This support solution is on installing a 32-bit app on an x64 system. Stated on the example of Java Development Kit installed on Fedora x64 bit.

Three layers are essential when it comes to 32/64bit compatibility:

– Processor

– Operating System

– Application

A 32 bit OS will run on a 32 or 64-bit processor, without any problems.

A 32-bit software on a 64 bit OS works but could cause difficulties even if the 64 bit systems are backward compatible with the 32-bit counterparts.

To run a 64 bit OS, you need support from its lower level (a 64-bit processor). Therefore a 64 bit OS does not work for a 32 bit CPU.

To run a 64-bit application, you need support from all lower levels (64 bit OS and 64-bit processor).

Linux commands:
Check your processor:

# cat /proc/cpuinfo

Check Kernel/System:

# uname -m

For our example, the perfect solution is to install a 64-bit version of JDK on the Fedora x64 bit operating system.

Here is the How-To-Do:

The first thing we need to do is get the JDK installer
JDK Home from Oracle.com

Once we have the installer in our local repository (as root):

chmod a+x  jdk-6u21-linux-x64-rpm.bin./jdk-6u21-linux-x64-rpm.bin

Next, we must add these two lines to the file: /etc/profile

JAVA_HOME=/usr/java/jdk1.6.0_21
pathmunge $JAVA_HOME/jre/bin after

At the end of the line that starts with export, we need to add this our JAVA_HOME variable, so the line should be like this:

export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HOME

Then, we need to execute the next statements. Hint: Copy all the lines as it were just one.

export JAVA_HOME=/usr/java/jdk1.6.0_21
export JAVA_ALTERNATIVE_PRIORITY=16021
/usr/sbin/update-alternatives --install /usr/bin/java java $JAVA_HOME/bin/java $JAVA_ALTERNATIVE_PRIORITY
/usr/sbin/update-alternatives --install /usr/bin/javadoc javadoc $JAVA_HOME/bin/javadoc $JAVA_ALTERNATIVE_PRIORITY
/usr/sbin/update-alternatives --install /usr/bin/appletviewer appletviewer $JAVA_HOME/bin/appletviewer $JAVA_ALTERNATIVE_PRIORITY
/usr/sbin/update-alternatives --install /usr/bin/javah javah $JAVA_HOME/bin/javah $JAVA_ALTERNATIVE_PRIORITY
/usr/sbin/update-alternatives --install /usr/bin/javac javac $JAVA_HOME/bin/javac $JAVA_ALTERNATIVE_PRIORITY
/usr/sbin/update-alternatives --install /usr/bin/jar jar $JAVA_HOME/bin/jar $JAVA_ALTERNATIVE_PRIORITY

Then, we export the alternatives:

/usr/sbin/update-alternatives --auto java
/usr/sbin/update-alternatives --auto javadoc
/usr/sbin/update-alternatives --auto appletviewer
/usr/sbin/update-alternatives --auto javah
/usr/sbin/update-alternatives --auto javac
/usr/sbin/update-alternatives --auto jar

To confirm that our installation is successful:

java -version

Should give us output like this:

[root@yourMachine]# java -version
java version "1.6.0_21"
Java(TM) SE Runtime Environment (build 1.6.0_21-b02)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)

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Further information:
http://www.techsupportalert.com/content/32-bit-and-64-bit-explained.htm

http://wporta.wordpress.com/2010/07/06/installing-jdk-in-fedora-13/

You can manage and create users with Webmin by:

System/Users and groups/Create a new user

More information:

http://doxfer.webmin.com/Webmin/WebminUsers

If you want to add new domains, for example:

[email protected]
[email protected]

You need to add those domains to

/etc/mail/local-host-names

then in

/etc/mail/virtusertable

enter

[email protected] john
[email protected] sally

john and sally are local users

and rebuild config with

make -C /etc/mail/

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More information:

http://www.linuxselfhelp.com/quick/sendmail.html

Managed system yum is software installation tool for Red Hat Linux and Fedora Linux. yum commands are typically run as.yum <command> <package name/s> By default, yum will automatically attempt to check all configured repositories to resolve all package dependencies during an installation/upgrade.

Here is a list of the most common and used yum commands:

yum list all

To list all packages that are available to use the commandyum.

yum install <package name/s>

Used to install the latest version of a package or group of packages. If no package matches the specified package name(s), they are assumed to be a shell glob, and any matches are then installed.

yum update <package name/s>

Used to update the specified packages to the latest available version. If no package name/s are specified, then yum will attempt to update all installed packages.

If the –obsoletes option is used (i.e. yum –obsoletes <package name/s>, yum will process obsolete packages. As such, packages that are obsoleted across updates will be removed and replaced accordingly.

yum check-update

This command allows you to determine whether any updates are available for your installed packages. yum returns a list of all package updates from all repositories if any are available.

yum remove <package name/s>

Used to remove specified packages, along with any other packages depend on the packages being removed.

yum provides <file name>

Used to determine which packages provide a specific file or feature.

yum search <keyword>

This command is used to find any packages containing the specified keyword in the description, summary, packager and package name fields of RPMs in all repositories.

yum localinstall <absolute path to package name/s>

Used when using yum to install a package located locally in the machine.

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More info under:

http://www.centos.org/docs/5/html/5.1/Deployment_Guide/s1-yum-useful-commands.html

http://yum.baseurl.org/wiki/YumCommands