485 lines
8.8 KiB
HTML
485 lines
8.8 KiB
HTML
<HTML
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><HEAD
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>Delete programs, Edit files pertaining to modules</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.60"><LINK
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>Securing and Optimizing Linux: RedHat Edition -A Hands on Guide</TH
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>Prev</A
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><TD
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WIDTH="80%"
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ALIGN="center"
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>Chapter 7. Configuring and Building a Secure, Optimized Kernel</TD
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><TD
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WIDTH="10%"
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ALIGN="LEFT"
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CLASS="section"
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><H1
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CLASS="section"
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><A
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NAME="AEN5761"
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>7.11. Delete programs, Edit files pertaining to modules</A
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></H1
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><P
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> By default when you install Red Hat Linux for the first time like we do, the kernel is built as a modularized kernel. This means that each device or function we need exists as modules and is controlled by
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the Kernel Daemon program named kmod, which automatically loads some modules and functions support into memory as it is needed, and unloads it when it's no longer being used.
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</P
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><DIV
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CLASS="procedure"
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><OL
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TYPE="1"
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><LI
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><P
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> kmod and other module management programs included in the modutils <SPAN
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CLASS="acronym"
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>RPM</SPAN
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> package use the <TT
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CLASS="filename"
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>conf.modules</TT
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> file located in the <TT
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CLASS="filename"
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>/etc</TT
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> directory to know, for example which Ethernet card you
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have, if your Ethernet card requires special configuration and so on. Since we are not using any modules in our new compiled kernel, we can remove the <TT
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CLASS="filename"
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>conf.modules</TT
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> file and uninstall completely the
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modutils package program.
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To remove the <TT
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CLASS="filename"
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>conf.modules</TT
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> file, use the command:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> [root@deep] /#<B
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CLASS="command"
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>rm</B
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> -f /etc/conf.modules
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</PRE
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></TD
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></TR
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></TABLE
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>
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To uninstall the modutils package, use the following command:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> [root@deep] /#<B
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CLASS="command"
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>rpm</B
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> -e --nodeps modutils
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</PRE
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></TD
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></TR
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></TABLE
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>
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</P
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></LI
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><LI
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><P
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>
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One last thing to do is to edit the file <TT
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CLASS="filename"
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>rc.sysinit</TT
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> and comment out all the lines related to <B
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CLASS="command"
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>depmod</B
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> -a by inserting a <TT
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CLASS="prompt"
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>#</TT
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> at
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the beginning of the lines. This is needed since at boot time the system read the <TT
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CLASS="filename"
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>rc.sysinit</TT
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> script to find module dependencies in the kernel by default.
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<DIV
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CLASS="mediaobject"
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><P
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><IMG
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SRC="images/Version6.2.gif"
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ALT="Version 6.2 only"
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></IMG
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></P
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></DIV
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>
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Comment out the line 260 in the <TT
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CLASS="filename"
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>rc.sysinit</TT
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> file vi +260 <TT
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CLASS="filename"
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>/etc/rc.d/rc.sysinit</TT
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>:
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<TT
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CLASS="userinput"
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><B
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> if [ -x /sbin/depmod -a -n "$USEMODULES" ]; then</B
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></TT
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>,
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To read:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> #if [ -x /sbin/depmod -a -n "$USEMODULES" ]; then
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</PRE
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></TD
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></TR
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></TABLE
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>
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Comment out the lines 272 to 277 in the <TT
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CLASS="filename"
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>rc.sysinit</TT
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> file vi +272 <TT
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CLASS="filename"
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>/etc/rc.d/rc.sysinit</TT
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>:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> if [ -L /lib/modules/default ]; then
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INITLOG_ARGS= action "Finding module dependencies" depmod -a default
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else
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INITLOG_ARGS= action "Finding module dependencies" depmod -a
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fi
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fi
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</PRE
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></TD
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></TR
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></TABLE
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>
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> To read:
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# if [ -L /lib/modules/default ]; then
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# INITLOG_ARGS= action "Finding module dependencies" depmod -a default
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# else
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# INITLOG_ARGS= action "Finding module dependencies" depmod -a
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# fi
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#fi
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</PRE
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></TD
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></TR
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></TABLE
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>
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<DIV
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CLASS="important"
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><BLOCKQUOTE
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CLASS="important"
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><P
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><B
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><SPAN
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CLASS="inlinemediaobject"
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><IMG
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SRC="./images/Important.gif"
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ALT="Important"
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></IMG
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></SPAN
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>: </B
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>
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The procedure described above relates to initscripts-4_70-1 package under Red Hat Linux version 6.1.
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</P
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></BLOCKQUOTE
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></DIV
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>
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<DIV
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CLASS="mediaobject"
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><P
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><IMG
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SRC="images/Version6.2.gif"
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ALT="Version 6.2 only"
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></IMG
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></P
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></DIV
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>
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Comment out the line 243 in the <TT
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CLASS="filename"
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>rc.sysinit</TT
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> file vi +243 <TT
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CLASS="filename"
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>/etc/rc.d/rc.sysinit</TT
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>:
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<TT
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CLASS="userinput"
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><B
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>if [ -x /sbin/depmod -a -n "$USEMODULES" ]; then</B
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></TT
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>,
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To read:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> #if [ -x /sbin/depmod -a -n "$USEMODULES" ]; then
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</PRE
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></TD
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></TR
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></TABLE
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>
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Comment out the lines 255 to 260 in the <TT
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CLASS="filename"
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>rc.sysinit</TT
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> file vi +255 <TT
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CLASS="filename"
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>/etc/rc.d/rc.sysinit</TT
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>:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> if [ -L /lib/modules/default ]; then
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INITLOG_ARGS= action "Finding module dependencies" depmod -a default
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else
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INITLOG_ARGS= action "Finding module dependencies" depmod -a
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fi
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fi
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</PRE
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></TD
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></TR
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></TABLE
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>
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To read:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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>
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# if [ -L /lib/modules/default ]; then
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# INITLOG_ARGS= action "Finding module dependencies" depmod -a default
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# else
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# INITLOG_ARGS= action "Finding module dependencies" depmod -a
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# fi
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#fi
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</PRE
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></TD
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></TR
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></TABLE
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>
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Once again, all of this part Delete program, file and lines related to modules is required only if you said No to <TT
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CLASS="userinput"
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><B
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>Enable loadable</B
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></TT
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> module support <TT
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CLASS="envar"
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>CONFIG_MODULES</TT
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> in your kernel configuration above.
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</P
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></LI
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><LI
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><P
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>
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Now you must Reboot your system and test your results.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> [root@deep] /#<B
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CLASS="command"
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>reboot</B
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>
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</PRE
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></TD
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></TR
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></TABLE
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>
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When the system is rebooted and you are logged in, verify the new version of your kernel with the following command:
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To verify the version of your new kernel, use the following command:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="screen"
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> [root@deep] /#<B
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CLASS="command"
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>uname</B
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> -a
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</PRE
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></TD
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></TR
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></TABLE
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>
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<P
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CLASS="literallayout"
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><br>
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<TT
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CLASS="computeroutput"
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> Linux deep.openna.com 2.2.14 #1 Mon Jan 10 10:40:35 EDT 2000 i686 unknown
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[root@deep]#
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</TT
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><br>
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</P
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>
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</P
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></LI
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></OL
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></DIV
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><P
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> <EM
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> Congratulation !.
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</EM
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>
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</P
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></DIV
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="chap7sec85.html"
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>Prev</A
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></TD
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ALIGN="center"
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VALIGN="top"
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HREF="index.html"
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>Home</A
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ALIGN="right"
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HREF="chap7sec87.html"
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>Next</A
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><TD
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WIDTH="33%"
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>Installing the new kernel</TD
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ALIGN="center"
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>Create a emergency Rescue and Boot floppy disk</TD
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