<HTML ><HEAD ><TITLE >Using the Secondary Distributions</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="Development for Multiple Linux Distributions mini-HOWTO" HREF="index.html"><LINK REL="PREVIOUS" TITLE="Setup" HREF="setup.html"><LINK REL="NEXT" TITLE="Credits" HREF="credits.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Development for Multiple Linux Distributions mini-HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="setup.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="credits.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="USE">3. Using the Secondary Distributions</H1 ><P >With the secondary distributions installed, the steps to use them are: </P ><P ></P ><OL TYPE="1" ><LI ><P >It is important to use a 2.4-series or newer Linux kernel in the "primary" Linux distribution in order to take advantage of the multiple mount points feature that the 2.4-series permits. For many tasks, the <TT CLASS="FILENAME" >/proc</TT > and <TT CLASS="FILENAME" >/tmp</TT > filesystems will have to be remounted in the secondary distribution using: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >mount --bind /proc /opt/distros/redhat_6.2/proc mount --bind /tmp /opt/distros/redhat_6.2/tmp</PRE ></FONT ></TD ></TR ></TABLE > </P ></LI ><LI ><P >Also, it can be helpful to remount (rather than copy) the source tree from the primary to the secondary distro: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >mount --bind /home/USER/src/PROJECT /opt/distros/redhat_6.2/USER/src/PROJECT</PRE ></FONT ></TD ></TR ></TABLE > </P ></LI ><LI ><P >Become root and use: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >xhost +localhost chroot /opt/distros/redhat_6.2 /bin/bash</PRE ></FONT ></TD ></TR ></TABLE > to obtain a shell with one of the secondary distros. Note that the <TT CLASS="FILENAME" >xhost</TT > command is only necessary if you intend to use X-windows applications. </P ></LI ><LI ><P >Finally, create a user (if necessary) within the <TT CLASS="FILENAME" >chroot</TT >-ed shell and develop, build, and/or test your application within this "separate" Linux distribution! Not that you may also have to specify your <TT CLASS="FILENAME" >DISPLAY</TT > environment variable if you'd like to use X applications. </P ></LI ></OL ><P >Done! You now have a shell that is, for all practical purposes, running within the secondary Linux distribution of your choice. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="setup.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="credits.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Setup</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Credits</TD ></TR ></TABLE ></DIV ></BODY ></HTML >