source: BOOK/chroot/common/kernfs.xml@ a66f0df

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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;
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<sect1 id="ch-chroot-kernfs">
  <?dbhtml filename="kernfs.html"?>

  <title>Mounting Virtual Kernel File Systems</title>

  <para>From this point on, we will be running all commands as the
  <systemitem class="username">root</systemitem> user. So begin by
  exiting from the <command>su</command> as <systemitem
  class="username">lfs</systemitem>.</para>

<screen role="nodump"><userinput>exit</userinput></screen>

  <para>Various file systems exported by the kernel are used to communicate
  to and from the kernel itself. These file systems are virtual in that no
  disk space is used for them. The content of the file systems resides in
  memory.</para>

  <para>Begin by creating directories onto which the file systems will
  be mounted:</para>

<screen><userinput>mkdir -pv $LFS/{proc,sys}</userinput></screen>

  <para>Now mount the file systems:</para>

<screen><userinput>mount -vt proc proc $LFS/proc
mount -vt sysfs sysfs $LFS/sys</userinput></screen>

  <para>Remember that if for any reason you stop working on the LFS system
  and start again later, it is important to check that these file systems
  are mounted again before entering the chroot environment.</para>

  <para>Additional file systems will soon be mounted from within the
  chroot environment. To keep the host up to date, perform a <quote>fake
  mount</quote> for each of these now:</para>

<screen><userinput>mount -f -vt tmpfs tmpfs $LFS/dev
mount -f -vt tmpfs tmpfs $LFS/dev/shm
mount -f -vt devpts -o gid=10,mode=620 devpts $LFS/dev/pts</userinput></screen>

</sect1>