* Documented some of the sharing mechanisms.
This commit is contained in:
Eelco Dolstra
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2369b122d1
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@ -16,12 +16,14 @@ man1_MANS = nix-env.1 nix-build.1 nix-store.1 nix-instantiate.1 \
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nix-prefetch-url.1 nix-channel.1 \
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nix-install-package.1 nix-hash.1 nix-copy-closure.1
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man8_MANS = nix-worker.8
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FIGURES = figures/user-environments.png
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MANUAL_SRCS = manual.xml introduction.xml installation.xml \
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package-management.xml writing-nix-expressions.xml builtins.xml \
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build-farm.xml \
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$(man1_MANS:.1=.xml) \
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$(man1_MANS:.1=.xml) $(man8_MANS:.8=.xml) \
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troubleshooting.xml bugs.xml opt-common.xml opt-common-syn.xml \
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env-common.xml quick-start.xml nix-lang-ref.xml glossary.xml \
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conf-file.xml release-notes.xml \
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@ -274,6 +274,27 @@ $ mount -o bind /mnt/otherdisk/nix /nix</screen>
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</varlistentry>
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<varlistentry xml:id="envar-other-stores"><term><envar>NIX_OTHER_STORES</envar></term>
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<listitem><para>This variable contains the paths of remote Nix
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installations from whichs paths can be copied, separated by colons.
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See <xref linkend="sec-sharing-packages" /> for details. Each path
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should be the <filename>/nix</filename> directory of a remote Nix
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installation (i.e., not the <filename>/nix/store</filename>
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directory). The paths are subject to globbing, so you can set it so
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something like <literal>/var/run/nix/remote-stores/*/nix</literal>
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and mount multiple remote filesystems in
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<literal>/var/run/nix/remote-stores</literal>.</para>
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<para>Note that if you’re building through the <link
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linkend="sec-nix-worker">Nix daemon</link>, the only setting for
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this variable that matters is the one that the
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<command>nix-worker</command> process uses. So if you want to
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change it, you have to restart the daemon.</para></listitem>
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</varlistentry>
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</variablelist>
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@ -336,8 +336,8 @@ $ chown -R root /nix/store /nix/var/nix</screen>
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</para>
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<para>The Nix daemon should be started as follows (as
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<literal>root</literal>):
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<para>The <link linkend="sec-nix-worker">Nix daemon</link> should be
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started as follows (as <literal>root</literal>):
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<screen>
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$ nix-worker --daemon</screen>
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@ -28,7 +28,7 @@
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<holder>Eelco Dolstra</holder>
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</copyright>
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<date>June 2008</date>
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<date>November 2008</date>
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</info>
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@ -101,6 +101,10 @@
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<title>nix-push</title>
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<xi:include href="nix-push.xml" />
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</section>
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<section xml:id="sec-nix-worker">
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<title>nix-worker</title>
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<xi:include href="nix-worker.xml" />
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</section>
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</section>
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</appendix>
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@ -128,7 +128,7 @@ those paths. If this bothers you, use
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<para>Copy Firefox with all its dependencies to a remote machine:
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<screen>
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$ nix-copy-closure alice@itchy.labs $(type -tP firefox)</screen>
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$ nix-copy-closure --to alice@itchy.labs $(type -tP firefox)</screen>
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</para>
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@ -0,0 +1,34 @@
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<refentry xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refmeta>
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<refentrytitle>nix-worker</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">Nix</refmiscinfo>
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<refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>nix-worker</refname>
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<refpurpose>Nix multi-user support daemon</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-worker</command>
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<arg choice="plain"><option>--daemon</option></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>The Nix daemon is necessary in multi-user Nix installations. It
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performs build actions and other operations on the Nix store on behalf
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of unprivileged users.</para>
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</refsection>
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</refentry>
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@ -528,4 +528,82 @@ linkend='sec-nix-install-package' /> for details.</para>
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</section>
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<section xml:id="sec-sharing-packages"><title>Sharing packages between machines</title>
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<para>Sometimes you want to copy a package from one machine to
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another. Or, you want to install some packages and you know that
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another machine already has some or all of those packages or their
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dependencies. In that case there are mechanisms to quickly copy
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packages between machines.</para>
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<para>The command <command
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linkend="sec-nix-copy-closure">nix-copy-closure</command> copies a Nix
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store path along with all its dependencies to or from another machine
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via the SSH protocol. It doesn’t copy store paths that are already
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present on the target machine. For example, the following command
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copies Firefox with all its dependencies:
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<screen>
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$ nix-copy-closure --to alice@itchy.example.org $(type -p firefox)</screen>
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See <xref linkend='sec-nix-copy-closure' /> for details.</para>
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<para>With <command linkend='refsec-nix-store-export'>nix-store
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--export</command> and <command
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linkend='refsec-nix-store-import'>nix-store --import</command> you can
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write the closure of a store path (that is, the path and all its
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dependencies) to a file, and then unpack that file into another Nix
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store. For example,
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<screen>
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$ nix-store --export $(type -p firefox) > firefox.closure</screen>
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writes the closure of Firefox to a file. You can then copy this file
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to another machine and install the closure:
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<screen>
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$ nix-store --import < firefox.closure</screen>
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Any store paths in the closure that are already present in the target
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store are ignored. It is also possible to pipe the export into
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another command, e.g. to copy and install a closure directly to/on
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another machine:
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<screen>
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$ nix-store --export $(type -p firefox) | bzip2 | \
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ssh alice@itchy.example.org "bunzip2 | nix-store --import"</screen>
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But note that <command>nix-copy-closure</command> is generally more
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efficient in this example because it only copies paths that are not
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already present in the target Nix store.</para>
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<para>Finally, if you can mount the Nix store of a remote machine in
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your local filesystem, Nix can copy paths from the remote Nix store to
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the local Nix store <emphasis>on demand</emphasis>. For instance,
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suppose that you mount a remote machine containing a Nix store via
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<command
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xlink:href="http://fuse.sourceforge.net/sshfs.html">sshfs</command>:
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<screen>
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$ sshfs alice@itchy.example.org:/ /mnt</screen>
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You should then set the <envar>NIX_OTHER_STORES</envar> environment
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variable to tell Nix about this remote Nix store:
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<screen>
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$ export NIX_OTHER_STORES=/mnt/nix</screen>
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Then if you do any Nix operation, e.g.
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<screen>
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$ nix-env -i firefox</screen>
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and Nix has to build a path that it sees is already present in
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<filename>/mnt/nix</filename>, then it will just copy from there
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instead of building it from source.</para>
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</section>
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</chapter>
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