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The Internet Communications Engine
Ice is a modern alternative to object middleware such as CORBA or
COM/DCOM/COM+. It is easy to learn, yet provides a powerful network
infrastructure for demanding technical applications. It features an
object-oriented specification language, easy to use C++, C#, Java,
Python, Ruby, PHP, and Visual Basic mappings, a highly efficient
protocol, asynchronous method invocation and dispatch, dynamic
transport plug-ins, TCP/IP and UDP/IP support, SSL-based security, a
firewall solution, and much more.
Ice is available under the terms of the GNU General Public License
(GPL) (see LICENSE file). Commercial licenses are available for
customers who wish to use Ice with proprietary products. Please
contact for more information about licensing Ice.
About this distribution
This distribution is an RPM release of the Ice 3.3.1 run time for
Fedora and includes executables for the Ice services, HTML
documentation, Slice files, and the C++ runtime libraries. It has been
modified from the RPM distribution provided through to meet Fedora packaging standards.
Additional Ice components are provided in separate RPM packages:
- Run time libraries for Java, Python, PHP, Ruby and C# (Mono). These
libraries enable you to execute Ice applications. (ice-java,
ice-python, ice-php, ice-ruby, ice-csharp)
- Development kits for C++, Java, Python, Ruby, and C# (Mono). A
development kit is required for building Ice applications using a
supported language mapping. (ice-devel, ice-java-devel,
ice-python-devel, ice-ruby-devel, ice-csharp-devel)
- Sample /etc/init.d scripts. (ice-servers)
- The graphical IceGrid administrative tool. (icegrid-gui)
These RPMS can all also be installed through yum.
Setting up your environment to use Ice
No additional compiler or linker options are required for an RPM
installation of the Ice for C++ development kit.
To use Ice for Java with Java5 or Java6, add Ice.jar to your CLASSPATH,
as shown in the following bash command:
$ export CLASSPATH=`build-classpath Ice`:$CLASSPATH
Note that the Freeze component of Ice for Java requires Berkeley DB.
In order to use Freeze, you must add db.jar to your CLASSPATH. In
addition, the JVM requires the directory containing the Berkeley DB
libraries to be listed in java.library.path, therefore you must add
this directory to your LD_LIBRARY_PATH. Assuming you are using the RPM
installation of Berkeley DB, the bash command is shown below:
On a x86_64 system with a 64-bit JVM, the 64-bit Berkeley DB libraries
are installed in /usr/lib64, so use instead:
$ export LD_LIBRARY_PATH=/usr/lib64:$LD_LIBRARY_PATH
When using the Ice for Java SSL plugin (IceSSL), you may experience
occasional hangs. The most likely reason is that your system's entropy
pool is empty. If you have sufficient system privileges, you can solve
this issue by editing the following file
and changing it to use /dev/urandom instead of /dev/random. If you do
not have permission to modify the security file, you can also use the
command-line option shown below:
$ java MyClass ...
On SuSE Linux Enterprise Server, you may experience occasional hangs
the first time an Ice object adapter is activated within a JVM. A
work-around is to disable IPv6 support by setting the Java property to true. For example:
$ java MyClass ...
For more information on this issue, refer to Sun's bug database:
The RPM installation puts the Python libraries into the correct
sitelib directories; there is no need for any additional configuration
to use them.
The RPM installation adds the C# runtime libraries to the global
assembly cache (GAC), so that no changes to your environment are
necessary to locate the assemblies.
The instructions for running the demos assume that you have configured
your kernel to automatically execute the Mono interpreter. To do this,
run the following commands as root (replace /usr/bin/mono with the
location of your mono interpreter):
if [ ! -e /proc/sys/fs/binfmt_misc/register ]; then
/sbin/modprobe binfmt_misc
mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
if [ -e /proc/sys/fs/binfmt_misc/register ]; then
echo ':CLR:M::MZ::/usr/bin/mono:' > /proc/sys/fs/binfmt_misc/register
echo "No binfmt_misc support" exit 1
If you don't want to do this you need to run the executable with
mono. For example,
$ mono server.exe
The RPM installation puts the Ruby libraries into the correct
sitelib directories; there is no need for any additional configuration
to use them.
The Ice extension for PHP is loaded automatically when the interpreter
loads the contents of the file /etc/php.d/ice.ini.
You can modify this file to include additional configuration
directives, such as those used by the Ice extension.
At run time, the PHP interpreter requires the Ice shared libraries as
well as the Slice preprocessor (icecpp).
You can verify that the Ice extension is installed properly by
examining the output of the "php -m" command, or by calling the
phpinfo() function from a script.
SELinux Notes
SELinux augments the traditional Unix permissions with a number of
new features. In particular, SELinux can prevent the httpd daemon from
opening network connections and reading files without the proper
SELinux types.
If you suspect that your IcePHP application does not work due to
SELinux restrictions, we recommend that you first try it with SELinux
disabled. As root, run:
# setenforce 0
to disable SELinux until the next reboot of your computer.
If you want to run httpd with IcePHP and SELinux enabled, you must do
the following:
- Allow httpd to open network connections:
# setsebool httpd_can_network_connect=1
(add the -P option to make this setting persistent across reboots)
- Make sure any .ice file used by your PHP scripts can be read by
httpd. The enclosing directory also needs to be accessible. For
# chcon -R -t httpd_sys_content_t /opt/MyApp/slice
For more information on SELinux, refer to the link below:
/etc/init.d scripts
The ice-servers includes the following sample /etc/init.d scripts and
associated configuration files:
- /etc/init.d/icegridregistry and /etc/icegridregistry.conf
- /etc/init.d/icegridnode and /etc/icegridnode.conf
- /etc/init.d/glacier2router and /etc/glacier2router.conf
This RPM also creates an "iceuser" account to run the services.
None of these services are enabled during the RPM installation; you
need to manually enable the desired service(s) using the chkconfig
command, for example:
# chkconfig --add icegridregistry
Before doing so, please review the script itself and its associated
configuration file. For icegridregistry and icegridnode, you also need
to create 'data' directories with the proper permissions (refer to the
.conf files).
Using the IceGrid Administrative Console
The Java-based graphical tool for administering IceGrid applications
can be run as follows:
$ icegridgui
Full documentation of this tool is at the following URL:
Demos and documentation
Sample programs are provided in the Ice-3.3.1-demos.tar.gz package,
which can be downloaded from the ZeroC web site at
Please refer to the README.DEMOS file included in that package for
more information.
See doc/README.html for information on the documentation included with
this distribution.
Binary compatibility
Patch releases of Ice are binary compatible. For example, version
<x>.<y>.1 is compatible with <x>.<y>.0, so you can run applications
compiled with <x>.<y>.0 with the <x>.<y>.1 runtime without having to
With the binary installers, simply uninstall the previous version of
Ice and install the new one. Already deployed applications that were
compiled against the <x>.<y>.0 runtime will automatically use the
<x>.<y>.1 runtime.
Note: Under Mono, binary compatibility currently does not work due to
issues with Mono. Until this problem in Mono is fixed, you
cannot run applications compiled with previous minor versions of
Ice against a newer version of the Ice assemblies. For example,
an application compiled with version <x>.<y>.0 of Ice cannot run
with the <x>.<y>.1 Ice assemblies.
[ This file was modified by Mary Ellen Foster from the original
README.Linux-RPM distributed by ZeroC. ]
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