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Manuel Canales Esparcia 2005-05-07 12:12:52 +00:00
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introduction/important/position.xml
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]>
<sect1 id="intro-important-position">
<sect1info>
<othername>$LastChangedBy$</othername>
<date>$Date$</date>
</sect1info>
<?dbhtml filename="position.html"?>
<title>The /usr versus /usr/local debate</title>
<?dbhtml filename="position.html"?>
<para><emphasis>Should I install XXX in <filename>/usr</filename> or
<filename>/usr/local</filename>?</emphasis></para>
<sect1info>
<othername>$LastChangedBy$</othername>
<date>$Date$</date>
</sect1info>
<para>This is a question without an obvious answer for an
<acronym>LFS</acronym> based system.</para>
<title>The /usr Versus /usr/local Debate</title>
<para>In traditional Unix systems, <filename>/usr</filename> usually
contains files that come with the system distribution, and the <filename>
/usr/local</filename> tree is free for the local administrator to manage.
The only really hard and fast rule is that Unix distributions should not
touch <filename>/usr/local</filename>, except perhaps to create the basic
directories within it.</para>
<para><emphasis>Should I install XXX in <filename>/usr</filename> or
<filename>/usr/local</filename>?</emphasis></para>
<para>With Linux distributions, like Red Hat, Debian etc. a possible rule is
that <filename>/usr</filename> is managed by the distribution's
package system and <filename>/usr/local</filename> is not. This way the
package manager's database knows about every file within
<filename>/usr</filename>.</para>
<para>This is a question without an obvious answer for an
LFS based system.</para>
<para><acronym>LFS</acronym> users build their own system and so deciding where
the system ends and local files begin is not straightforward. So the choice
should be made in order to make things easier to administer. There are several
reasons for dividing files between <filename>/usr</filename> and
<filename>/usr/local</filename>.</para>
<para>In traditional Unix systems, <filename>/usr</filename> usually
contains files that come with the system distribution, and the <filename>
/usr/local</filename> tree is free for the local administrator to manage.
The only really hard and fast rule is that Unix distributions should not
touch <filename>/usr/local</filename>, except perhaps to create the basic
directories within it.</para>
<itemizedlist>
<para>With Linux distributions, like Red Hat, Debian etc. a possible rule is
that <filename>/usr</filename> is managed by the distribution's
package system and <filename>/usr/local</filename> is not. This way the
package manager's database knows about every file within
<filename>/usr</filename>.</para>
<listitem><para>On a network of several machines all running <acronym>LFS</acronym>,
or mixed <acronym>LFS</acronym> and other Linux distributions,
<filename>/usr/local</filename> could be used to hold packages
that are common between all the computers in the network. It can be
<acronym>NFS</acronym> mounted or mirrored from a single server. Here local
indicates local to the site.</para></listitem>
<para>LFS users build their own system and so deciding where
the system ends and local files begin is not straightforward. So the choice
should be made in order to make things easier to administer. There are several
reasons for dividing files between <filename>/usr</filename> and
<filename>/usr/local</filename>.</para>
<listitem><para>On a network of several computers all running an identical
<acronym>LFS</acronym> system <filename>/usr/local</filename> could hold
packages that are different between the machines. In this case local refers
to the individual computers.</para></listitem>
<itemizedlist>
<listitem>
<para>On a network of several machines all running LFS,
or mixed LFS and other Linux distributions,
<filename>/usr/local</filename> could be used to hold packages
that are common between all the computers in the network. It can be
NFS mounted or mirrored from a single server. Here local
indicates local to the site.</para>
</listitem>
<listitem>
<para>On a network of several computers all running an identical
LFS system <filename>/usr/local</filename> could hold
packages that are different between the machines. In this case local refers
to the individual computers.</para>
</listitem>
<listitem>
<para>Even on a single computer <filename>/usr/local</filename> can
be useful if you have several distributions installed simultaneously, and want
a place to put packages that will be the same on all of them.</para>
</listitem>
<listitem>
<para>Or you might regularly rebuild your LFS, but
want a place to put files that you don't want to rebuild each time. This way
you can wipe the LFS file system and start from a clean
partition every time without losing everything.</para>
</listitem>
</itemizedlist>
<listitem><para>Even on a single computer <filename>/usr/local</filename> can
be useful if you have several distributions installed simultaneously, and want
a place to put packages that will be the same on all of them.</para></listitem>
<para>Some people ask why not use your own directory tree, e.g., <filename>
/usr/site</filename>, rather than <filename>/usr/local</filename>?</para>
<listitem><para>Or you might regularly rebuild your <acronym>LFS</acronym>, but
want a place to put files that you don't want to rebuild each time. This way
you can wipe the <acronym>LFS</acronym> file system and start from a clean
partition every time without losing everything.</para></listitem>
<para>There is nothing stopping you, many sites do make their own trees,
however it makes installing new software more difficult. Automatic installers
often look for dependencies in <filename>/usr</filename> and
<filename>/usr/local</filename>, and if the file it is looking
for is in <filename>/usr/site</filename> instead, the installer will
probably fail unless you specifically tell it where to look.</para>
</itemizedlist>
<para><emphasis>What is the BLFS position on this?</emphasis></para>
<para>Some people ask why not use your own directory tree, e.g., <filename>
/usr/site</filename>, rather than <filename>/usr/local</filename>?</para>
<para>There is nothing stopping you, many sites do make their own trees,
however it makes installing new software more difficult. Automatic installers
often look for dependencies in <filename>/usr</filename> and
<filename>/usr/local</filename>, and if the file it is looking
for is in <filename>/usr/site</filename> instead, the installer will
probably fail unless you specifically tell it where to look.</para>
<para><emphasis>What is the <acronym>BLFS</acronym> position on this?</emphasis>
</para>
<para>All of the <acronym>BLFS</acronym> instructions install programs in
<filename>/usr</filename> with optional instructions to install into
<filename>/opt</filename> for some specific packages.</para>
<para>All of the BLFS instructions install programs in
<filename>/usr</filename> with optional instructions to install into
<filename>/opt</filename> for some specific packages.</para>
</sect1>