2020-04-24 23:36:52 +00:00
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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="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 building a
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package from source into downloading it as a pre-built binary. That is,
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whenever a command like <command>nixos-rebuild</command> needs a path in the
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Nix store, Nix will try to download that path from the Internet rather than
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build it from source. The default binary cache is
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<uri>https://cache.nixos.org/</uri>. If this cache is unreachable, Nix
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operations may take a long time due to HTTP connection timeouts. You can
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disable the use of the binary cache by adding <option>--option
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use-binary-caches false</option>, e.g.
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<screen>
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2020-09-25 04:45:31 +00:00
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<prompt># </prompt>nixos-rebuild switch --option use-binary-caches false
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2020-04-24 23:36:52 +00:00
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</screen>
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If you have an alternative binary cache at your disposal, you can use it
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instead:
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<screen>
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2020-09-25 04:45:31 +00:00
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<prompt># </prompt>nixos-rebuild switch --option binary-caches <replaceable>http://my-cache.example.org/</replaceable>
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2020-04-24 23:36:52 +00:00
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</screen>
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</para>
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</section>
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