Centos 6 Yum Install Mod_jk
In this article, we provide a comprehensive overview of the Apache modjk connector, including configuration information, use scenarios, solutions to common problems, and a comparison of modjk to other similar connector components. Table of contentsI.II.III.IV.
The Basics - What is modjk?The modjk connector is an Apache HTTPD module that allows HTTPD to communicate with Apache Tomcat instances over the AJP protocol. The module is used in conjunction with Tomcat's AJP Connector component. About connectorsApache Tomcat uses Connector components to allow communication between a Tomcat instance and another party, such as a browser, server, or another Tomcat instance that is part of the same network.
For example, the HTTP connector listens for requests over the HTTP/1.1 protocol on various TCP ports, and forwards them to the Engine associated with processing the request.Using the AJP connector, Apache Tomcat instances can exchange data with modjk enabled instances of Apache HTTPD, using the AJP protocol. Implementations of modjk are also available for integration with IIS and NES/iPlanet/Sun, but are less widely used.About AJPAJP, an acronym for Apache Jserv Protocol, is a binary version of HTTP that is optimized for communication between Apache HTTPD and Apache Tomcat over a TCP connection. The current version of the AJP protocol is 1.3, referred to by the standard name ajp13. Ajp13 extends the earlier modjserv and ajp12 modules, offering significant speed improvements and SSL support.Other than the data format, differences between the standard HTTP and AJP protocols include more persistent connections (to avoid unnecessary socket creation) and a focus on connection reuse over a series of request/response cycles.A detailed description of the AJP protocol can be found on the Tomcat Connectors.II. Common use scenarios - Why connect HTTPD and Tomcat?One question often asked by new Tomcat users is why Tomcat and HTTPD would need to communicate at all.
After all, one of the features that makes Tomcat so flexible is its ability to function as a standalone web server and application server, thanks to the Coyote component.There are a number of reasons why you might need HTTPD and Tomcat to talk to one another.In the early days of Tomcat, one of the most common reasons to connect the two servers was to allow HTTPD to serve static content, freeing up Tomcat to process dynamic requests. However, performance improvements have made serving static content using Tomcat just as fast as on HTTPD (and sometimes faster, when the elimination of the extraneous connection is factored in).However, there are still plenty of good reasons why you might want to use the two together.Clustering, load balancing and securityHTTPD and modjk can be used to balance server load across multiple Tomcat instances, or divide Tomcat instances into various namespaces, managed by HTTPD.Apache HTTPD modules and extensions.
Apache HTTPD has been the most popular web server in the world since 1996. At this point, the number of modules that are available to extend its functionality is staggering. Adding it to Tomcat is going to take some elbow grease, but adding it to Apache is just a matter of installing downloading and installing a single module. Apache also can handle many different 'decorations' - rewrites of headers, URLs, and more.Socket error handlingUnlike Tomcat, Apache HTTPD can run natively on a system, rather than within a cross-platform JVM. For this reason, HTTPD has an advantage when it comes to handling socket errors (i.e.
Dropped/invalid connections, invalid IPs, etc), as socket optimization practices differ significantly from operating system to operating system. SecurityTomcat and HTTPD are different projects, but in some areas - security, for example - their functionality overlaps.
The only caveat is that, as with any network component, an additional system means one more point of attack you must consider when securing your infrastructure.III. Installation and configurationAs modjk allows communication between HTTPD and Apache, installing the module requires some legwork on both servers.
In this section of the article, we'll walk you through the whole process.(Note: Although not covered by this article, modjk is also compatible with IIS and NES/iPlanet/Sun. Documentation for these components is available on the Tomcat Connectors.Step 1 - Download the latest version of modjkNew versions of modjk are released as source packages, and as binary packages for select platforms. Both are available for download from the Apache Tomcat Connector.Currently, the following platforms receive binary releases: AIX, FreeBSD, iSeries, Linux, Mac OS X, Netware, Solaris, and Windows (32- and 64-bit releases).Download the most recent release. If you want to build modjk from source, follow the directions provided along with the release.Step 2 - Install the modjk moduleLocate the modjk module itself inside the release package. If you downloaded a Unix-type release, this file will be named 'modjk.so'. On a Windows system, look for 'modjk.dll'.Next, you must copy this file in the the HTTPD module directory. The location of this directory can vary from platform to platform, so if you do not know where it is located, consult the Apache HTTPD documentation.
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On Unix-based systems, the module directory is usually located within the apache directory in '/usr/lib/' or '/usr/local/', while on Windows machines in can be found within the Apache directory in 'C:Program Files'.Step 3 - Configure httpd.confNow that you've installed modjk, you need to configure it in your httpd.conf file so that you can use it. Torrent nfs underground 2 pc iso torrents. You can find httpd.conf in the 'conf' directory of your Apache HTTPD home folder.The configuration provided below, based on the Tomcat documentation, is the minimum configuration required for modjk to run correctly. Replace the placeholder paths with the correct paths and values for your system.# Load the modjk module.LoadModule jkmodule path/to/modjk.so# Declare the module for use with the element. (This only applies to versions of HTTPD below 2.x.
For 2.x and above, REMOVE THIS LINE.)AddModule modjk.c# Set path to workers.properties. We will create this file in the next step. The file will be placed in the same directory as httpd.conf.JkWorkersFile /path/to/httpd/conf/workers.properties# Set path to jk shared memory. Generally, you'll want this to point to your local state or logs directory.JkShmFile /path/to/log/httpd/modjk.shm# Where to put jk logs# Set path to jk logs.
This path should point to the same logs directory as the HTTPD accesslog.JkLogFile /path/to/log/httpd/modjk.log# Set the jk log level. Valid values for this setting are 'debug', 'error', or 'info'.JkLogLevel level# Set timestamp log format.
Use provided variables to customize.JkLogStampFormat '%a%b%d%H:%M:%S%Y '# Map a worker to a namespace. Workers represent Tomcat instances that are listening for requests. We'll configure these in the next section. For the sake of this example, Tomcat's 'examples' context is used, and a default worker named 'worker1', which we will create in Step 4, is designated.
Hi everybody.Just wanted to share my 2 cents with you in case anyone wants to FFW coupling of Apache and Tomcat with modjk (Tomcat connector).I followed some instructions found on the web but were specific for other distros (like Debian) so I have to improvise a bit. Here is my version:prerequisites:Install apache and tomcat using:yum install httpd.yum install tomcat.This way I installed Apache 2.2.15 and Tomcat 6.0.24 from CentOS-6 repo. Default config locations are:Apache: /etc/httpd/conf & /etc/httpd/conf.dTomcat: /etc/tomcat6 & /usr/share/tomcat6Now for modjk:PARTONE (installation)1. Download tomcat-connector SOURCE from mirror that can be found on tomcat dwnld pages (I found it url=)2. Copy the file (in my case tomcat-connectors-1.2.32-src.tar.gz) to /usr/src/3. Untar it: codetar xvf /usr/src/tomcat-connectors-1.2.32-src.tar.gz/code4.
Go to /native subdirectory of untared package lets say SRCHOME directory codecd /usr/src/tomcat-connectors-1.2.32-src/native/code5. Now I found instructions to run./building.sh script which wasn't able to do anything in my case since I missed a bunch of commands used inside. After reading SRCHOME/native/BUILDING.txt:) I figured out I am not a developer and don't need to run this script but can go directly to running the script./configure. Of course it reported that I need gcc which I didn't install with the OS initially so:6. Install gcc: codeyum install gcc./code7. Check that you have installed httpd-devel and have apxs (Apache eXtension tool) - I had it under /usr/sbin/apxs which was funny since I expected apxs2 which should be used for Apache 2.x7.
Anyway I run configuration script using: code./configure -with-apxs=/usr/sbin/apxs/code and the script finished successfully.8. Compile the stuff: codemake/code9. If you are lucky the you get the modjk.so file compiled in the SRCHOME/native/apache-2.0/ directory. I also received a warning after compilation saying: libtool: install: warning: remember to run 'libtool -finish /usr/lib64/httpd/modules' - which I didn't run and I hope it will not hit me in the future like a boomerang:)10. Copy modjk.so file to Apache modules directory (in my case usr/lib64/httpd/modules): codecp./apache-2.0/modjk.so /usr/lib64/httpd/modules//code11. End of part one:)PARTTWO (configuration)1. Create workers properties file in Apache configuration directory (/etc/httpd/conf/): codetouch /etc/httpd/conf/workers.properties/code2.
Put inside following lines (of course modify it per your needs and system settings):codeworker.list=worker1worker.worker1.type=ajp13worker.worker1.port=8009worker.worker1.host=localhostworker.worker1.lbfactor=1/codefor further reading please visit: url=HowTo/url or url=HowTo/url3. I created the sepparate conf file for my modjk and put it into /etc/httpd/conf.d location under name myconf.conf.codetouch /etc/httpd/conf.d/myconf.conf/codeI could do that since original Apache conf file (/etc/httpd/conf/httpd.conf) has enabled include of external conf files using directive:codeInclude conf.d/.conf/code4. Inside myconf.conf put something like:codeLoadModule jkmodule modules/modjk.soJkWorkersFile /etc/httpd/conf/workers.propertiesJkLogFile /var/log/httpd/modjklogJkLogLevel infoJkMount /myTomcatPages/. worker1/codeOf course there can be many JkMount directives to redirect specific URL's to Tomcat according to your needs.5. Restart Apache6. End of part two:)This should now redirect any URL: http//your-apache-server/myTomcatPages/ to Tomcat.
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Of course don't forget to open connenctions on a 8009 port which tomcat uses to listen to ajp13 calls (defined in server.xml conf file of Tomcat).Hope it helps someone spend less time to make things work that it took me.Best regardsJaniP.S.: Anyone noticing a major 'hole' or mischief in my approach - please point it out! Thank you.:lol. For the most part I assume you are encouraged to use the modproxyajp module built into apache 2.2 so the modjk connect is not required. Which is the preferred way I connect tomcat and apache.I have come across a couple of times where I have resorted to using modjk so it is sometimes still a requirement.- Using a CA Siteminder plugin with Apache to provided Single Sign On to an application.
The CA Siteminder plugin was supported to work with modjk but not supported with modproxyajp.- I use it to talk to an applicaiton running on a jetty (not tomcat) java application server, this application server will supply packets above 8k which is larger than modproxyajp can use. Modjk will allow up to 64k packets.So it is still useful but only when you can't use modproxyajp for some reason.