source: BOOK/chroot/common/kernfs.xml@ e0e2e20

clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since e0e2e20 was 849369d, checked in by Chris Staub <chris@…>, 11 years ago

Update eudev reference to systemd

  • Property mode set to 100644
File size: 2.6 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/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/2001/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 ${CLFS}/{dev,proc,sys}</userinput></screen>
26
27 <para>Now mount the file systems:</para>
28
29<screen><userinput>mount -vt proc proc ${CLFS}/proc
30mount -vt sysfs sysfs ${CLFS}/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 Eudev early in the boot process, so we create them here:</para>
39
40<screen><userinput>mknod -m 600 ${CLFS}/dev/console c 5 1
41mknod -m 666 ${CLFS}/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 Udev, part of Systemd. 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>mount -v -o bind /dev ${CLFS}/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>if [ -h ${CLFS}/dev/shm ]; then
57 link=$(readlink ${CLFS}/dev/shm)
58 mkdir -p ${CLFS}/$link
59 mount -f -vt tmpfs shm ${CLFS}/$link
60 unset link
61else
62 mount -f -vt tmpfs shm ${CLFS}/dev/shm
63fi
64mount -f -vt devpts -o gid=&gid-tty;,mode=620 devpts ${CLFS}/dev/pts</userinput></screen>
65
66</sect1>
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