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- <h1 id="installation-instructions"><a class="header" href="#installation-instructions">Installation Instructions</a></h1>
-<h2 id="choosing-your-server-name"><a class="header" href="#choosing-your-server-name">Choosing your server name</a></h2>
-<p>It is important to choose the name for your server before you install Synapse,
-because it cannot be changed later.</p>
-<p>The server name determines the "domain" part of user-ids for users on your
-server: these will all be of the format <code>@user:my.domain.name</code>. It also
-determines how other matrix servers will reach yours for federation.</p>
-<p>For a test configuration, set this to the hostname of your server. For a more
-production-ready setup, you will probably want to specify your domain
-(<code>example.com</code>) rather than a matrix-specific hostname here (in the same way
-that your email address is probably <code>user@example.com</code> rather than
-<code>user@email.example.com</code>) - but doing so may require more advanced setup: see
-<a href="../federate.html">Setting up Federation</a>.</p>
-<h2 id="installing-synapse"><a class="header" href="#installing-synapse">Installing Synapse</a></h2>
-<h3 id="prebuilt-packages"><a class="header" href="#prebuilt-packages">Prebuilt packages</a></h3>
-<p>Prebuilt packages are available for a number of platforms. These are recommended
-for most users.</p>
-<h4 id="docker-images-and-ansible-playbooks"><a class="header" href="#docker-images-and-ansible-playbooks">Docker images and Ansible playbooks</a></h4>
-<p>There is an official synapse image available at
-<a href="https://hub.docker.com/r/matrixdotorg/synapse">https://hub.docker.com/r/matrixdotorg/synapse</a> which can be used with
-the docker-compose file available at
-<a href="https://github.com/matrix-org/synapse/tree/develop/contrib/docker">contrib/docker</a>.
-Further information on this including configuration options is available in the README
-on hub.docker.com.</p>
-<p>Alternatively, Andreas Peters (previously Silvio Fricke) has contributed a
-Dockerfile to automate a synapse server in a single Docker image, at
-<a href="https://hub.docker.com/r/avhost/docker-matrix/tags/">https://hub.docker.com/r/avhost/docker-matrix/tags/</a></p>
-<p>Slavi Pantaleev has created an Ansible playbook,
-which installs the offical Docker image of Matrix Synapse
-along with many other Matrix-related services (Postgres database, Element, coturn,
-ma1sd, SSL support, etc.).
-For more details, see
-<a href="https://github.com/spantaleev/matrix-docker-ansible-deploy">https://github.com/spantaleev/matrix-docker-ansible-deploy</a></p>
-<h4 id="debianubuntu"><a class="header" href="#debianubuntu">Debian/Ubuntu</a></h4>
-<h5 id="matrixorg-packages"><a class="header" href="#matrixorg-packages">Matrix.org packages</a></h5>
-<p>Matrix.org provides Debian/Ubuntu packages of Synapse, for the amd64
-architecture via <a href="https://packages.matrix.org/debian/">https://packages.matrix.org/debian/</a>.</p>
-<p>To install the latest release:</p>
-<pre><code class="language-sh">sudo apt install -y lsb-release wget apt-transport-https
-sudo wget -O /usr/share/keyrings/matrix-org-archive-keyring.gpg https://packages.matrix.org/debian/matrix-org-archive-keyring.gpg
-echo "deb [signed-by=/usr/share/keyrings/matrix-org-archive-keyring.gpg] https://packages.matrix.org/debian/ $(lsb_release -cs) main" |
- sudo tee /etc/apt/sources.list.d/matrix-org.list
-sudo apt update
-sudo apt install matrix-synapse-py3
-</code></pre>
-<p>Packages are also published for release candidates. To enable the prerelease
-channel, add <code>prerelease</code> to the <code>sources.list</code> line. For example:</p>
-<pre><code class="language-sh">sudo wget -O /usr/share/keyrings/matrix-org-archive-keyring.gpg https://packages.matrix.org/debian/matrix-org-archive-keyring.gpg
-echo "deb [signed-by=/usr/share/keyrings/matrix-org-archive-keyring.gpg] https://packages.matrix.org/debian/ $(lsb_release -cs) main prerelease" |
- sudo tee /etc/apt/sources.list.d/matrix-org.list
-sudo apt update
-sudo apt install matrix-synapse-py3
-</code></pre>
-<p>The fingerprint of the repository signing key (as shown by <code>gpg /usr/share/keyrings/matrix-org-archive-keyring.gpg</code>) is
-<code>AAF9AE843A7584B5A3E4CD2BCF45A512DE2DA058</code>.</p>
-<h5 id="downstream-debian-packages"><a class="header" href="#downstream-debian-packages">Downstream Debian packages</a></h5>
-<p>We do not recommend using the packages from the default Debian <code>buster</code>
-repository at this time, as they are old and suffer from known security
-vulnerabilities. You can install the latest version of Synapse from
-<a href="#matrixorg-packages">our repository</a> or from <code>buster-backports</code>. Please
-see the <a href="https://backports.debian.org/Instructions/">Debian documentation</a>
-for information on how to use backports.</p>
-<p>If you are using Debian <code>sid</code> or testing, Synapse is available in the default
-repositories and it should be possible to install it simply with:</p>
-<pre><code class="language-sh">sudo apt install matrix-synapse
-</code></pre>
-<h5 id="downstream-ubuntu-packages"><a class="header" href="#downstream-ubuntu-packages">Downstream Ubuntu packages</a></h5>
-<p>We do not recommend using the packages in the default Ubuntu repository
-at this time, as they are old and suffer from known security vulnerabilities.
-The latest version of Synapse can be installed from <a href="#matrixorg-packages">our repository</a>.</p>
-<h4 id="fedora"><a class="header" href="#fedora">Fedora</a></h4>
-<p>Synapse is in the Fedora repositories as <code>matrix-synapse</code>:</p>
-<pre><code class="language-sh">sudo dnf install matrix-synapse
-</code></pre>
-<p>Oleg Girko provides Fedora RPMs at
-<a href="https://obs.infoserver.lv/project/monitor/matrix-synapse">https://obs.infoserver.lv/project/monitor/matrix-synapse</a></p>
-<h4 id="opensuse"><a class="header" href="#opensuse">OpenSUSE</a></h4>
-<p>Synapse is in the OpenSUSE repositories as <code>matrix-synapse</code>:</p>
-<pre><code class="language-sh">sudo zypper install matrix-synapse
-</code></pre>
-<h4 id="suse-linux-enterprise-server"><a class="header" href="#suse-linux-enterprise-server">SUSE Linux Enterprise Server</a></h4>
-<p>Unofficial package are built for SLES 15 in the openSUSE:Backports:SLE-15 repository at
-<a href="https://download.opensuse.org/repositories/openSUSE:/Backports:/SLE-15/standard/">https://download.opensuse.org/repositories/openSUSE:/Backports:/SLE-15/standard/</a></p>
-<h4 id="archlinux"><a class="header" href="#archlinux">ArchLinux</a></h4>
-<p>The quickest way to get up and running with ArchLinux is probably with the community package
-<a href="https://www.archlinux.org/packages/community/any/matrix-synapse/">https://www.archlinux.org/packages/community/any/matrix-synapse/</a>, which should pull in most of
-the necessary dependencies.</p>
-<p>pip may be outdated (6.0.7-1 and needs to be upgraded to 6.0.8-1 ):</p>
-<pre><code class="language-sh">sudo pip install --upgrade pip
-</code></pre>
-<p>If you encounter an error with lib bcrypt causing an Wrong ELF Class:
-ELFCLASS32 (x64 Systems), you may need to reinstall py-bcrypt to correctly
-compile it under the right architecture. (This should not be needed if
-installing under virtualenv):</p>
-<pre><code class="language-sh">sudo pip uninstall py-bcrypt
-sudo pip install py-bcrypt
-</code></pre>
-<h4 id="void-linux"><a class="header" href="#void-linux">Void Linux</a></h4>
-<p>Synapse can be found in the void repositories as 'synapse':</p>
-<pre><code class="language-sh">xbps-install -Su
-xbps-install -S synapse
-</code></pre>
-<h4 id="freebsd"><a class="header" href="#freebsd">FreeBSD</a></h4>
-<p>Synapse can be installed via FreeBSD Ports or Packages contributed by Brendan Molloy from:</p>
-<ul>
-<li>Ports: <code>cd /usr/ports/net-im/py-matrix-synapse && make install clean</code></li>
-<li>Packages: <code>pkg install py37-matrix-synapse</code></li>
-</ul>
-<h4 id="openbsd"><a class="header" href="#openbsd">OpenBSD</a></h4>
-<p>As of OpenBSD 6.7 Synapse is available as a pre-compiled binary. The filesystem
-underlying the homeserver directory (defaults to <code>/var/synapse</code>) has to be
-mounted with <code>wxallowed</code> (cf. <code>mount(8)</code>), so creating a separate filesystem
-and mounting it to <code>/var/synapse</code> should be taken into consideration.</p>
-<p>Installing Synapse:</p>
-<pre><code class="language-sh">doas pkg_add synapse
-</code></pre>
-<h4 id="nixos"><a class="header" href="#nixos">NixOS</a></h4>
-<p>Robin Lambertz has packaged Synapse for NixOS at:
-<a href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/misc/matrix-synapse.nix">https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/misc/matrix-synapse.nix</a></p>
-<h3 id="installing-as-a-python-module-from-pypi"><a class="header" href="#installing-as-a-python-module-from-pypi">Installing as a Python module from PyPI</a></h3>
-<p>It's also possible to install Synapse as a Python module from PyPI.</p>
-<p>When following this route please make sure that the <a href="#platform-specific-prerequisites">Platform-specific prerequisites</a> are already installed.</p>
-<p>System requirements:</p>
-<ul>
-<li>POSIX-compliant system (tested on Linux & OS X)</li>
-<li>Python 3.6 or later, up to Python 3.9.</li>
-<li>At least 1GB of free RAM if you want to join large public rooms like #matrix:matrix.org</li>
-</ul>
-<p>To install the Synapse homeserver run:</p>
-<pre><code class="language-sh">mkdir -p ~/synapse
-virtualenv -p python3 ~/synapse/env
-source ~/synapse/env/bin/activate
-pip install --upgrade pip
-pip install --upgrade setuptools
-pip install matrix-synapse
-</code></pre>
-<p>This will download Synapse from <a href="https://pypi.org/project/matrix-synapse">PyPI</a>
-and install it, along with the python libraries it uses, into a virtual environment
-under <code>~/synapse/env</code>. Feel free to pick a different directory if you
-prefer.</p>
-<p>This Synapse installation can then be later upgraded by using pip again with the
-update flag:</p>
-<pre><code class="language-sh">source ~/synapse/env/bin/activate
-pip install -U matrix-synapse
-</code></pre>
-<p>Before you can start Synapse, you will need to generate a configuration
-file. To do this, run (in your virtualenv, as before):</p>
-<pre><code class="language-sh">cd ~/synapse
-python -m synapse.app.homeserver \
- --server-name my.domain.name \
- --config-path homeserver.yaml \
- --generate-config \
- --report-stats=[yes|no]
-</code></pre>
-<p>... substituting an appropriate value for <code>--server-name</code>.</p>
-<p>This command will generate you a config file that you can then customise, but it will
-also generate a set of keys for you. These keys will allow your homeserver to
-identify itself to other homeserver, so don't lose or delete them. It would be
-wise to back them up somewhere safe. (If, for whatever reason, you do need to
-change your homeserver's keys, you may find that other homeserver have the
-old key cached. If you update the signing key, you should change the name of the
-key in the <code><server name>.signing.key</code> file (the second word) to something
-different. See the <a href="https://matrix.org/docs/spec/server_server/latest.html#retrieving-server-keys">spec</a> for more information on key management).</p>
-<p>To actually run your new homeserver, pick a working directory for Synapse to
-run (e.g. <code>~/synapse</code>), and:</p>
-<pre><code class="language-sh">cd ~/synapse
-source env/bin/activate
-synctl start
-</code></pre>
-<h4 id="platform-specific-prerequisites"><a class="header" href="#platform-specific-prerequisites">Platform-specific prerequisites</a></h4>
-<p>Synapse is written in Python but some of the libraries it uses are written in
-C. So before we can install Synapse itself we need a working C compiler and the
-header files for Python C extensions.</p>
-<h5 id="debianubunturaspbian"><a class="header" href="#debianubunturaspbian">Debian/Ubuntu/Raspbian</a></h5>
-<p>Installing prerequisites on Ubuntu or Debian:</p>
-<pre><code class="language-sh">sudo apt install build-essential python3-dev libffi-dev \
- python3-pip python3-setuptools sqlite3 \
- libssl-dev virtualenv libjpeg-dev libxslt1-dev
-</code></pre>
-<h5 id="archlinux-1"><a class="header" href="#archlinux-1">ArchLinux</a></h5>
-<p>Installing prerequisites on ArchLinux:</p>
-<pre><code class="language-sh">sudo pacman -S base-devel python python-pip \
- python-setuptools python-virtualenv sqlite3
-</code></pre>
-<h5 id="centosfedora"><a class="header" href="#centosfedora">CentOS/Fedora</a></h5>
-<p>Installing prerequisites on CentOS or Fedora Linux:</p>
-<pre><code class="language-sh">sudo dnf install libtiff-devel libjpeg-devel libzip-devel freetype-devel \
- libwebp-devel libxml2-devel libxslt-devel libpq-devel \
- python3-virtualenv libffi-devel openssl-devel python3-devel
-sudo dnf groupinstall "Development Tools"
-</code></pre>
-<h5 id="macos"><a class="header" href="#macos">macOS</a></h5>
-<p>Installing prerequisites on macOS:</p>
-<p>You may need to install the latest Xcode developer tools:</p>
-<pre><code class="language-sh">xcode-select --install
-</code></pre>
-<p>On ARM-based Macs you may need to explicitly install libjpeg which is a pillow dependency. You can use Homebrew (https://brew.sh):</p>
-<pre><code class="language-sh"> brew install jpeg
-</code></pre>
-<p>On macOS Catalina (10.15) you may need to explicitly install OpenSSL
-via brew and inform <code>pip</code> about it so that <code>psycopg2</code> builds:</p>
-<pre><code class="language-sh">brew install openssl@1.1
-export LDFLAGS="-L/usr/local/opt/openssl/lib"
-export CPPFLAGS="-I/usr/local/opt/openssl/include"
-</code></pre>
-<h5 id="opensuse-1"><a class="header" href="#opensuse-1">OpenSUSE</a></h5>
-<p>Installing prerequisites on openSUSE:</p>
-<pre><code class="language-sh">sudo zypper in -t pattern devel_basis
-sudo zypper in python-pip python-setuptools sqlite3 python-virtualenv \
- python-devel libffi-devel libopenssl-devel libjpeg62-devel
-</code></pre>
-<h5 id="openbsd-1"><a class="header" href="#openbsd-1">OpenBSD</a></h5>
-<p>A port of Synapse is available under <code>net/synapse</code>. The filesystem
-underlying the homeserver directory (defaults to <code>/var/synapse</code>) has to be
-mounted with <code>wxallowed</code> (cf. <code>mount(8)</code>), so creating a separate filesystem
-and mounting it to <code>/var/synapse</code> should be taken into consideration.</p>
-<p>To be able to build Synapse's dependency on python the <code>WRKOBJDIR</code>
-(cf. <code>bsd.port.mk(5)</code>) for building python, too, needs to be on a filesystem
-mounted with <code>wxallowed</code> (cf. <code>mount(8)</code>).</p>
-<p>Creating a <code>WRKOBJDIR</code> for building python under <code>/usr/local</code> (which on a
-default OpenBSD installation is mounted with <code>wxallowed</code>):</p>
-<pre><code class="language-sh">doas mkdir /usr/local/pobj_wxallowed
-</code></pre>
-<p>Assuming <code>PORTS_PRIVSEP=Yes</code> (cf. <code>bsd.port.mk(5)</code>) and <code>SUDO=doas</code> are
-configured in <code>/etc/mk.conf</code>:</p>
-<pre><code class="language-sh">doas chown _pbuild:_pbuild /usr/local/pobj_wxallowed
-</code></pre>
-<p>Setting the <code>WRKOBJDIR</code> for building python:</p>
-<pre><code class="language-sh">echo WRKOBJDIR_lang/python/3.7=/usr/local/pobj_wxallowed \\nWRKOBJDIR_lang/python/2.7=/usr/local/pobj_wxallowed >> /etc/mk.conf
-</code></pre>
-<p>Building Synapse:</p>
-<pre><code class="language-sh">cd /usr/ports/net/synapse
-make install
-</code></pre>
-<h5 id="windows"><a class="header" href="#windows">Windows</a></h5>
-<p>If you wish to run or develop Synapse on Windows, the Windows Subsystem For
-Linux provides a Linux environment on Windows 10 which is capable of using the
-Debian, Fedora, or source installation methods. More information about WSL can
-be found at <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">https://docs.microsoft.com/en-us/windows/wsl/install-win10</a> for
-Windows 10 and <a href="https://docs.microsoft.com/en-us/windows/wsl/install-on-server">https://docs.microsoft.com/en-us/windows/wsl/install-on-server</a>
-for Windows Server.</p>
-<h2 id="setting-up-synapse"><a class="header" href="#setting-up-synapse">Setting up Synapse</a></h2>
-<p>Once you have installed synapse as above, you will need to configure it.</p>
-<h3 id="using-postgresql"><a class="header" href="#using-postgresql">Using PostgreSQL</a></h3>
-<p>By default Synapse uses an <a href="https://sqlite.org/">SQLite</a> database and in doing so trades
-performance for convenience. Almost all installations should opt to use <a href="https://www.postgresql.org">PostgreSQL</a>
-instead. Advantages include:</p>
-<ul>
-<li>significant performance improvements due to the superior threading and
-caching model, smarter query optimiser</li>
-<li>allowing the DB to be run on separate hardware</li>
-</ul>
-<p>For information on how to install and use PostgreSQL in Synapse, please see
-<a href="../postgres.html">Using Postgres</a></p>
-<p>SQLite is only acceptable for testing purposes. SQLite should not be used in
-a production server. Synapse will perform poorly when using
-SQLite, especially when participating in large rooms.</p>
-<h3 id="tls-certificates"><a class="header" href="#tls-certificates">TLS certificates</a></h3>
-<p>The default configuration exposes a single HTTP port on the local
-interface: <code>http://localhost:8008</code>. It is suitable for local testing,
-but for any practical use, you will need Synapse's APIs to be served
-over HTTPS.</p>
-<p>The recommended way to do so is to set up a reverse proxy on port
-<code>8448</code>. You can find documentation on doing so in
-<a href="../reverse_proxy.html">the reverse proxy documentation</a>.</p>
-<p>Alternatively, you can configure Synapse to expose an HTTPS port. To do
-so, you will need to edit <code>homeserver.yaml</code>, as follows:</p>
-<ul>
-<li>First, under the <code>listeners</code> section, uncomment the configuration for the
-TLS-enabled listener. (Remove the hash sign (<code>#</code>) at the start of
-each line). The relevant lines are like this:</li>
-</ul>
-<pre><code class="language-yaml"> - port: 8448
- type: http
- tls: true
- resources:
- - names: [client, federation]
-</code></pre>
-<ul>
-<li>
-<p>You will also need to uncomment the <code>tls_certificate_path</code> and
-<code>tls_private_key_path</code> lines under the <code>TLS</code> section. You will need to manage
-provisioning of these certificates yourself.</p>
-<p>If you are using your own certificate, be sure to use a <code>.pem</code> file that
-includes the full certificate chain including any intermediate certificates
-(for instance, if using certbot, use <code>fullchain.pem</code> as your certificate, not
-<code>cert.pem</code>).</p>
-</li>
-</ul>
-<p>For a more detailed guide to configuring your server for federation, see
-<a href="../federate.html">Federation</a>.</p>
-<h3 id="client-well-known-uri"><a class="header" href="#client-well-known-uri">Client Well-Known URI</a></h3>
-<p>Setting up the client Well-Known URI is optional but if you set it up, it will
-allow users to enter their full username (e.g. <code>@user:<server_name></code>) into clients
-which support well-known lookup to automatically configure the homeserver and
-identity server URLs. This is useful so that users don't have to memorize or think
-about the actual homeserver URL you are using.</p>
-<p>The URL <code>https://<server_name>/.well-known/matrix/client</code> should return JSON in
-the following format.</p>
-<pre><code class="language-json">{
- "m.homeserver": {
- "base_url": "https://<matrix.example.com>"
- }
-}
-</code></pre>
-<p>It can optionally contain identity server information as well.</p>
-<pre><code class="language-json">{
- "m.homeserver": {
- "base_url": "https://<matrix.example.com>"
- },
- "m.identity_server": {
- "base_url": "https://<identity.example.com>"
- }
-}
-</code></pre>
-<p>To work in browser based clients, the file must be served with the appropriate
-Cross-Origin Resource Sharing (CORS) headers. A recommended value would be
-<code>Access-Control-Allow-Origin: *</code> which would allow all browser based clients to
-view it.</p>
-<p>In nginx this would be something like:</p>
-<pre><code class="language-nginx">location /.well-known/matrix/client {
- return 200 '{"m.homeserver": {"base_url": "https://<matrix.example.com>"}}';
- default_type application/json;
- add_header Access-Control-Allow-Origin *;
-}
-</code></pre>
-<p>You should also ensure the <code>public_baseurl</code> option in <code>homeserver.yaml</code> is set
-correctly. <code>public_baseurl</code> should be set to the URL that clients will use to
-connect to your server. This is the same URL you put for the <code>m.homeserver</code>
-<code>base_url</code> above.</p>
-<pre><code class="language-yaml">public_baseurl: "https://<matrix.example.com>"
-</code></pre>
-<h3 id="email"><a class="header" href="#email">Email</a></h3>
-<p>It is desirable for Synapse to have the capability to send email. This allows
-Synapse to send password reset emails, send verifications when an email address
-is added to a user's account, and send email notifications to users when they
-receive new messages.</p>
-<p>To configure an SMTP server for Synapse, modify the configuration section
-headed <code>email</code>, and be sure to have at least the <code>smtp_host</code>, <code>smtp_port</code>
-and <code>notif_from</code> fields filled out. You may also need to set <code>smtp_user</code>,
-<code>smtp_pass</code>, and <code>require_transport_security</code>.</p>
-<p>If email is not configured, password reset, registration and notifications via
-email will be disabled.</p>
-<h3 id="registering-a-user"><a class="header" href="#registering-a-user">Registering a user</a></h3>
-<p>The easiest way to create a new user is to do so from a client like <a href="https://element.io/">Element</a>.</p>
-<p>Alternatively, you can do so from the command line. This can be done as follows:</p>
-<ol>
-<li>If synapse was installed via pip, activate the virtualenv as follows (if Synapse was
-installed via a prebuilt package, <code>register_new_matrix_user</code> should already be
-on the search path):
-<pre><code class="language-sh">cd ~/synapse
-source env/bin/activate
-synctl start # if not already running
-</code></pre>
-</li>
-<li>Run the following command:
-<pre><code class="language-sh">register_new_matrix_user -c homeserver.yaml http://localhost:8008
-</code></pre>
-</li>
-</ol>
-<p>This will prompt you to add details for the new user, and will then connect to
-the running Synapse to create the new user. For example:</p>
-<pre><code>New user localpart: erikj
-Password:
-Confirm password:
-Make admin [no]:
-Success!
-</code></pre>
-<p>This process uses a setting <code>registration_shared_secret</code> in
-<code>homeserver.yaml</code>, which is shared between Synapse itself and the
-<code>register_new_matrix_user</code> script. It doesn't matter what it is (a random
-value is generated by <code>--generate-config</code>), but it should be kept secret, as
-anyone with knowledge of it can register users, including admin accounts,
-on your server even if <code>enable_registration</code> is <code>false</code>.</p>
-<h3 id="setting-up-a-turn-server"><a class="header" href="#setting-up-a-turn-server">Setting up a TURN server</a></h3>
-<p>For reliable VoIP calls to be routed via this homeserver, you MUST configure
-a TURN server. See <a href="../turn-howto.html">TURN setup</a> for details.</p>
-<h3 id="url-previews"><a class="header" href="#url-previews">URL previews</a></h3>
-<p>Synapse includes support for previewing URLs, which is disabled by default. To
-turn it on you must enable the <code>url_preview_enabled: True</code> config parameter
-and explicitly specify the IP ranges that Synapse is not allowed to spider for
-previewing in the <code>url_preview_ip_range_blacklist</code> configuration parameter.
-This is critical from a security perspective to stop arbitrary Matrix users
-spidering 'internal' URLs on your network. At the very least we recommend that
-your loopback and RFC1918 IP addresses are blacklisted.</p>
-<p>This also requires the optional <code>lxml</code> python dependency to be installed. This
-in turn requires the <code>libxml2</code> library to be available - on Debian/Ubuntu this
-means <code>apt-get install libxml2-dev</code>, or equivalent for your OS.</p>
-<h3 id="troubleshooting-installation"><a class="header" href="#troubleshooting-installation">Troubleshooting Installation</a></h3>
-<p><code>pip</code> seems to leak <em>lots</em> of memory during installation. For instance, a Linux
-host with 512MB of RAM may run out of memory whilst installing Twisted. If this
-happens, you will have to individually install the dependencies which are
-failing, e.g.:</p>
-<pre><code class="language-sh">pip install twisted
-</code></pre>
-<p>If you have any other problems, feel free to ask in
-<a href="https://matrix.to/#/#synapse:matrix.org">#synapse:matrix.org</a>.</p>
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