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Martin Langhoff 10c16b1cdf ejabberdctl: support concurrent connections with bound conn names
If flock is available, ejabberdctl will use it to grab one
of a bound number of connection names. This allows concurrent
connections while using a bound number of atoms.

Using PID, timestamps or random strings for transient connection IDs
(which would avoid the need for flock) uses an unbound number of atoms.
This can effectively DoS servers, as these connection names are
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README

ejabberd - High-Performance Enterprise Instant Messaging Server 

Quickstart guide


0. Requirements

To compile ejabberd you need:
 - GNU Make
 - GCC
 - Libexpat 1.95 or higher
 - Erlang/OTP R10B-9 or higher. The recommended version is R12B-5.
   Support for R13 is experimental.
 - OpenSSL 0.9.6 or higher, for STARTTLS, SASL and SSL
   encryption. Optional, highly recommended.
 - Zlib 1.2.3 or higher, for Stream Compression support
   (XEP-0138). Optional.
 - Erlang mysql library. Optional. MySQL authentication/storage.
 - Erlang pgsql library. Optional. PostgreSQL authentication/storage.
 - PAM library. Optional. For Pluggable Authentication Modules (PAM).
 - GNU Iconv 1.8 or higher, for the IRC Transport
   (mod_irc). Optional. Not needed on systems with GNU Libc.
 - ImageMagick's Convert program. Optional. For CAPTCHA challenges.
 - exmpp 0.9.2 or higher. Optional. For import/export XEP-0227 files. 


1. Compile and install on *nix systems

To compile ejabberd, go to the directory src/ and execute the commands:
  ./configure
  make

To install ejabberd, run this command with system administrator rights
(root user):

  sudo make install

These commands will:
 - Install the configuration files in /etc/ejabberd/
 - Install ejabberd binary, header and runtime files in /lib/ejabberd/
 - Install the administration script: /sbin/ejabberdctl
 - Install ejabberd documentation in /share/doc/ejabberd/
 - Create a spool directory: /var/lib/ejabberd/
 - Create a directory for log files: /var/log/ejabberd/


2. Start ejabberd

You can use the ejabberdctl command line administration script to
start and stop ejabberd. For example:
  ejabberdctl start


For detailed information please refer to the
ejabberd Installation and Operation Guide