- Timestamp:
- 10/13/2012 04:14:09 PM (12 years ago)
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- 10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, 7.3, 7.4, 7.5, 7.5-systemd, 7.6, 7.6-systemd, 7.7, 7.7-systemd, 7.8, 7.8-systemd, 7.9, 7.9-systemd, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, 9.1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc
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- Parents:
- 5cef314
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chapter07/site.xml
r5cef314 r12574f2 33 33 <screen role="auto">&site;</screen> 34 34 35 <sect2> 36 <title>Customizing the Boot and Shutdown Scripts</title> 37 38 <para>The LFS boot scripts boot and shut down a system in a fairly 39 efficient manner, but there are a few tweaks that you can make in the 40 rc.site file to improve speed even more and to adjust messages accoring 41 to your preferences. To do this, adjust the settings in 42 the <filename>/etc/sysconfig/rc.site</filename> file above.</para> 43 44 <itemizedlist> 45 46 <listitem><para>During the boot script <filename>udev</filename>, there is 47 a call to <command>udev settle</command> that requires some time to 48 complete. This time may or may not be required depending on devices present 49 in the system. If you only have simple partitions and a single ethernet 50 card, the boot process will probably not need to wait for this command. To 51 skip it, set the variable OMIT_UDEV_SETTLE=y.</para></listitem> 52 53 <listitem><para>The boot script <filename>udev_retry</filename> also runs 54 <command>udev settle</command> by default. This command is only needed by 55 default if the <filename class='directory'>/var</filename> directory is 56 separately mounted. This is because the clock needs the file 57 <filename>/var/lib/hwclock/adjtime</filename>. Other customizations may 58 also need to wait for udev to complete, but in many installations it is not 59 needed. Skip the command by setting the variable OMIT_UDEV_RETRY_SETTLE=y. 60 </para></listitem> 61 62 <listitem><para>By default, the file system checks are silent. This can 63 appear to be a delay during the bootup process. To turn on the 64 <command>fsck</command> output, set the variable VERBOSE_FSCK=y. 65 </para></listitem> 66 67 <listitem><para>When rebooting, you may want to skip the filesystem check, 68 <command>fsck</command>, completely. To do this, either create the file 69 <filename>/fastboot</filename> or reboot the system with the command 70 <command>/sbin/shutdown -f -r now</command>. On the other hand, you can 71 force all file systems to be checked by creating 72 <filename>/forcefsck</filename> or running <command>shutdown</command> with 73 the <parameter>-F</parameter> parameter instead of <parameter>-f</parameter>. 74 </para> 75 76 <para>Setting the variable FASTBOOT=y will disable <command>fsck</command> 77 during the boot process until it is removed. This is not recommended 78 on a permanent basis.</para></listitem> 79 80 <listitem><para>Normally, all files in the <filename 81 class='directory'>/tmp</filename> directory are deleted at boot time. 82 Depending on the number of files or directories present, this can cause a 83 noticible delay in the boot process. To skip removing these files set the 84 variable SKIPTMPCLEAN=y.</para></listitem> 85 86 <listitem><para>During shutdown, the <command>init</command> program sends 87 a TERM signal to each program it has started (e.g. agetty), waits for a set 88 time (default 3 seconds), and sends each process a KILL signal and waits 89 again. This process is repeated in the <command>sendsignals</command> 90 script for any processes that are not shut down by their own scripts. The 91 delay for <command>init</command> can be set by passing a parameter. For 92 example to remove the delay in <command>init</command>, pass the -t0 93 parameter when shutting down or rebooting (e.g. <command>/sbin/shutdown 94 -t0 -r now</command>). The delay for the <command>sendsignals</command> 95 script can be skipped by setting the parameter 96 KILLDELAY=0.</para></listitem> 97 98 </itemizedlist> 99 100 </sect2> 101 35 102 </sect1> 36 103
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