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<li class="md-nav__item">
<a href="#anonymous-reads-to-your-s3-compatible-binary-cache" class="md-nav__link">
<span class="md-ellipsis">
Anonymous Reads to your S3-compatible binary cache
</span>
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<a href="#authenticated-reads-to-your-s3-binary-cache" class="md-nav__link">
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Authenticated Reads to your S3 binary cache
</span>
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<a href="#authenticated-writes-to-your-s3-compatible-binary-cache" class="md-nav__link">
<span class="md-ellipsis">
Authenticated Writes to your S3-compatible binary cache
</span>
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Examples
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<h1 id="serving-a-nix-store-via-s3">Serving a Nix store via S3</h1>
<p>Lix has <a href="../../Command-Reference/New-CLI/nix3-help-stores/#s3-binary-cache-store">built-in support</a>
for storing and fetching store paths from Amazon S3 and S3-compatible services.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>FIXME(Lix): document the correct setup to fetch from a s3 cache via HTTP rather than just through <code>s3://</code> (which works, but forces you to remain s3-like on the client side)</p>
</div>
<!--
FIXME(Lix): no it doesn't! cache.nixos.org is just http!
This uses the same *binary*
cache mechanism that Lix usually uses to fetch prebuilt binaries from
[cache.nixos.org](https://cache.nixos.org/).
-->
<p>In this example we will use the bucket named <code>example-nix-cache</code>.</p>
<h3 id="anonymous-reads-to-your-s3-compatible-binary-cache">Anonymous Reads to your S3-compatible binary cache</h3>
<p>If your binary cache is publicly accessible and does not require
authentication, the simplest and easiest way to use Lix with your S3
compatible binary cache is to use the HTTP URL for that cache.</p>
<p>For AWS S3 the binary cache URL for example bucket will be exactly
<a href="https://example-nix-cache.s3.amazonaws.com">https://example-nix-cache.s3.amazonaws.com</a> or
<s3://example-nix-cache>. For S3 compatible binary caches, consult that
cache's documentation.</p>
<p>Your bucket will need the following bucket policy:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="w"> </span><span class="nt">&quot;Id&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;DirectReads&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Version&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;2012-10-17&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Statement&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">&quot;Sid&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;AllowDirectReads&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Action&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="s2">&quot;s3:GetObject&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:GetBucketLocation&quot;</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">&quot;Effect&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Allow&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Resource&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="s2">&quot;arn:aws:s3:::example-nix-cache&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;arn:aws:s3:::example-nix-cache/*&quot;</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">&quot;Principal&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;*&quot;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">]</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="authenticated-reads-to-your-s3-binary-cache">Authenticated Reads to your S3 binary cache</h3>
<p>For AWS S3 the binary cache URL for example bucket will be exactly
<s3://example-nix-cache>.</p>
<p>Lix will use the <a href="https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/credentials.html">default credential provider
chain</a>
for authenticating requests to Amazon S3.</p>
<p>Lix supports authenticated reads from Amazon S3 and S3 compatible binary
caches.</p>
<p>Your bucket will need a bucket policy allowing the desired users to
perform the <code>s3:GetObject</code> and <code>s3:GetBucketLocation</code> action on all
objects in the bucket. The <a href="#anonymous-reads-to-your-s3-compatible-binary-cache">anonymous policy given
above</a> can be
updated to have a restricted <code>Principal</code> to support this.</p>
<h3 id="authenticated-writes-to-your-s3-compatible-binary-cache">Authenticated Writes to your S3-compatible binary cache</h3>
<p>Lix support fully supports writing to Amazon S3 and S3 compatible
buckets. The binary cache URL for our example bucket will be
<s3://example-nix-cache>.</p>
<p>Lix will use the <a href="https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/credentials.html">default credential provider
chain</a>
for authenticating requests to Amazon S3.</p>
<p>Your account will need the following IAM policy to upload to the cache:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="w"> </span><span class="nt">&quot;Version&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;2012-10-17&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Statement&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">&quot;Sid&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;UploadToCache&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Effect&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Allow&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nt">&quot;Action&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="s2">&quot;s3:AbortMultipartUpload&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:GetBucketLocation&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:GetObject&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:ListBucket&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:ListBucketMultipartUploads&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:ListMultipartUploadParts&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;s3:PutObject&quot;</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">&quot;Resource&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="s2">&quot;arn:aws:s3:::example-nix-cache&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s2">&quot;arn:aws:s3:::example-nix-cache/*&quot;</span>
<span class="w"> </span><span class="p">]</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">]</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="examples">Examples</h3>
<p>To upload with a specific credential profile for Amazon S3:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix<span class="w"> </span>copy<span class="w"> </span>nixpkgs.hello<span class="w"> </span>
<span class="go"> --to &#39;s3://example-nix-cache?profile=cache-upload&amp;region=eu-west-2&#39;</span>
</code></pre></div>
<p>To upload to an S3-compatible binary cache:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix<span class="w"> </span>copy<span class="w"> </span>nixpkgs.hello<span class="w"> </span>--to<span class="w"> </span>
<span class="go"> &#39;s3://example-nix-cache?profile=cache-upload&amp;scheme=https&amp;endpoint=minio.example.com&#39;</span>
</code></pre></div>
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