22 lines
841 B
Markdown
22 lines
841 B
Markdown
# Network Problems {#sec-nix-network-issues}
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Nix uses a so-called *binary cache* to optimise building a package from
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source into downloading it as a pre-built binary. That is, whenever a
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command like `nixos-rebuild` needs a path in the Nix store, Nix will try
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to download that path from the Internet rather than build it from
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source. The default binary cache is `https://cache.nixos.org/`. If this
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cache is 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 `--option use-binary-caches false`, e.g.
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```ShellSession
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# nixos-rebuild switch --option use-binary-caches false
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```
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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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```ShellSession
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# nixos-rebuild switch --option binary-caches http://my-cache.example.org/
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```
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