Clusters in an application server enhance scalability and availability, which are
related concepts. In order to achieve the benefits of clustering, you need to manage
the configuration of several components like the clustering transport at first, the
replication/distribution of data across cluster members and the techniques used to
balance load between nodes.
The backbone of WildFly clustering is the JGroups library,
which provides a reliable multicast system used by cluster members to find each
other and communicate.
Next comes Infinispan, which is a data grid platform that is used by the application
server to keep in sync the application data in the cluster by means of a replicated
and transactional JSR-107 compatible cache.
Recommended Tutorials available:
Clustering WildFly Application Server
Configuring High Availability with WildFly
Configuring WildFly as Load Balancer for a Cluster
How to cluster a Web Application
EJB to EJB communication in a cluster
How to configure HTTP Session in a cluster
How to calculate the size of the HTTP Session
How to monitor and invalidate HTTP Sessions
Configuring Ranked Load Balancing
Configuring Load Balancing Groups
How to change multicast address of a Cluster
How to configure a Cluster to use TCPPING
Configuring mod_jk with WildFly
Dispatching commands on a WildFly cluster
Monitoring a cluster using WildFly API
Mod cluster is an http based load balancer which greatly simplify the setup of an http cluster. It ships as a set of modules which need to be installed on the httpd server and a Service Archive Library (.sar) which needs to be deployed on WildFly. Wildfly is also able to handle front-end requests with … Read more
In this tutorial we will learn how to configure nginx -the popular load balancing solution- in front of a cluster of WildFly or JBoss servers. Nginx is a powerful opensource balancing solution which offers many benefits in terms of load balancing, server health checks, HTTP/2 support, active monitoring and more. Let’s start from the installation. … Read more
By using Buddy replication, sessions are replicated to a configurable number of backup servers in the cluster (also called buddies), rather than to all servers in the cluster. If a user fails over from the server that is hosting his or her session, the session data is transferred to the new server from one of … Read more
What you like to have a close look over the Infinispan distribution of data in your JBoss EAP 6 / WildFly cluster? I’ll tell you how to do it. The default algorithm used by WildFly application server for clustering is based on the Infinispan distribution. This means that cache entries are copied to a fixed … Read more
This tutorial covers an advanced clustering scenario where you have an EJB client on a JBoss AS 7/WildFly server that is communicating with another EJB that is running on a cluster of servers. The purpose of this trail is to demonstrate that the EJB client can get a view of the cluster topology on first … Read more
One of the main advantages of using clustered Session Beans is that load can be spread across several cluster members. This by default happens on a random basis. Today we will learn how to customize the Session bean load balancing in WildFly or JBoss EAP 6. By default, calls from a client to a cluster … Read more
This tutorial has been updated, thanks to the suggestions received on developer.jboss.org. We thank our readers for reporting any issue found in our tutorials. This is the second article about WildFly clustering API. You can read here the first tutorial: Monitoring a cluster using WildFly API. In this article we will learn how to execute commands … Read more
WildFly 8 introduces a new API which can be used to gather information about the WildFly cluster topology and receive notifications when new nodes leave or join the cluster. The org.wildfly.clustering.group.Group interface can be used for this purpose: The Group service provides a mechanism to view the cluster topology and to be notified when … Read more
So you are trying to come to grips with mod_cluster and JBoss/WildFly but your clustering still doesn’t work? in this article I’ll discuss about troubleshooting some common issues. Mod_cluster Advice #1 The first thing you need obviously to check is that you are running a version of mod_cluster which is compatible with your machine and … Read more
This tutorial contains an excerpt of the upcoming WilfFly Book which shows how to create a load balancing configuration for WildFly 8 using the older Apache Tomcat mod_jk. Although the recommended load balancing solution for clustering JBoss AS7/Wildfly is mod_cluster you should include in your administrator’s skill also the earlier Apache Tomcat mod_jk connector in some scenarios. Configuring … Read more
