Update docs to describe how s3:// URLS does in fact support endpoint, region, and profile for upload
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Graham Christensen
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f11acbaf17
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@ -12,8 +12,49 @@ from Amazon S3 and S3 compatible services. This uses the same
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<emphasis>binary</emphasis> cache mechanism that Nix usually uses to
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fetch prebuilt binaries from <uri>cache.nixos.org</uri>.</para>
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<para>The following options can be specified as URL parameters to
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the S3 URL:</para>
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<variablelist>
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<varlistentry><term><literal>profile</literal></term>
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<listitem>
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<para>
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The name of the AWS configuration profile to use. By default
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Nix will use the <literal>default</literal> profile.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry><term><literal>region</literal></term>
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<listitem>
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<para>
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The region of the S3 bucket. <literal>us–east-1</literal> by
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default.
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</para>
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<para>
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If your bucket is not in <literal>us–east-1</literal>, you
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should always explicitly specify the region parameter.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry><term><literal>endpoint</literal></term>
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<listitem>
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<para>
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The URL to your S3-compatible service, for when not using
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Amazon S3. Do not specify this value if you're using Amazon
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S3.
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</para>
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<note><para>This endpoint must support HTTPS and will use
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path-based addressing instead of virtual host based
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addressing.</para></note>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>In this example we will use the bucket named
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<literal>example-bucket</literal>.</para>
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<literal>example-nix-cache</literal>.</para>
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<section xml:id="ssec-s3-substituter-anonymous-reads">
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<title>Anonymous Reads to your S3-compatible binary cache</title>
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@ -24,65 +65,56 @@ fetch prebuilt binaries from <uri>cache.nixos.org</uri>.</para>
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cache.</para>
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<para>For AWS S3 the binary cache URL for example bucket will be
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exactly <uri>https://example-bucket.s3.amazonaws.com</uri>. For S3
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compatible binary caches ago have to consult your software's
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documentation.</para>
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exactly <uri>https://example-nix-cache.s3.amazonaws.com</uri> or
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<uri>s3://example-nix-cache</uri>. For S3 compatible binary caches,
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consult that cache's documentation.</para>
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<para>Your bucket will need the following bucket policy:</para>
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<programlisting>
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<![CDATA[
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<programlisting><![CDATA[
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{
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"Id": "DirectReads",
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"Version": "2012-10-17",
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"Statement": [
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{
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"Sid": "AlowDirectReads",
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"Action": [
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"s3:GetObject"
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],
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"Effect": "Allow",
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"Resource": "arn:aws:s3:::example-bucket/*",
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"Principal": "*"
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}
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]
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"Id": "DirectReads",
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"Version": "2012-10-17",
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"Statement": [
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{
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"Sid": "AlowDirectReads",
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"Action": [
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"s3:GetObject",
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"s3:GetBucketLocation"
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],
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"Effect": "Allow",
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"Resource": [
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"arn:aws:s3:::example-nix-cache",
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"arn:aws:s3:::example-nix-cache/*"
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],
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"Principal": "*"
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}
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]
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}
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]]>
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</programlisting>
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]]></programlisting>
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</section>
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<section xml:id="ssec-s3-substituter-authenticated-reads">
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<title>Authenticated Reads to your S3 binary cache</title>
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<para>For AWS S3 the binary cache URL for example bucket will be
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exactly <uri>s3://example-bucket</uri>.</para>
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exactly <uri>s3://example-nix-cache</uri>.</para>
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<para>Nix will use the <link
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xlink:href="https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/credentials.html#credentials-default.">default
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credential provider chain</link> for authenticating requests to
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Amazon S3.</para>
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<para>Nix supports authenticated writes to S3 compatible binary
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caches but only supports Authenticated reads from Amazon S3.
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Additionally, the following limitations are in place for
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authenticated reads:</para>
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<itemizedlist>
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<listitem><para>The bucket must actually be hosted by Amazon S3 and
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<emphasis>not</emphasis> an S3 compatible
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service.</para></listitem>
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<listitem><para>The bucket must be within the
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<literal>us-east-1</literal> region.</para></listitem>
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<listitem><para>The Amazon credentials, if stored in a credential
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profile, must be stored in the <literal>default</literal>
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profile.</para></listitem>
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</itemizedlist>
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<para>Nix supports authenticated reads from Amazon S3 and S3
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compatible binary caches.</para>
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<para>Your bucket will need a bucket policy allowing the desired
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users to perform the <literal>s3:GetObject</literal> action on all
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objects in the bucket.</para>
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users to perform the <literal>s3:GetObject</literal> and
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<literal>s3:GetBucketLocation</literal> action on all objects in the
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bucket. The anonymous policy in <xref
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linkend="ssec-s3-substituter-anonymous-reads" /> can be updated to
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have a restricted <literal>Principal</literal> to support
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this.</para>
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</section>
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@ -91,69 +123,49 @@ fetch prebuilt binaries from <uri>cache.nixos.org</uri>.</para>
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<para>Nix support fully supports writing to Amazon S3 and S3
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compatible buckets. The binary cache URL for our example bucket will
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be <uri>s3://example-bucket</uri>.</para>
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be <uri>s3://example-nix-cache</uri>.</para>
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<para>Nix will use the <link
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xlink:href="https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/credentials.html#credentials-default.">default
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credential provider chain</link> for authenticating requests to
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Amazon S3.</para>
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<para>The following options can be specified as URL parameters to
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the S3 URL:</para>
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<variablelist>
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<varlistentry><term><literal>profile</literal></term>
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<listitem>
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<para>
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The name of the AWS configuration profile to use. By default
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Nix will use the <literal>default</literal> profile.
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</para>
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</listitem>
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</varlistentry>
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<para>Your account will need the following IAM policy to
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upload to the cache:</para>
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<varlistentry><term><literal>region</literal></term>
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<listitem>
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<para>
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The region of the S3 bucket. <literal>us–east-1</literal> by
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default.
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</para>
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</listitem>
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</varlistentry>
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<programlisting><![CDATA[
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{
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"Version": "2012-10-17",
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"Statement": [
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{
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"Sid": "UploadToCache",
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"Effect": "Allow",
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"Action": [
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"s3:AbortMultipartUpload",
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"s3:GetBucketLocation",
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"s3:GetObject",
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"s3:ListBucket",
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"s3:ListBucketMultipartUploads",
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"s3:ListMultipartUploadParts",
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"s3:ListObjects",
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"s3:PutObject"
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],
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"Resource": [
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"arn:aws:s3:::example-nix-cache",
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"arn:aws:s3:::example-nix-cache/*"
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]
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}
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]
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}
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]]></programlisting>
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<varlistentry><term><literal>endpoint</literal></term>
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<listitem>
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<para>
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The URL to your S3-compatible service, for when not using
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Amazon S3. Do not specify this value if you're using Amazon
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S3.
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</para>
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<note><para>This endpoint must support HTTPS and will use
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path-based addressing instead of virtual host based
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addressing.</para></note>
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</listitem>
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</varlistentry>
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</variablelist>
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<example><title>Uploading with non-default credential profile for Amazon S3</title>
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<para><command>nix copy --to ssh://machine nixpkgs.hello s3://example-bucket?profile=cache-upload</command></para>
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<example><title>Uploading with a specific credential profile for Amazon S3</title>
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<para><command>nix copy --to 's3://example-nix-cache?profile=cache-upload&region=eu-west-2' nixpkgs.hello</command></para>
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</example>
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<example><title>Uploading to an S3-Compatible Binary Cache</title>
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<para><command>nix copy --to ssh://machine nixpkgs.hello s3://example-bucket?profile=cache-upload&endpoint=minio.example.com</command></para>
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<para><command>nix copy --to 's3://example-nix-cache?profile=cache-upload&endpoint=minio.example.com' nixpkgs.hello</command></para>
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</example>
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<para>The user writing to the bucket will need to perform the
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following actions against the bucket:</para>
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<itemizedlist>
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<listitem><para><literal>s3:ListBucket</literal></para></listitem>
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<listitem><para><literal>s3:GetBucketLocation</literal></para></listitem>
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<listitem><para><literal>s3:ListObjects</literal></para></listitem>
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<listitem><para><literal>s3:GetObject</literal></para></listitem>
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<listitem><para><literal>s3:PutObject</literal></para></listitem>
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<listitem><para><literal>s3:ListBucketMultipartUploads</literal></para></listitem>
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<listitem><para><literal>s3:CreateMultipartUpload</literal></para></listitem>
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<listitem><para><literal>s3:ListMultipartUploadParts</literal></para></listitem>
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<listitem><para><literal>s3:AbortMultipartUpload</literal></para></listitem>
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</itemizedlist>
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</section>
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</section>
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