<HTML ><HEAD ><TITLE >Configure Red Hat Linux</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Remote Serial Console HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Configure incidentals" HREF="misc.html"><LINK REL="PREVIOUS" TITLE="Configure Pluggable Authentication Modules" HREF="misc-pam.html"><LINK REL="NEXT" TITLE="Reboot and test" HREF="test.html"></HEAD ><BODY CLASS="SECTION" 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" >Remote Serial Console HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="misc-pam.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 7. Configure incidentals</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="test.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="MISC-CONFIGURE-RHL" ></A >7.7. Configure <SPAN CLASS="PRODUCTNAME" >Red Hat Linux</SPAN ></H1 ><P ><SPAN CLASS="PRODUCTNAME" >Red Hat Linux</SPAN > stores parameters concerning system start up in the file <TT CLASS="FILENAME" >/etc/sysconfig/init</TT >.</P ><P >Alter the parameter <TT CLASS="LITERAL" >BOOTUP</TT > to use terminal-independent commands to write the <TT CLASS="COMPUTEROUTPUT" >OK</TT >, <TT CLASS="COMPUTEROUTPUT" >PASSED</TT > and <TT CLASS="COMPUTEROUTPUT" >FAILED</TT > messages. These messages will no longer appear in green, yellow or red. The comments in <TT CLASS="FILENAME" >/etc/sysconfig/init</TT > suggest that any value other than <TT CLASS="LITERAL" >color</TT > will do, but it seems that <TT CLASS="LITERAL" >BOOTUP</TT > must be set to <TT CLASS="LITERAL" >serial</TT >.</P ><P >Alter the <TT CLASS="LITERAL" >PROMPT</TT > parameter to disallow interactive start up. Allowing an unauthenticated keystroke to stop system services is not robust against line noise and allows anyone that dials in during system boot to deny services.</P ><DIV CLASS="FIGURE" ><A NAME="MISC-CONFIGURE-RHL-ETC-SYSLINUX-INIT" ></A ><P ><B >Figure 7-14. Alterations to <TT CLASS="FILENAME" >/etc/sysconfig/init</TT > for <SPAN CLASS="PRODUCTNAME" >Red Hat Linux</SPAN ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >BOOTUP=serial PROMPT=no</PRE ></FONT ></TD ></TR ></TABLE ></DIV ><P ><SPAN CLASS="PRODUCTNAME" >Red Hat Linux</SPAN > runs a hardware discoverer, named <SPAN CLASS="APPLICATION" >kudzu</SPAN >. When attempting to identify a serial port <SPAN CLASS="APPLICATION" >Kudzu</SPAN > resets the serial port. This stops the serial console. <SPAN CLASS="APPLICATION" >Kudzu</SPAN > is configured from the file <TT CLASS="FILENAME" >/etc/sysconfig/kudzu</TT >.</P ><P ><SPAN CLASS="APPLICATION" >Kudzu</SPAN > can be prevented from resetting hardware by setting the configuration parameter <TT CLASS="LITERAL" >SAFE</TT > to <TT CLASS="LITERAL" >yes</TT >.</P ><DIV CLASS="FIGURE" ><A NAME="MISC-CONFIGURE-RHL-ETC-SYSLINUX-KUDZU" ></A ><P ><B >Figure 7-15. Alterations to <TT CLASS="FILENAME" >/etc/sysconfig/kudzu</TT > for <SPAN CLASS="PRODUCTNAME" >Red Hat Linux</SPAN ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >SAFE=yes</PRE ></FONT ></TD ></TR ></TABLE ></DIV ></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="misc-pam.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="test.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Configure Pluggable Authentication Modules</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="misc.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Reboot and test</TD ></TR ></TABLE ></DIV ></BODY ></HTML >