For instance, to federate with Google’s “GTalk” XMPP network, server administrators need to have server-to-server (s2s) SSL/TLS encryption enabled, while other servers don’t always require this. In the XMPP system there is no single point of failure, however each server administrator can decide how their server is going to participate in the federated network. Without a centralized server, every XMPP server maintains the accounts and serves as the communication gateway for their own users. Users with accounts on one server–if the server administrators allow it–can communicate with users on other servers. resources), the resource adds a useful amount of specificity. the resource is optional although XMPP allows a single JID to be connected to the server from multiple machines (i.e. In following example, “username” is the username, “” is the hostname, and “/office” is the resource.

The resource is optional, and is often safely omitted or ignored for most users. It often looks like an email address and contains the username that identifies a specific user on a server, the hostname that identifies the server, and a resource that identifies where a given user is logged in from. The JID or “Jabber ID” is the unique identifier for a user in the XMPP network. Though you can successfully run an XMPP server with only a passing familiarity of the way the XMPP network and system works, understanding the following basic concepts will be helpful: Once you’ve completed these requirements we can begin with the installation process. This installation process assumes that you have a working installation of Debian 5 (Lenny), that you’ve followed the steps in the Setting Up and Securing a Compute Instance guide, and that you are connected to your Linode via SSH as the root user. It even includes support for hosting multiple domains virtually. Although ejabberd is considered “heavyweight” by some, mostly due to the requirements of the Erlang runtimes, it is incredibly robust and can scale to support heavy loads. With a web-based interface and broad support for XMPP standards, ejabberd is an ideal general-use and multi-purpose XMPP server.

Ejabberd, the “Erlang Jabber Daemon,” is an extensible, flexible and very high performance XMPP server written in the Erlang programming language.

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