Welcome!

Industrial IoT Authors: Liz McMillan, Elizabeth White, Pat Romanski, Scott Allen, William Schmarzo

Blog Feed Post

Configuring JBoss 7 with Apache

There are a number of articles out there about deploying applications to JBoss and about how to monitor JBoss, and in them the web application is usually accessed by pointing a browser to the web container running on port 8080. In enterprise production environments however, the application server does not exist in a vacuum – JBoss is usually fronted with the web server (most often Apache). This kind of setup brings about several benefits:

  • Improved security by limiting access to the app server. In an Internet application the web server is accessed directly by the clients. Separating the web server from the app server allows us to place the former in a Demilitarized Zone (DMZ), while the app server can live on a more protected corporate network. If the web server is compromised, there is an additional barrier for the hackers to overcome before they can get access to your precious application and database servers.
  • Improved security by limiting access to the application server. Some third-party plugins allow the web server to perform authentication against LDAP or RADIUS servers – unauthenticated/unauthorized requests do not even reach your application server.
  • Improved performance by caching static content. Apache can cache your static content (images, javascript and .css), while allowing the app server to concentrate on what it does best – business logic processing
  • Improved SSL performance. SSL performs on-the-fly encryption/decryption which can be computationally expensive. While JBoss can certainly handle it, it makes more sense to take the load off its shoulders and allow Apache to do the SSL heavy lifting (Apache can even use hardware SSL acceleration)
  • Last but not least, given the right setup, Apache can balance the load between your application servers very effectively (we will see how in a minute).

For simplicity, let’s assume the following:

  • we are running JBoss 7.1 in standalone mode
  • the operating system is CentOS 6.x
  • $JBOSS_HOME refers to the JBoss 7 installation directory (you don’t have to set this environment variable)
  • We will use the Monitis JMX agent web application to illustrate the process – the web application context is mon_jmx_agent

Configuring AJP

AJP stands for “Apache JServ Protocol” – this is the standard method of interfacing Apache with Tomcat (and later, JBoss) since the earliest versions of Tomcat. It is a packet-based protocol, which in it’s latest re-incarnation of 1.3 is very fast, while adding very little overhead. Tomcat (and by extension JBoss) speaks AJP out of the box. On the Apache side, the mod_proxy_ajp provides the necessary functionality. So let’s see how to put the whole thing together.

Step 1.Enable the AJP connector In JBoss 7 the AJP connector is not enabled by default, so let’s enable it. Open $JBOSS_HOME/standalone/configuration/standalone.xml, find the subsystem tag and add the AJP connector:

.....
        <subsystem xmlns="urn:jboss:domain:web:1.1" native="false" default-virtual-server="default-host">
...
            <connector name="ajp" protocol="AJP/1.3" scheme="http" socket-binding="ajp"/>
...
        </subsystem>
.....

Next, make sure that the ajp socket binding definition exists:

    <socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}">
        ....
        <socket-binding name="ajp" port="8009"/>
...

Step 2. Configure mod_proxy_ajp Go to /etc/httpd/conf.d and create a file proxy_ajp.conf as follows

<IfModule !proxy_ajp_module>
  LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
</IfModule>
ProxyPass /mon_jmx_agent ajp://localhost:8009/mon_jmx_agent

Step 3. Restart JBoss and Apache (in that order)
Now, open a web browser and navigate to http://localhost/mon_jmx_agent. You should see the JMX agent’s login screen.

Configuring mod_cluster

If you are running a cluster of multiple JBoss instances, you will need a load balancer to distribute the load between them. While both mod_proxy_ajp and mod_proxy_http do provide basic load-balancing functionality, it is somewhat limited. The most flexible way to implement load-balancing with apache nowadays is mod_cluster. Besides simply forwarding the requests to the cluster nodes, mod_cluster maintains a separate communication channel to the cluster nodes. This allows for more fine-grained load balancing based on a wider range of load-related parameters calculated by the cluster nodes. It also allows the cluster nodes to communicate lifecycle events to the mod_cluster load balancer, so that it can re-route the traffic accordingly. For instance, if you undeploy a WAR file on one of the cluster nodes, the load balancer will be aware of that and will route the requests to other nodes. Another important point is that mod_cluster supports dynamic discovery – the balancer does not need to be explicitly configured with the IP address/port numbers of the individual nodes.

Step 1. Configure yum for the EPEL repository (if not already enabled) Since mod_cluster is not yet part of the Apache distribution, we have to download separately from the EPEL repository, so let’s make sure yum is configured for this repository:

To check if EPEL is already configured in YUM, do

$rpm -qa epel-release

If the search results comes back blank, download the EPEL RPM from here (choose the appropriate version for the OS version you are running) and install it in order to configure yum for the EPEL repo:

$rpm -i epel-release-6-5.noarch.rpm

Step 2. Install mod_cluster and dependent modules

$yum install mod_cluster

Step 3: Configure mod_cluster

Step 3a. Open /etc/https/http.conf and make sure the following modules are enabled:

LoadModule proxy_module /modules/mod_proxy.so
LoadModule proxy_ajp_module /modules/mod_proxy_ajp.so
LoadModule slotmem_module /modules/mod_slotmem.so
LoadModule manager_module /modules/mod_manager.so
LoadModule proxy_cluster_module /modules/mod_proxy_cluster.so
LoadModule advertise_module /modules/mod_advertise.so

Step 3b. Create a file mod_cluster.conf in /etc/httpd/conf.d as follows:

<IfModule manager_module>
    Listen 192.168.1.100:6666   # change IP address to suit your environment
    ManagerBalancerName mycluster
    <VirtualHost 192.168.1.100:6666> # change IP address to suit your environment
        KeepAliveTimeout 300
        MaxKeepAliveRequests 0
        ServerAdvertise On
        AdvertiseGroup 224.0.1.105:23364
        AdvertiseSecurityKey secret # change key to match jboss config below

        <Location />
            Order deny,allow
      Deny from all
            Allow from 192.168.1. #change IP address filter to allow access from your local network
        </Location>
  </VirtualHost>
</IfModule>

Step 3c. Modify /etc/httpd/httpd.conf like so:

<VirtualHost *:80>
    ProxyPass / balancer://mycluster stickysession=JSESSIONID|jsessionid nofailover=On
    ProxyPassReverse / balancer://mycluster
    ProxyPreserveHost On

    <Location />
        Order deny,allow
        Allow from All
    </Location>

    <Location /mod_cluster_manager>
        SetHandler mod_cluster-manager
        Order deny,allow
        Deny from all
        Allow from 192.168.1. # change this to match your network setup
    </Location> 
</VirtualHost>

Step 3d: Modify the JBoss config file $JBOSS_HOME/standalone/configuration/standalone-ha.xml

<extensions>
...
    <extension module="org.jboss.as.modcluster"/>
...
</extensions>

<profile>
....
<subsystem xmlns="urn:jboss:domain:modcluster:1.0">
....
    <mod-cluster-config advertise-socket="modcluster" advertise-security-key="secret"/>
....
</profile>

<socket-binding-group name="standard-sockets" default-interface="public"
                       port-offset="${jboss.socket.binding.port-offset:0}">
...
    <socket-binding name="modcluster" port="0" multicast-address="224.0.1.105" multicast-port="23364"/>
...
</socket-binding-group>

Step 4. Start httpd

Step 5. Start JBoss with the standalone-ha.xml profile

That’s it. Open up a web browser and navigate to http://192.168.1.100/mod_cluster_manager and you should see the internal status page of the cluster manager:

The Contexts heading lists all application contexts (i.e. web applications) which are configures for this node. You should be able to open the Monitis JMX agent web application in a separate browser window: http://192.168.1.100/mon_jmx_agent (change the IP address as necessary).

Note: If the status page is blank, then the cluster nodes are not registering properly with the balancer. Make sure IP multicast is enabled between the web server and the app server machine (mod_cluster’s discovery functionality uses IP Multicast to advertise the balancer’s address and port to the cluster nodes). The usual culprits are SELinux and iptables, so you may have to create the appropriate rules. Alternatively, you can point JBoss 7 to the balancer explicitly instead of relying on autodiscovery. Replace the following line in the JBoss configuration file standalone-ha.conf:

<mod-cluster-config advertise-socket="modcluster" advertise-security-key="secret"/>

 

with one like this:

<mod-cluster-config proxy-list="192.168.1.100:6666"/>

For more information:

http://www.jboss.org/mod_cluster

http://docs.jboss.org/mod_cluster/1.1.0/html

http://oddthesis.org/posts/2008-12-jboss-and-mod_cluster/

 


Share Now:del.icio.usDiggFacebookLinkedInBlinkListDZoneGoogle BookmarksRedditStumbleUponTwitterRSS

Read the original blog entry...

More Stories By Hovhannes Avoyan

Hovhannes Avoyan is the CEO of PicsArt, Inc.,

@ThingsExpo Stories
When people aren’t talking about VMs and containers, they’re talking about serverless architecture. Serverless is about no maintenance. It means you are not worried about low-level infrastructural and operational details. An event-driven serverless platform is a great use case for IoT. In his session at @ThingsExpo, Animesh Singh, an STSM and Lead for IBM Cloud Platform and Infrastructure, will detail how to build a distributed serverless, polyglot, microservices framework using open source tec...
IoT offers a value of almost $4 trillion to the manufacturing industry through platforms that can improve margins, optimize operations & drive high performance work teams. By using IoT technologies as a foundation, manufacturing customers are integrating worker safety with manufacturing systems, driving deep collaboration and utilizing analytics to exponentially increased per-unit margins. However, as Benoit Lheureux, the VP for Research at Gartner points out, “IoT project implementers often ...
Basho Technologies has announced the latest release of Basho Riak TS, version 1.3. Riak TS is an enterprise-grade NoSQL database optimized for Internet of Things (IoT). The open source version enables developers to download the software for free and use it in production as well as make contributions to the code and develop applications around Riak TS. Enhancements to Riak TS make it quick, easy and cost-effective to spin up an instance to test new ideas and build IoT applications. In addition to...
Presidio has received the 2015 EMC Partner Services Quality Award from EMC Corporation for achieving outstanding service excellence and customer satisfaction as measured by the EMC Partner Services Quality (PSQ) program. Presidio was also honored as the 2015 EMC Americas Marketing Excellence Partner of the Year and 2015 Mid-Market East Partner of the Year. The EMC PSQ program is a project-specific survey program designed for partners with Service Partner designations to solicit customer feedbac...
Machine Learning helps make complex systems more efficient. By applying advanced Machine Learning techniques such as Cognitive Fingerprinting, wind project operators can utilize these tools to learn from collected data, detect regular patterns, and optimize their own operations. In his session at 18th Cloud Expo, Stuart Gillen, Director of Business Development at SparkCognition, discussed how research has demonstrated the value of Machine Learning in delivering next generation analytics to imp...
In his general session at 18th Cloud Expo, Lee Atchison, Principal Cloud Architect and Advocate at New Relic, discussed cloud as a ‘better data center’ and how it adds new capacity (faster) and improves application availability (redundancy). The cloud is a ‘Dynamic Tool for Dynamic Apps’ and resource allocation is an integral part of your application architecture, so use only the resources you need and allocate /de-allocate resources on the fly.
It is one thing to build single industrial IoT applications, but what will it take to build the Smart Cities and truly society changing applications of the future? The technology won’t be the problem, it will be the number of parties that need to work together and be aligned in their motivation to succeed. In his Day 2 Keynote at @ThingsExpo, Henrik Kenani Dahlgren, Portfolio Marketing Manager at Ericsson, discussed how to plan to cooperate, partner, and form lasting all-star teams to change t...
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, provided an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life sett...
There are several IoTs: the Industrial Internet, Consumer Wearables, Wearables and Healthcare, Supply Chains, and the movement toward Smart Grids, Cities, Regions, and Nations. There are competing communications standards every step of the way, a bewildering array of sensors and devices, and an entire world of competing data analytics platforms. To some this appears to be chaos. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, Bradley Holt, Developer Advocate a...
Connected devices and the industrial internet are growing exponentially every year with Cisco expecting 50 billion devices to be in operation by 2020. In this period of growth, location-based insights are becoming invaluable to many businesses as they adopt new connected technologies. Knowing when and where these devices connect from is critical for a number of scenarios in supply chain management, disaster management, emergency response, M2M, location marketing and more. In his session at @Th...
The cloud market growth today is largely in public clouds. While there is a lot of spend in IT departments in virtualization, these aren’t yet translating into a true “cloud” experience within the enterprise. What is stopping the growth of the “private cloud” market? In his general session at 18th Cloud Expo, Nara Rajagopalan, CEO of Accelerite, explored the challenges in deploying, managing, and getting adoption for a private cloud within an enterprise. What are the key differences between wh...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, wh...
Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is expected in the amount of information being processed, managed, analyzed, and acted upon by enterprise IT. This amazing is not part of some distant future - it is happening today. One report shows a 650% increase in enterprise data by 2020. Other estimates are even higher....
SYS-CON Events announced today that Bsquare has been named “Silver Sponsor” of SYS-CON's @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. For more than two decades, Bsquare has helped its customers extract business value from a broad array of physical assets by making them intelligent, connecting them, and using the data they generate to optimize business processes.
19th Cloud Expo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Meanwhile, 94% of enterpri...
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices - comp...
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportuni...
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo Silicon Valley Call for Papers is now open.
There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Big Data at Cloud Expo - to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA - has announced its Call for Papers is open. Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is...
Cognitive Computing is becoming the foundation for a new generation of solutions that have the potential to transform business. Unlike traditional approaches to building solutions, a cognitive computing approach allows the data to help determine the way applications are designed. This contrasts with conventional software development that begins with defining logic based on the current way a business operates. In her session at 18th Cloud Expo, Judith S. Hurwitz, President and CEO of Hurwitz & ...