nixpkgs/nixos/modules/services/networking/pleroma.xml

<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="module-services-pleroma">
  <title>Pleroma</title>
  <para>
    <link xlink:href="https://pleroma.social/">Pleroma</link> is a
    lightweight activity pub server.
  </para>
  <section xml:id="module-services-pleroma-generate-config">
    <title>Generating the Pleroma config</title>
    <para>
      The <literal>pleroma_ctl</literal> CLI utility will prompt you
      some questions and it will generate an initial config file. This
      is an example of usage
    </para>
    <programlisting>
$ mkdir tmp-pleroma
$ cd tmp-pleroma
$ nix-shell -p pleroma-otp
$ pleroma_ctl instance gen --output config.exs --output-psql setup.psql
</programlisting>
    <para>
      The <literal>config.exs</literal> file can be further customized
      following the instructions on the
      <link xlink:href="https://docs-develop.pleroma.social/backend/configuration/cheatsheet/">upstream
      documentation</link>. Many refinements can be applied also after
      the service is running.
    </para>
  </section>
  <section xml:id="module-services-pleroma-initialize-db">
    <title>Initializing the database</title>
    <para>
      First, the Postgresql service must be enabled in the NixOS
      configuration
    </para>
    <programlisting>
services.postgresql = {
  enable = true;
  package = pkgs.postgresql_13;
};
</programlisting>
    <para>
      and activated with the usual
    </para>
    <programlisting>
$ nixos-rebuild switch
</programlisting>
    <para>
      Then you can create and seed the database, using the
      <literal>setup.psql</literal> file that you generated in the
      previous section, by running
    </para>
    <programlisting>
$ sudo -u postgres psql -f setup.psql
</programlisting>
  </section>
  <section xml:id="module-services-pleroma-enable">
    <title>Enabling the Pleroma service locally</title>
    <para>
      In this section we will enable the Pleroma service only locally,
      so its configurations can be improved incrementally.
    </para>
    <para>
      This is an example of configuration, where
      <xref linkend="opt-services.pleroma.configs" /> option contains
      the content of the file <literal>config.exs</literal>, generated
      <link linkend="module-services-pleroma-generate-config">in the
      first section</link>, but with the secrets (database password,
      endpoint secret key, salts, etc.) removed. Removing secrets is
      important, because otherwise they will be stored publicly in the
      Nix store.
    </para>
    <programlisting>
services.pleroma = {
  enable = true;
  secretConfigFile = &quot;/var/lib/pleroma/secrets.exs&quot;;
  configs = [
    ''
    import Config

    config :pleroma, Pleroma.Web.Endpoint,
      url: [host: &quot;pleroma.example.net&quot;, scheme: &quot;https&quot;, port: 443],
      http: [ip: {127, 0, 0, 1}, port: 4000]

    config :pleroma, :instance,
      name: &quot;Test&quot;,
      email: &quot;admin@example.net&quot;,
      notify_email: &quot;admin@example.net&quot;,
      limit: 5000,
      registrations_open: true

    config :pleroma, :media_proxy,
      enabled: false,
      redirect_on_failure: true

    config :pleroma, Pleroma.Repo,
      adapter: Ecto.Adapters.Postgres,
      username: &quot;pleroma&quot;,
      database: &quot;pleroma&quot;,
      hostname: &quot;localhost&quot;

    # Configure web push notifications
    config :web_push_encryption, :vapid_details,
      subject: &quot;mailto:admin@example.net&quot;

    # ... TO CONTINUE ...
    ''
  ];
};
</programlisting>
    <para>
      Secrets must be moved into a file pointed by
      <xref linkend="opt-services.pleroma.secretConfigFile" />, in our
      case <literal>/var/lib/pleroma/secrets.exs</literal>. This file
      can be created copying the previously generated
      <literal>config.exs</literal> file and then removing all the
      settings, except the secrets. This is an example
    </para>
    <programlisting>
# Pleroma instance passwords

import Config

config :pleroma, Pleroma.Web.Endpoint,
   secret_key_base: &quot;&lt;the secret generated by pleroma_ctl&gt;&quot;,
   signing_salt: &quot;&lt;the secret generated by pleroma_ctl&gt;&quot;

config :pleroma, Pleroma.Repo,
  password: &quot;&lt;the secret generated by pleroma_ctl&gt;&quot;

# Configure web push notifications
config :web_push_encryption, :vapid_details,
  public_key: &quot;&lt;the secret generated by pleroma_ctl&gt;&quot;,
  private_key: &quot;&lt;the secret generated by pleroma_ctl&gt;&quot;

# ... TO CONTINUE ...
</programlisting>
    <para>
      Note that the lines of the same configuration group are comma
      separated (i.e. all the lines end with a comma, except the last
      one), so when the lines with passwords are added or removed,
      commas must be adjusted accordingly.
    </para>
    <para>
      The service can be enabled with the usual
    </para>
    <programlisting>
$ nixos-rebuild switch
</programlisting>
    <para>
      The service is accessible only from the local
      <literal>127.0.0.1:4000</literal> port. It can be tested using a
      port forwarding like this
    </para>
    <programlisting>
$ ssh -L 4000:localhost:4000 myuser@example.net
</programlisting>
    <para>
      and then accessing
      <link xlink:href="http://localhost:4000">http://localhost:4000</link>
      from a web browser.
    </para>
  </section>
  <section xml:id="module-services-pleroma-admin-user">
    <title>Creating the admin user</title>
    <para>
      After Pleroma service is running, all
      <link xlink:href="https://docs-develop.pleroma.social/">Pleroma
      administration utilities</link> can be used. In particular an
      admin user can be created with
    </para>
    <programlisting>
$ pleroma_ctl user new &lt;nickname&gt; &lt;email&gt;  --admin --moderator --password &lt;password&gt;
</programlisting>
  </section>
  <section xml:id="module-services-pleroma-nginx">
    <title>Configuring Nginx</title>
    <para>
      In this configuration, Pleroma is listening only on the local port
      4000. Nginx can be configured as a Reverse Proxy, for forwarding
      requests from public ports to the Pleroma service. This is an
      example of configuration, using
      <link xlink:href="https://letsencrypt.org/">Let’s Encrypt</link>
      for the TLS certificates
    </para>
    <programlisting>
security.acme = {
  email = &quot;root@example.net&quot;;
  acceptTerms = true;
};

services.nginx = {
  enable = true;
  addSSL = true;

  recommendedTlsSettings = true;
  recommendedOptimisation = true;
  recommendedGzipSettings = true;

  recommendedProxySettings = false;
  # NOTE: if enabled, the NixOS proxy optimizations will override the Pleroma
  # specific settings, and they will enter in conflict.

  virtualHosts = {
    &quot;pleroma.example.net&quot; = {
      http2 = true;
      enableACME = true;
      forceSSL = true;

      locations.&quot;/&quot; = {
        proxyPass = &quot;http://127.0.0.1:4000&quot;;

        extraConfig = ''
          etag on;
          gzip on;

          add_header 'Access-Control-Allow-Origin' '*' always;
          add_header 'Access-Control-Allow-Methods' 'POST, PUT, DELETE, GET, PATCH, OPTIONS' always;
          add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type, Idempotency-Key' always;
          add_header 'Access-Control-Expose-Headers' 'Link, X-RateLimit-Reset, X-RateLimit-Limit, X-RateLimit-Remaining, X-Request-Id' always;
          if ($request_method = OPTIONS) {
            return 204;
          }
          add_header X-XSS-Protection &quot;1; mode=block&quot;;
          add_header X-Permitted-Cross-Domain-Policies none;
          add_header X-Frame-Options DENY;
          add_header X-Content-Type-Options nosniff;
          add_header Referrer-Policy same-origin;
          add_header X-Download-Options noopen;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection &quot;upgrade&quot;;
          proxy_set_header Host $host;

          client_max_body_size 16m;
          # NOTE: increase if users need to upload very big files
        '';
      };
    };
  };
};
</programlisting>
  </section>
</chapter>