source: BOOK/chroot/common/kernfs.xml @ fb40919

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since fb40919 was fb40919, checked in by Chris Staub <chris@…>, 13 years ago

Changed many 'LFS' references to 'CLFS'

  • Property mode set to 100644
File size: 2.4 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-chroot-kernfs">
9  <?dbhtml filename="kernfs.html"?>
10
11  <title>Mounting Virtual Kernel File Systems</title>
12
13    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
14    href="../../boot/common/devices.xml"
15    xpointer="xpointer(//*[@os='a'])"/>
16
17  <para>Various file systems exported by the kernel are used to communicate
18  to and from the kernel itself. These file systems are virtual in that no
19  disk space is used for them. The content of the file systems resides in
20  memory.</para>
21
22  <para>Begin by creating directories onto which the file systems will
23  be mounted:</para>
24
25<screen><userinput>mkdir -pv $LFS/{dev,proc,sys}</userinput></screen>
26
27  <para>Now mount the file systems:</para>
28
29<screen><userinput>mount -vt proc proc $LFS/proc
30mount -vt sysfs sysfs $LFS/sys</userinput></screen>
31
32  <para>Remember that if for any reason you stop working on the CLFS system
33  and start again later, it is important to check that these file systems
34  are mounted again before entering the chroot environment.</para>
35
36  <para>Two device nodes, /dev/console and /dev/null, are required to be
37  present on the filesystem.  These are needed by the kernel even before
38  starting Udev early in the boot process, so we create them here:</para>
39
40<screen><userinput>mknod -m 600 $LFS/dev/console c 5 1
41mknod -m 666 $LFS/dev/null c 1 3</userinput></screen>
42
43  <para>Once the system is complete and booting, the rest of our device
44  nodes are created by the Udev package.  Since this package is not
45  available to us right now, we must take other steps to provide device
46  nodes under on the CLFS filesystem.  We will use the <quote>bind</quote>
47  option in the mount command to make our host system's /dev structure
48  appear in the new CLFS filesystem:</para>
49
50<screen><userinput>/tools/bin/mount -o bind /dev $LFS/dev</userinput></screen>
51
52  <para>Additional file systems will soon be mounted from within the chroot
53  environment. To keep the host up to date, perform a <quote>fake mount</quote>
54  for each of these now:</para>
55
56<screen><userinput>mount -f -vt tmpfs tmpfs $LFS/dev/shm
57mount -f -vt devpts -o gid=10,mode=620 devpts $LFS/dev/pts</userinput></screen>
58
59</sect1>
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