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+======= Installing Mastodon from source on Debian 11 Bullseye =======
+Instructional guide on creating your own [[https://joinmastodon.org/|Mastodon]]-powered website, based on the official Ubuntu setup guide of Mastodon ((https://docs.joinmastodon.org/admin/install/)) that won't work for Debian 11 (Bullseye) for a number of reasons ((https://discourse.joinmastodon.org/t/yarn-error-no-such-option-pure-lockfile/2431/5))((https://github.com/mastodon/mastodon/issues/16726#issuecomment-917379596))((https://github.com/mastodon/mastodon/commit/8af7f3b063a9d082b95e087bc7bf6feac7d13631)).
+Using this guide and copy & pasting the commands should give you a working Mastodon instance in less than 60 minutes.
+===== Pre-requisites =====
+  * A machine running Debian 11, e.g. from a new netinstall image that you have root access to
+  * A domain name (or a subdomain) for the Mastodon server, e.g. `example.com`
+  * An e-mail delivery service set up
+You will be running the commands as root. If you aren’t already root, switch to root:
+==== System packages ====
+  apt update
+  apt install -y  \
+  imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git-core
+  g++ libprotobuf-dev protobuf-compiler pkg-config nodejs gcc autoconf
+  bison build-essential libssl-dev libyaml-dev libreadline6-dev
+  zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev curl sudo
+  nginx redis-server redis-tools postgresql postgresql-contrib
+  certbot python3-certbot-nginx yarn libidn11-dev libicu-dev libjemalloc-dev
+==== System repositories ====
+=== Node.js ===
+  curl -sL https://deb.nodesource.com/setup_12.x | bash -
+  apt-get install -y nodejs=12*
+=== Yarn ===
+  curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+  echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+  apt-get update && apt-get install -y yarn
+==== Installing Ruby ====
+We will be using rbenv to manage Ruby versions, because it’s easier to get the right versions and to update once a newer release comes out. rbenv must be installed for a single Linux user, therefore, first we must create the user Mastodon will be running as:
+  adduser --disabled-login mastodon
+We can then switch to the user:
+  su - mastodon
+And proceed to install rbenv and rbenv-build:
+  git clone https://github.com/rbenv/rbenv.git ~/.rbenv
+  cd ~/.rbenv && src/configure && make -C src
+  echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
+  echo 'eval "$(rbenv init -)"' >> ~/.bashrc
+  exec bash
+  git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
+Once this is done, we can install the correct Ruby version:
+  RUBY_CONFIGURE_OPTS=--with-jemalloc rbenv install 2.7.2
+  rbenv global 2.7.2
+We’ll also need to install bundler:
+  gem install bundler --no-document
+Return to the root user:
+  exit
+===== Setup =====
+==== Setting up PostgreSQL ====
+Performance configuration (optional)
+For optimal performance, you may use pgTune to generate an appropriate configuration and edit values in /etc/postgresql/9.6/main/postgresql.conf before restarting PostgreSQL with systemctl restart postgresql
+=== Creating a user ===
+You will need to create a PostgreSQL user that Mastodon could use. It is easiest to go with “ident” authentication in a simple setup, i.e. the PostgreSQL user does not have a separate password and can be used by the Linux user with the same username.
+Open the prompt:
+  sudo -u postgres psql
+In the prompt, execute:
+  CREATE USER mastodon CREATEDB;  \\
+  \q
+Done!
+==== Setting up Mastodon ====
+It is time to download the Mastodon code. Switch to the mastodon user:
+  su - mastodon
+=== Checking out the code ===
+Use git to download the latest stable release of Mastodon:
+  git clone https://github.com/tootsuite/mastodon.git live && cd live
+  git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)
+=== Installing the last dependencies ===
+Now to install Ruby and JavaScript dependencies:
+  bundle config deployment 'true'
+  bundle config without 'development test'
+  bundle install -j$(getconf _NPROCESSORS_ONLN)
+  yarn install --pure-lockfile
+//The two bundle config commands are only needed the first time you're installing dependencies. If you're going to be updating or re-installing dependencies later, just **bundle install** will be enough.//
+=== Generating a configuration ===
+Run the interactive setup wizard:
+  LD_PRELOAD=libjemalloc.so RAILS_ENV=production bundle exec rake mastodon:setup
+This will:
+  * Ask you a number of questions and create a configuration file
+  * Run asset precompilation
+  * Create the database schema
+  * Create an admin user and random password
+If you're going to use Mastodons' single-user mode, you can choose your final handle (which will later display as //"example.com/@handle"// for the admin account instead of the pre-selected //admin// handle.
+The configuration file is saved as
+  .env.production
+You can review and edit it to your liking. Refer to [[https://docs.joinmastodon.org/admin/config/|Mastodons' documentation on configuration]].
+You’re done with the mastodon user for now, so switch back to root:
+  exit
+==== Setting up nginx ====
+Copy the configuration template for nginx from the Mastodon directory:
+  cp /home/mastodon/live/dist/nginx.conf /etc/nginx/sites-available/mastodon  \\
+  ln -s /etc/nginx/sites-available/mastodon /etc/nginx/sites-enabled/mastodon
+Then edit /etc/nginx/sites-available/mastodon to replace example.com with your own domain name. If you're using VIM you can do that like so:
+  :%s/example.com/mydomain.com/g
+Make any other adjustments you might need.
+=== Acquiring a SSL certificate ===
+We’ll use Let’s Encrypt to get a free SSL certificate:
+  certbot --nginx -d example.com
+This will obtain the certificate, automatically update /etc/nginx/sites-available/mastodon to use the new certificate, and reload nginx for the changes to take effect.
+At this point you should be able to visit your domain in the browser and see the elephant hitting the computer screen error page. This is because we haven’t started the Mastodon process yet.
+==== Setting up systemd services ====
+=== Copy the systemd service templates from the Mastodon directory ===
+  cp /home/mastodon/live/dist/mastodon-*.service /etc/systemd/system/
+=== Change /etc/systemd/system/mastodon-sidekiq.service to preload libjemalloc.so ===
+  $EDITOR /etc/systemd/system/mastodon-sidekiq.service
+Below the line containing
+  Environment="MALLOC_ARENA_MAX=2"
+enter
+  Environment="LD_PRELOAD=libjemalloc.so"
+=== Change /etc/systemd/system/mastodon-web.service to preload libjemalloc.so ===
+  $EDITOR /etc/systemd/system/mastodon-web.service
+Below the line containing
+  Environment="PORT=3000"
+enter
+  Environment="LD_PRELOAD=libjemalloc.so"
+=== If you deviated from the defaults at any point, check that the username and paths are correct ===
+  $EDITOR /etc/systemd/system/mastodon-*.service
+=== Start and enable the new systemd services ===
+  systemctl daemon-reload  \\
+  systemctl enable --now mastodon-web mastodon-sidekiq mastodon-streaming
+They will now automatically start at boot.
+==== Hooray! You should now have a working Mastodon server ====
+===== To Investigate =====
+==== yarn install --pure-lockfile yields a warning ====
+  warning " > react-redux-loading-bar@4.0.8" has incorrect peer dependency "react-redux@^3.0.0 || ^4.0.0 || ^5.0.0".
+It doesn't seem to have an impact, though.
+===== External links =====
+  * [[https://docs.joinmastodon.org/admin/install/|Official Mastodon installation instructions this Wiki article is based on]]
+  * [[https://neilzone.co.uk/2022/02/migrating-mastodon-to-debian-11-bullseye-fixing-the-segfault|Migrating mastodon to Debian 11 Bullseye: fixing the segfault]]
+===== License, Source =====
+This article is based on https://docs.joinmastodon.org/admin/install/ by https://joinmastodon.org/ and is licensed under [[https://creativecommons.org/licenses/by-sa/4.0/|CC BY-SA 4.0]].