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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3232 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
56 lines
2.7 KiB
XML
56 lines
2.7 KiB
XML
<sect1 id="ch-system-proc">
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<title>Mounting the proc and devpts file systems</title>
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<?dbhtml filename="proc.html" dir="chapter06"?>
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<para>In order for certain programs to function properly, the
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<emphasis>proc</emphasis> and <emphasis>devpts</emphasis> file systems must be
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available within the chroot environment. The proc file system is the process
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information pseudo file system through which the kernel provides information
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about the status of the system. And the devpts file system is nowadays the most
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common way pseudo terminals (PTYs) are implemented. Since kernel version 2.4, a
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file system can be mounted as many times and in as many places as you like,
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thus it's not a problem that these file systems are already mounted on your
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host system, especially so because they are virtual file systems.</para>
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<para>First become <emphasis>root</emphasis>, as only <emphasis>root</emphasis>
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can mount file systems in unusual places. Then check again that the LFS
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environment variable is set correctly by running <userinput>echo
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$LFS</userinput> and making sure it shows the path to your LFS partition's
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mount point, which is <filename class="directory">/mnt/lfs</filename> if you
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followed our example.</para>
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<para>Now make the mount points for these filesystems:</para>
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<screen><userinput>mkdir -p $LFS/{proc,dev/pts}</userinput></screen>
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<para>Mount the <emphasis>proc</emphasis> file system with:</para>
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<screen><userinput>mount proc $LFS/proc -t proc</userinput></screen>
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<para>And mount the <emphasis>devpts</emphasis> file system with:</para>
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<screen><userinput>mount devpts $LFS/dev/pts -t devpts</userinput></screen>
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<para>This last command might fail with an error like:</para>
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<blockquote><screen>filesystem devpts not supported by kernel</screen></blockquote>
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<para>The most likely cause for this is that your host system's kernel was
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compiled without support for the devpts file system. You can check which file
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systems your kernel supports by peeking into its internals with
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<command>cat /proc/filesystems</command>. If a file system type named
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<emphasis>devfs</emphasis> is listed there, then we'll be able to work around
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the problem by mounting the host's devfs file system on top of the new
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<filename>/dev</filename> structure which we'll create later on in the section
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on <xref linkend="ch-system-MAKEDEV"/>. If devfs was not listed, do not worry
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because there is yet a third way to get PTYs working inside the chroot
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environment. We'll cover this shortly in the aforementioned
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<xref linkend="ch-system-MAKEDEV"/> section.</para>
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<para>Remember that if for any reason you stop working on your LFS, and start
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again later, it's important to check that these file systems are mounted again
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before entering the chroot environment, otherwise problems could occur.</para>
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</sect1>
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