Author: markt
Date: Tue Aug 13 15:52:06 2024
New Revision: 1919873
URL: http://svn.apache.org/viewvc?rev=1919873&view=rev
Log:
Migrate ACEU 2012
Added:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf
(with props)
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf
(with props)
Modified:
tomcat/site/trunk/docs/presentations.html
tomcat/site/trunk/xdocs/presentations.xml
Modified: tomcat/site/trunk/docs/presentations.html
URL:
http://svn.apache.org/viewvc/tomcat/site/trunk/docs/presentations.html?rev=1919873&r1=1919872&r2=1919873&view=diff
==============================================================================
--- tomcat/site/trunk/docs/presentations.html (original)
+++ tomcat/site/trunk/docs/presentations.html Tue Aug 13 15:52:06 2024
@@ -656,10 +656,10 @@ Apache Tomcat project (markt)
<div class="subsection"><h4
id="ApacheCon_Europe,_October_2012_(Sinsheim)">ApacheCon Europe, October 2012
(Sinsheim)</h4><div class="text">
<ul>
<li>Apache Tomcat 8 Preview (markt)
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat8-preview.pdf";>pdf</a></li>
+<a href="presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf">pdf</a></li>
<li>Apache Tomcat Reverse Proxies (markt)
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat-Reverse-proxies.pdf";>pdf</a>,
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat-Reverse-proxies-notes-rjung.txt";>notes</a>
(rjung)</li>
+<a href="presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf">pdf</a>,
+<a
href="presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt">notes</a>
(rjung)</li>
</ul>
</div></div>
Added:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt
URL:
http://svn.apache.org/viewvc/tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt?rev=1919873&view=auto
==============================================================================
---
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt
(added)
+++
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt
Tue Aug 13 15:52:06 2024
@@ -0,0 +1,18 @@
+- mod_jk documentation is hidden underneath "Tomcat Connectors". Don't use
docs from other sites.
+
+- mod_proxy is much better prepared to do URL rewriting because of the
pre-cooked Proxy directives. Doing the same with mod_headers is hard to get
right. You indirectly mentioned that.
+
+- sometime the /foo -> /bar mapping actually is of the form / -> /bar because
marketing wants to strip the first URL segment. Since URL rewriting is so bad,
admins should try to convince marketing, that a simple redirect from / to /bar
solves the most important problem, namely a simple start page. Of course when
using the app, the /bar gets visible, but the simple start URL can be publishd
without getting into the nasty business of doing rewrites for every request etc.
+
+- you talked about complex rules for balancing could be done easier with
mod_rewrite. When using mod_jk, you can set either the env var JK_WORKER_NAME
to the name of the worker you want the request to be sent to, or when using a
balancer use env var JK_ROUTE to dictate which of the balanced worker should
handle a request. It is documented at the end of the page
http://tomcat.apache.org/connectors-doc/reference/apache.html. Setting the env
var could be done using mod_setenvif or mod_rewrite but you can keep the worker
definitions etc. separate from the complex routing rule.
+
+- management, monitoring: In my opinion the jk status worker is much better
than the current proxy GUI.
+
+- default balancer algorithm: the default request counting algorithm that the
proxy balancer uses was thrown out of mod_jk some years ago, because it doesn't
behave nicely once a worker was not getting load due to being disabled or on
error. When it comes back, things behave strangely. We were talking here about
probably reüplacing that algorithm in mod_proxy_balancer as well (only Apache
2.4 or beyond).
+
+- we already talked about the https and persistant connections/handshake
stuff. Suggestion would be to always use persistant connections then and tune
the connector keep alive settings on the tomcat side.
+
+- mod_sed and friends: you mentioned correctly that they are not easy to
configure, one could stress the fact that often the config is a maintenance
nightmare, ie. whenever the backend application gets updated there is a chance,
that you have to adjust rules.
+
+- the thread sizing problem: it really gets bad if we talk about a bigger farm
of Apache instances in front of Tomcat. Apart from using NIO/APR one can also
try to reduce the needed thread count by using preferences between Apache
instances and tomcat instances (declare some Tomcats for each Apache to be
closer using the distance attribute). This will keep most traffic in a smaller
group, but still allow Apache to contact each Tomcat in case the close ones are
down or a load balancer in front did a misrouting of a request, so Apache has
to correct it by sending the request to a Tomcat further away. Then the
connections to the close Tomcats will be reused very frequently, and the ones
to the Tomcats with higher "distance" will have evry little reuse. Next use
more threads per Apache process, then the likelihood, that those threads will
only need very few connections to the Tomcat with higher difference increases
(connections request gets better). Finally use a relatively small idle c
onnection timeout for the Tomcats with higher difference. Not perfect, but
helps. Downside: Currently new sessions will always be created on the Tomcats
with smales distance, even if only one of theose is remaining. A threshold to
control, after how many failed instances mod_jk already uses the next level of
distance is not yet implemented.
+
Added:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf
URL:
http://svn.apache.org/viewvc/tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf?rev=1919873&view=auto
==============================================================================
Binary file - no diff available.
Propchange:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf
------------------------------------------------------------------------------
svn:mime-type = application/octet-stream
Added:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf
URL:
http://svn.apache.org/viewvc/tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf?rev=1919873&view=auto
==============================================================================
Binary file - no diff available.
Propchange:
tomcat/site/trunk/docs/presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf
------------------------------------------------------------------------------
svn:mime-type = application/octet-stream
Modified: tomcat/site/trunk/xdocs/presentations.xml
URL:
http://svn.apache.org/viewvc/tomcat/site/trunk/xdocs/presentations.xml?rev=1919873&r1=1919872&r2=1919873&view=diff
==============================================================================
--- tomcat/site/trunk/xdocs/presentations.xml (original)
+++ tomcat/site/trunk/xdocs/presentations.xml Tue Aug 13 15:52:06 2024
@@ -664,10 +664,10 @@ Apache Tomcat project (markt)
<subsection name="ApacheCon Europe, October 2012 (Sinsheim)">
<ul>
<li>Apache Tomcat 8 Preview (markt)
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat8-preview.pdf";>pdf</a></li>
+<a href="presentations/2012-10-aceu-Apache-Tomcat8-preview.pdf">pdf</a></li>
<li>Apache Tomcat Reverse Proxies (markt)
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat-Reverse-proxies.pdf";>pdf</a>,
-<a
href="https://home.apache.org/~markt/presentations/2012-10-Apache-Tomcat-Reverse-proxies-notes-rjung.txt";>notes</a>
(rjung)</li>
+<a href="presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies.pdf">pdf</a>,
+<a
href="presentations/2012-10-aceu-Apache-Tomcat-Reverse-proxies-notes-rjung.txt">notes</a>
(rjung)</li>
</ul>
</subsection>
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