274 lines
4.5 KiB
HTML
274 lines
4.5 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Extending the solution</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="HOWTO Clone Disk Images on Linux Booted from a Network"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Running the clone script"
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HREF="running.html"><LINK
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REL="NEXT"
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TITLE="List of files on initrd"
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HREF="initrdfiles.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>HOWTO Clone Disk Images on Linux Booted from a Network</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="running.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="initrdfiles.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="EXTENDING">7. Extending the solution</H1
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN305">7.1. Saving and restoring files instead of file systems</H2
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><P
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>If you don't want to save a whole disk image just the files within the file system, you can use a similar solution but with <B
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CLASS="COMMAND"
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>tar</B
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> or <B
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CLASS="COMMAND"
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>cpio</B
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> instead of <B
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CLASS="COMMAND"
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>dd</B
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>. Also you need to mount the file system. More commands should be added to the clone script as shown below.</P
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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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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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><TT
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CLASS="PROMPT"
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># </TT
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>mkdir /mnt
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<TT
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CLASS="PROMPT"
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># </TT
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>mount ${device_name} /mnt
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<TT
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CLASS="PROMPT"
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># </TT
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>mknod ${image} p
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<TT
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CLASS="PROMPT"
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># </TT
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>tftp ${tftp_server} <<-EOT &
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binary
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put ${image}
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EOT
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tar czf ${image}
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>or</P
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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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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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><TT
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CLASS="PROMPT"
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># </TT
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>tftp ${tftp_server} <<-EOT &
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binary
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get ${image}
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EOT
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tar xzf ${image}
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>You have to put the <B
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CLASS="COMMAND"
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>mkdir</B
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> and <B
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CLASS="COMMAND"
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>tar</B
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> programs in the initrd image so that the script can use them.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN322">7.2. Setting up the master boot record</H2
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><P
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>In a situation where you used this setup to reorganize and resize your partitions, you may end up with a disk that doesn't boot. Running the <B
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CLASS="COMMAND"
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>setup</B
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> command from Grub (including the <B
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CLASS="COMMAND"
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>grub</B
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> program in the image) should resolve the situation. See the Grub documentation for details.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN327">7.3. Loading necessary modules</H2
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><P
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>Depending on your kernel, additional modules may be necessary to access some block devices like SCSI devices. Just put the necessary modules in the <TT
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CLASS="FILENAME"
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>/lib</TT
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> directory of the initrd image and the correspondent <B
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CLASS="COMMAND"
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>insmod</B
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> commands in the clone script. The same applies for file systems. If, for instance, you want save the files instead of the image of a <EM
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>fat</EM
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> file system you will need the <TT
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CLASS="FILENAME"
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>fat.o</TT
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> and <TT
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CLASS="FILENAME"
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>vfat.o</TT
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> modules.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN335">7.4. Predefined operations on <TT
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CLASS="FILENAME"
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>grub.conf</TT
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></H2
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><P
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>The Grub menu file <TT
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CLASS="FILENAME"
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>grub.conf</TT
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> may be customized to present a few copy options or even execute a predefined operation such as repartitioning the disk and retrieving specified images from network. Again, you can use the concepts presented here to achieve a specific application.</P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="running.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
|
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="initrdfiles.html"
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ACCESSKEY="N"
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>Next</A
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></TD
|
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></TR
|
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><TR
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
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>Running the clone script</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
|
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VALIGN="top"
|
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> </TD
|
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><TD
|
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WIDTH="33%"
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ALIGN="right"
|
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VALIGN="top"
|
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>List of files on initrd</TD
|
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></TR
|
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></TABLE
|
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></DIV
|
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></BODY
|
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></HTML
|
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> |