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26 lines
1.1 KiB
XML
26 lines
1.1 KiB
XML
<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-nix-network-issues">
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<title>Network Problems</title>
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<para>
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Nix uses a so-called <emphasis>binary cache</emphasis> to optimise
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building a package from source into downloading it as a pre-built
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binary. That is, whenever a command like
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<literal>nixos-rebuild</literal> needs a path in the Nix store, Nix
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will try to download that path from the Internet rather than build
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it from source. The default binary cache is
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<literal>https://cache.nixos.org/</literal>. If this cache is
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unreachable, Nix operations may take a long time due to HTTP
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connection timeouts. You can disable the use of the binary cache by
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adding <literal>--option use-binary-caches false</literal>, e.g.
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</para>
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<programlisting>
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# nixos-rebuild switch --option use-binary-caches false
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</programlisting>
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<para>
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If you have an alternative binary cache at your disposal, you can
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use it instead:
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</para>
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<programlisting>
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# nixos-rebuild switch --option binary-caches http://my-cache.example.org/
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</programlisting>
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</section>
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