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Add a section on nix-serve
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doc/manual/packages/binary-cache-substituter.xml
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doc/manual/packages/binary-cache-substituter.xml
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<section 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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version="5.0"
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xml:id="ssec-binary-cache-substituter">
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<title>Serving a Nix store via HTTP</title>
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<para>You can easily share the Nix store of a machine via HTTP. This
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allows other machines to fetch store paths from that machine to speed
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up installations. It uses the same <emphasis>binary cache</emphasis>
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mechanism that Nix usually uses to fetch pre-built binaries from
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<uri>https://cache.nixos.org</uri>.</para>
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<para>The daemon that handles binary cache requests via HTTP,
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<command>nix-serve</command>, is not part of the Nix distribution, but
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you can install it from Nixpkgs:
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<screen>
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$ nix-env -i nix-serve
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</screen>
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You can then start the server, listening for HTTP connections on
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whatever port you like:
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<screen>
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$ nix-serve -p 8080
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</screen>
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To check whether it works, try the following on the client:
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<screen>
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$ curl http://avalon:8080/nix-cache-info
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</screen>
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which should print something like:
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<screen>
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StoreDir: /nix/store
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WantMassQuery: 1
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Priority: 30
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</screen>
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</para>
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<para>On the client side, you can tell Nix to use your binary cache
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using <option>--option extra-binary-caches</option>, e.g.:
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<screen>
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$ nix-env -i firefox --option extra-binary-caches http://avalon:8080/
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</screen>
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The option <option>extra-binary-caches</option> tells Nix to use this
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binary cache in addition to your default caches, such as
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<uri>https://cache.nixos.org</uri>. Thus, for any path in the closure
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of Firefox, Nix will first check if the path is available on the
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server <literal>avalon</literal> or another binary caches. If not, it
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will fall back to building from source.</para>
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<para>You can also tell Nix to always use your binary cache by adding
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a line to the <filename linkend="sec-conf-file">nix.conf</filename>
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configuration file like this:
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<programlisting>
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binary-caches = http://avalon:8080/ https://cache.nixos.org/
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</programlisting>
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</para>
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</section>
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@ -4,7 +4,7 @@
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version="5.0"
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xml:id="ssec-copy-closure">
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<title>Copying Closures</title>
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<title>Copying Closures Via SSH</title>
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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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@ -12,6 +12,7 @@ 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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<xi:include href="binary-cache-substituter.xml" />
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<xi:include href="copy-closure.xml" />
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<xi:include href="ssh-substituter.xml" />
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