1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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5 | <!ENTITY site SYSTEM "../appendices/rc.site.script">
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6 | %general-entities;
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7 | ]>
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8 |
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9 | <sect1 id="ch-scripts-site">
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10 | <?dbhtml filename="site.html"?>
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11 |
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12 | <title>The rc.site File</title>
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13 |
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14 | <indexterm zone="ch-scripts-site">
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15 | <primary sortas="a-rc.site">rc.site</primary>
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16 | </indexterm>
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17 |
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18 | <para>The optional <filename>/etc/sysconfig/rc.site</filename> file contains
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19 | settings that are automatically set for each boot script. It can alternatively
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20 | set the values specified in the <filename>hostname</filename>,
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21 | <filename>console</filename>, and <filename>clock</filename> files in the
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22 | <filename class='directory'>/etc/sysconfig/</filename> directory. If the
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23 | associated variables are present in both these separate files and
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24 | <filename>rc.site</filename>, the values in the script specific files have
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25 | precedence. </para>
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26 |
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27 | <para><filename>rc.site</filename> also contains parameters that can
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28 | customize other aspects of the boot process. Setting the IPROMPT variable
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29 | will enable selective running of bootscripts. Other options are described
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30 | in the file comments. The default version of the file is as follows:</para>
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31 |
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32 | <!-- Use role to fix a pdf generation problem -->
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33 | <screen role="auto">&site;</screen>
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34 |
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35 | <sect2>
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36 | <title>Customizing the Boot and Shutdown Scripts</title>
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37 |
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38 | <para>The LFS boot scripts boot and shut down a system in a fairly
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39 | efficient manner, but there are a few tweaks that you can make in the
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40 | rc.site file to improve speed even more and to adjust messages according
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41 | to your preferences. To do this, adjust the settings in
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42 | the <filename>/etc/sysconfig/rc.site</filename> file above.</para>
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43 |
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44 | <itemizedlist>
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45 |
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46 | <listitem><para>During the boot script <filename>udev</filename>, there is
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47 | a call to <command>udev settle</command> that requires some time to
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48 | complete. This time may or may not be required depending on devices present
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49 | in the system. If you only have simple partitions and a single ethernet
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50 | card, the boot process will probably not need to wait for this command. To
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51 | skip it, set the variable OMIT_UDEV_SETTLE=y.</para></listitem>
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52 |
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53 | <listitem><para>The boot script <filename>udev_retry</filename> also runs
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54 | <command>udev settle</command> by default. This command is only needed by
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55 | default if the <filename class='directory'>/var</filename> directory is
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56 | separately mounted. This is because the clock needs the file
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57 | <filename>/var/lib/hwclock/adjtime</filename>. Other customizations may
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58 | also need to wait for udev to complete, but in many installations it is not
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59 | needed. Skip the command by setting the variable OMIT_UDEV_RETRY_SETTLE=y.
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60 | </para></listitem>
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61 |
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62 | <listitem><para>By default, the file system checks are silent. This can
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63 | appear to be a delay during the bootup process. To turn on the
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64 | <command>fsck</command> output, set the variable VERBOSE_FSCK=y.
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65 | </para></listitem>
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66 |
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67 | <listitem><para>When rebooting, you may want to skip the filesystem check,
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68 | <command>fsck</command>, completely. To do this, either create the file
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69 | <filename>/fastboot</filename> or reboot the system with the command
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70 | <command>/sbin/shutdown -f -r now</command>. On the other hand, you can
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71 | force all file systems to be checked by creating
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72 | <filename>/forcefsck</filename> or running <command>shutdown</command> with
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73 | the <parameter>-F</parameter> parameter instead of <parameter>-f</parameter>.
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74 | </para>
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75 |
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76 | <para>Setting the variable FASTBOOT=y will disable <command>fsck</command>
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77 | during the boot process until it is removed. This is not recommended
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78 | on a permanent basis.</para></listitem>
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79 |
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80 | <listitem><para>Normally, all files in the <filename
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81 | class='directory'>/tmp</filename> directory are deleted at boot time.
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82 | Depending on the number of files or directories present, this can cause a
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83 | noticeable delay in the boot process. To skip removing these files set the
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84 | variable SKIPTMPCLEAN=y.</para></listitem>
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85 |
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86 | <listitem><para>During shutdown, the <command>init</command> program sends
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87 | a TERM signal to each program it has started (e.g. agetty), waits for a set
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88 | time (default 3 seconds), and sends each process a KILL signal and waits
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89 | again. This process is repeated in the <command>sendsignals</command>
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90 | script for any processes that are not shut down by their own scripts. The
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91 | delay for <command>init</command> can be set by passing a parameter. For
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92 | example to remove the delay in <command>init</command>, pass the -t0
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93 | parameter when shutting down or rebooting (e.g. <command>/sbin/shutdown
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94 | -t0 -r now</command>). The delay for the <command>sendsignals</command>
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95 | script can be skipped by setting the parameter
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96 | KILLDELAY=0.</para></listitem>
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97 |
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98 | </itemizedlist>
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99 |
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100 | </sect2>
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101 |
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102 | </sect1>
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103 |
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