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Diffstat (limited to 'chapter07/usage.xml')
| -rw-r--r-- | chapter07/usage.xml | 57 |
1 files changed, 27 insertions, 30 deletions
diff --git a/chapter07/usage.xml b/chapter07/usage.xml index 5baede25b..9e6672d3e 100644 --- a/chapter07/usage.xml +++ b/chapter07/usage.xml @@ -11,21 +11,19 @@ <primary sortas="a-Bootscripts">Bootscripts</primary> <secondary>usage</secondary></indexterm> -<para>Linux uses a special booting facility named SysVinit that is -based on a concept of <emphasis>run-levels</emphasis>. It can be quite -different from one system to another, so it cannot be assumed that -because things worked in <insert distro name>, they should work -the same in LFS too. LFS has its own way of doing things, but it -respects generally accepted standards.</para> - -<para>SysVinit (which will be referred to as <quote>init</quote> from -now on) works using a run-levels scheme. There are seven (from 0 to 6) -run-levels (actually, there are more run-levels, but they are for -special cases and are generally not used. The init man page describes -those details), and each one of those corresponds to the actions the -computer is supposed to perform when it starts up. The default -run-level is 3. Here are the descriptions of the different run-levels -as they are implemented:</para> +<para>Linux uses a special booting facility named SysVinit that is based on a +concept of <emphasis>run-levels</emphasis>. It can be quite different from one +system to another, so it cannot be assumed that because things worked in one +particular Linux distribution, they should work the same in LFS too. LFS has its +own way of doing things, but it respects generally accepted standards.</para> + +<para>SysVinit (which will be referred to as <quote>init</quote> from now on) +works using a run-levels scheme. There are seven (from 0 to 6) run-levels +(actually, there are more run-levels, but they are for special cases and are +generally not used. The init manual page describes those details), and each one +of those corresponds to the actions the computer is supposed to perform when it +starts up. The default run-level is 3. Here are the descriptions of the +different run-levels as they are implemented:</para> <literallayout>0: halt the computer 1: single-user mode @@ -37,24 +35,23 @@ as they are implemented:</para> <para>The command used to change run-levels is <command>init <replaceable>[runlevel]</replaceable></command>, where -<replaceable>[runlevel]</replaceable> is the target run-level. For -example, to reboot the computer, a user would issue the <command>init -6</command> command. The <command>reboot</command> command is an -alias for it, as is the <command>halt</command> command an alias for -<command>init 0</command>.</para> +<replaceable>[runlevel]</replaceable> is the target run-level. For example, to +reboot the computer, a user could issue the <command>init 6</command> command, +which is an alias for the <command>reboot</command> command. Likewise, +<command>init 0</command> is an alias for the <command>halt</command> +command.</para> <para>There are a number of directories under <filename class="directory">/etc/rc.d</filename> that look like <filename -class="directory">rc?.d</filename> (where ? is the number of the -run-level) and <filename class="directory">rcsysinit.d</filename>, all -containing a number of symbolic links. Some begin with a -<emphasis>K</emphasis>, the others begin with an -<emphasis>S</emphasis>, and all of them have two numbers following the -initial letter. The K means to stop (kill) a service and the S means -to start a service. The numbers determine the order in which the -scripts are run, from 00 to 99—the lower the number the earlier it -gets executed. When init switches to another run-level, the -appropriate services get killed and others get started.</para> +class="directory">rc?.d</filename> (where ? is the number of the run-level) and +<filename class="directory">rcsysinit.d</filename>, all containing a number of +symbolic links. Some begin with a <emphasis>K</emphasis>, the others begin with +an <emphasis>S</emphasis>, and all of them have two numbers following the +initial letter. The K means to stop (kill) a service and the S means to start a +service. The numbers determine the order in which the scripts are run, from 00 +to 99—the lower the number the earlier it gets executed. When +<command>init</command> switches to another run-level, the appropriate services +are either started or stopped, depending on the runlevel chosen.</para> <para>The real scripts are in <filename class="directory">/etc/rc.d/init.d</filename>. They do the actual |