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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<chapter id="sys-req-prerequisites">
<title>System Requirements and Prerequisites</title>
<para>Using Enea NFV Access or compiling applications requires certain
packages to be installed on your NFV Access development host.</para>
<section id="enea-nfv-access-sysreq">
<title>System Requirements</title>
<para>The host requirements listed below are extensive to allow for the
building of Linux images via the Yocto system, and not just
applications.</para>
<para>Please also see the system requirements in the Yocto 2.1 documents:
Yocto Project Start <ulink
url="http://www.yoctoproject.org/docs/2.1/yocto-project-qs/yocto-project-qs.html#yp-resources">
http://www.yoctoproject.org/docs/2.1/yocto-project-qs/yocto-project-qs.html#yp-resources</ulink>
and the Yocto Project Reference Manual <ulink
url="http://www.yoctoproject.org/docs/2.1/ref-manual/ref-manual.html#intro-requirements">
http://www.yoctoproject.org/docs/2.1/ref-manual/ref-manual.html#intro-requirements</ulink>.
If needed, replace the Yocto version in the link(s) provided with a more
recent version.</para>
<informaltable>
<tgroup cols="2">
<colspec align="left" colname="1" colwidth="1*" />
<colspec align="left" colname="2" colwidth="3*" />
<spanspec nameend="2" namest="1" spanname="onetwo" />
<tbody>
<row>
<entry spanname="onetwo"><emphasis role="bold"> Build host
requirements<indexterm>
<primary>system requirements</primary>
</indexterm></emphasis></entry>
</row>
<row>
<entry>Linux distribution</entry>
<entry>The downloaded code shall be built on a Linux host to
generate images for your target or for emulation in QEMU. For
information about the supported hosts and targets, see the
<emphasis role="bold">Enea Linux Release Information</emphasis> in
your Enea Linux distribution.</entry>
</row>
<row>
<entry>Internet access</entry>
<entry>Internet access must be available when building an image,
since bitbake downloads source files from various servers during
the build.</entry>
</row>
<row>
<entry>Packages</entry>
<entry>Depending on the Linux distribution and version on host,
some packages may be required, by bitbake for example. You will
install any required packages while following the installation
instructions.</entry>
</row>
<row>
<entry>Targets</entry>
<entry>Images can be built or downloaded for any of the targets
supported in this release, as specified in the <emphasis
role="bold">Enea Linux Release Information</emphasis>.</entry>
</row>
<row>
<entry>Disk space</entry>
<entry><para>Your system should have at least 50 GB of free disk
space when bitbaking the basic enea-image-name kernel
image.</para> <para>For larger images and to allow for future
package extensions and variations in the build process, a minimum
of 100 GB free disk space is recommended.</para></entry>
</row>
<row>
<entry>Recommended RAM</entry>
<entry><para>Your system must have at least 4 GB available
RAM.</para> <para>It is recommended to have 8 GB RAM available for
parallel build jobs.</para></entry>
</row>
<row>
<entry>Java</entry>
<entry>Java <indexterm>
<primary>java</primary>
</indexterm>is required to run Eclipse. Currenly, Eclipse
generally recommends at least Java 6 JRE/JDK. More information
regarding operating environments for Eclipse, is provided in the
<emphasis>Eclipse Project Release Notes</emphasis> for the version
used. This can usually be found via
http://www.eclipse.org/eclipse/development/readme_eclipse_version.
See the <emphasis role="bold">Enea Linux Release Information
</emphasis>for the Eclipse Version.</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>The build time depends on the capacity of the processor and other
hardware, available resources, speed of internet connection, load
situation, etc. E.g: on a fast 16 core machine with 16 GB RAM and SSD
disks, a complete build from source could take about two hours.</para>
<informaltable>
<tgroup cols="2">
<colspec align="left" colname="1" colwidth="1*" />
<colspec align="left" colname="2" colwidth="3*" />
<spanspec nameend="2" namest="1" spanname="onetwo" />
<tbody>
<row>
<entry spanname="onetwo"><emphasis role="bold">Target
Requirements</emphasis></entry>
</row>
<row>
<entry>External memory</entry>
<entry>To boot a CGL<indexterm>
<primary>CGL</primary>
</indexterm> image, you need at least 16 GB on a hard-disk
drive<indexterm>
<primary>HDD</primary>
</indexterm> on eSATA, USB drive, or SD card.<remark>INFO:
(packed rootfs 4.5 GB + unpacked rootfs 1.5 GB + good
margins)</remark><remark>INFO: NFS does not support SELinux. In
order to have a security-enhanced Linux, one must take off from an
NFS-booted system and proceed with boot from external
memory.</remark></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</section>
<section id="ensure-bash">
<title>System Shell Configuration</title>
<para>Before installing Enea Linux, ensure that bash is the default
shell.</para>
<para>If your system runs Ubuntu, you can use ls -l to ensure
<filename>/usr/bin</filename> is a symbolic link to bash. In case the link
points to dash, which is default in some Ubuntu versions, change it to
bash by running <emphasis role="bold">sudo dpkg-reconfigure
dash</emphasis> and answer <emphasis role="bold">No</emphasis> to the
question "Use dash as the default system shell (/bin/sh)?":</para>
<programlisting># ls -l /bin/sh
lrwxrwxrwx 1 root root 4 2012-03-02 11:53 /bin/sh -> bash</programlisting>
</section>
<section id="preq-packages">
<title>Prerequisite Packages</title>
<para>First ensure the system is up-to-date, then for the supported
distribution(s), you need the following packages:<remark>INFO: The
programlisting below is a parameters in eltf_params_updated.xml with ID:
"eltf-prereq-apt-get-command-host". If multiple hosts are supported, store
the commands for each host in the same programlisting with empty lines
between each - the comment with the FULL HOST name and version is
essential.</remark></para>
<xi:include href="eltf_params_updated.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(eltf-prereq-apt-get-commands-host/1)" />
</section>
</chapter>
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