source: BOOK/chroot/common/devices.xml @ 94e6142

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since 94e6142 was 94e6142, checked in by Jim Gifford <clfs@…>, 18 years ago

r1167@server (orig r1165): chris | 2006-02-11 08:13:02 -0800
Added -v to commands in the rest of the book

  • Property mode set to 100644
File size: 3.3 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-devices">
9  <?dbhtml filename="devices.html"?>
10
11  <title>Populating /dev</title>
12
13  <indexterm zone="ch-chroot-devices">
14    <primary sortas="e-/dev/*">/dev/*</primary>
15  </indexterm>
16
17  <sect2>
18    <title>Creating Initial Device Nodes</title>
19
20    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
21    href="../../boot/common/devices.xml"
22    xpointer="xpointer(//*[@os='b'])"/>
23
24<screen><userinput>mknod -m 600 /dev/console c 5 1
25mknod -m 666 /dev/null c 1 3</userinput></screen>
26
27  </sect2>
28
29  <sect2>
30    <title>Mounting tmpfs and Populating /dev</title>
31
32    <para>The recommended method of populating the <filename
33    class="directory">/dev</filename> directory with devices is to
34    mount a virtual filesystem (such as <systemitem
35    class="filesystem">tmpfs</systemitem>) on the <filename
36    class="directory">/dev</filename> directory, and allow the devices
37    to be created dynamically on that virtual filesystem as they are
38    detected or accessed. This is generally done during the boot process.
39    Since this new system has not been booted, it is necessary to do what
40    the LFS-Bootscripts package would otherwise do by mounting <filename
41    class="directory">/dev</filename>:</para>
42
43<screen><userinput>mount -n -vt tmpfs none /dev</userinput></screen>
44
45    <para>The Udev package is what actually creates the devices in the
46    <filename class="directory">/dev</filename> directory. Since it will
47    not be installed until later on in the process, manually create the
48    minimal set of device nodes needed to complete the building of this
49    system:</para>
50
51<screen><userinput>mknod -m 622 /dev/console c 5 1
52mknod -m 666 /dev/null c 1 3
53mknod -m 666 /dev/zero c 1 5
54mknod -m 666 /dev/ptmx c 5 2
55mknod -m 666 /dev/tty c 5 0
56mknod -m 444 /dev/random c 1 8
57mknod -m 444 /dev/urandom c 1 9
58chown -v root:tty /dev/{console,ptmx,tty}</userinput></screen>
59
60    <para>There are some symlinks and directories required by LFS that
61    are created during system startup by the LFS-Bootscripts package. Since
62    this is a chroot environment and not a booted environment, those symlinks
63    and directories need to be created here:</para>
64
65<screen><userinput>ln -sv /proc/self/fd /dev/fd
66ln -sv /proc/self/fd/0 /dev/stdin
67ln -sv /proc/self/fd/1 /dev/stdout
68ln -sv /proc/self/fd/2 /dev/stderr
69ln -sv /proc/kcore /dev/core
70mkdir -v /dev/pts
71mkdir -v /dev/shm</userinput></screen>
72
73    <para>Finally, mount the proper virtual (kernel) file systems on the
74    newly-created directories:</para>
75
76<screen><userinput>mount -vt devpts -o gid=4,mode=620 none /dev/pts
77mount -vt tmpfs none /dev/shm</userinput></screen>
78
79    <para>The <command>mount</command> commands executed above may result
80    in the following warning message:</para>
81
82<screen><computeroutput>can't open /etc/fstab: No such file or directory.</computeroutput></screen>
83
84    <para>This file&mdash;<filename>/etc/fstab</filename>&mdash;has not
85    been created yet but is also not required for the file systems to be
86    properly mounted. As such, the warning can be safely ignored.</para>
87
88  </sect2>
89
90</sect1>
Note: See TracBrowser for help on using the repository browser.