of ProxyA
cache_peer <ProxyB> sibling 3128 4827 htcp
cache_peer <ProxyC> sibling 3128 4827 htcp
acl siblings src <ProxyB>
acl siblings src <ProxyC>
miss_access deny siblings
miss_access allow all
ProxyB & ProxyC both has similar config.
( The aim is to 'assist' other staffers using InetSlow so that
whatever has been retrieved by the InetFast users will be made
available to the rest of the staffs )
Now, let's say there's this URL http://www.need-fast-inet.com/
that I want to be retrieved exclusively by ProxyA.
How would I configure the peering relationships?
If you can state the problem and the desired setup clearly in
single-sentence steps you have usually described the individual
config settings needed.
Is the URL allowed to be fetched by the slow users through
proxyB into proxy A and then internet?
Amos
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