Enable EPEL is a good idea

dnf config-manager --set-enabled powertools
dnf install epel-release

Get the YARN repo

curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo

Installing the needed packages

yum install -y git ruby ruby-devel postgresql-devel postgresql-server postgresql \
 postgresql-contrib nodejs.x86_64 yarn make idn2.x86_64 libidn-devel.x86_64 \
 libidn2-devel.x86_64 libidn.x86_64  libicu-devel.x86_64 libicu.x86_64 gcc gcc-c++ \
 libzstd-devel openssl-devel tar redis nginx certbot.noarch \
 python3-certbot-nginx.noarch ImageMagick.x86_64 libicu-devel.x86_64 postgresql-contrib.x86_64 \
 libffi-devel.x86_64 libyaml.x86_64 autoconf.noarch protobuf.x86_64 \
 libxml2-devel.x86_64 bison.x86_64 libpq-devel.x86_64 jemalloc-devel rbenv

Add the user and change the home-dir

adduser mastodon
mv /home/mastodon /opt
usermod -d /opt/mastodon mastodon

Start redis

systemctl enable --now redis

systemctl start postgresql.service
/usr/bin/postgresql-setup --initdb --unit postgresql
sudo -u postgres psql

CREATE USER mastodon CREATEDB;
\q

su - mastodon

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)

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

Run the interactive setup wizard:

RAILS_ENV=production bundle exec rake mastodon:setup

Copy the prepared nginx.conf into the nginxc config-dir. Change the hostname and the root-dir.

cp /opt/mastodon/live/dist/nginx.conf /etc/nginx/conf.d/mastodon.conf
sed -i 's:/home/mastodon/live/public;:/opt/mastodon/live/public;:g' /etc/nginx/conf.d/mastodon.conf
sed -i 's/example.com/social.server17.net/g' /etc/nginx/conf.d/mastodon.conf

Ensure that the firewall is configured for http and https

firewall-cmd --add-service=http --permanent 
firewall-cmd --add-service=https --permanent 
firewall-cmd --reload

Get a certifcate for your host/hostname

certbot --nginx -d social.server17.net

copy the files

cp /opt/mastodon/live/dist/mastodon-*.service /etc/systemd/system/

and edit the files

sed -i 's:/home/mastodon/:/opt/mastodon/:g' /etc/systemd/system/mastodon-*
sed -i 's:/opt/mastodon/.rbenv/shims/bundle:/opt/mastodon/live/bin/bundle:g' /etc/systemd/system/mastodon-*

now relaod the systemd and start evertything

systemctl daemon-reload
systemctl enable --now mastodon-web mastodon-sidekiq mastodon-streaming

Maybe something went wrong with the install of the bundler gem and the services are not starting. Check if the gem is installed or just install it.

# su - mastodon
cd live/
RAILS_ENV=production  gem install bundler

sidekiq is handling multiple queues. Each of them can run as an own process. Per process you should use a max. of 25 threads.

Enable EPEL is a good idea

dnf config-manager --set-enabled powertools
dnf install epel-release

Get the YARN repo

curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo

After a fresh installation, setting some software to the needed release.

yum module enable ruby:3.0 -y
yum module enable nodejs:12 -y
yum module enable postgresql:12 -y

Installing the needed packages

yum install -y git ruby ruby-devel postgresql-devel postgresql-server postgresql \
 postgresql-contrib nodejs.x86_64 yarn make idn2.x86_64 libidn-devel.x86_64 \
 libidn2-devel.x86_64 libidn.x86_64  libicu-devel.x86_64 libicu.x86_64 gcc gcc-c++ \
 libzstd-devel openssl3-devel openssl-devel tar redis nginx certbot.noarch \
 python3-certbot-nginx.noarch ImageMagick.x86_64 libicu-devel.x86_64 postgresql-contrib.x86_64 \
 libffi-devel.x86_64 libyaml-devel.x86_64 autoconf.noarch protobuf-compiler.x86_64 \
 libxml2-devel.x86_64 bison.x86_64 libpq-devel.x86_64 jemalloc-devel rbenv

Add the user and change the home-dir

adduser mastodon
mv /home/mastodon /opt
usermod -d /opt/mastodon mastodon

systemctl start postgresql.service
/usr/bin/postgresql-setup --initdb --unit postgresql
sudo -u postgres psql

CREATE USER mastodon CREATEDB;
\q

su - mastodon

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)

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

Run the interactive setup wizard:

RAILS_ENV=production bundle exec rake mastodon:setup

Copy the prepared nginx.conf into the nginxc config-dir. Change the hostname and the root-dir.

cp /opt/mastodon/live/dist/nginx.conf /etc/nginx/conf.d/mastodon.conf
sed -i 's:/home/mastodon/live/public;:/opt/mastodon/live/public;:g' /etc/nginx/conf.d/mastodon.conf
sed -i 's/example.com/social.server17.net/g' /etc/nginx/conf.d/mastodon.conf

Ensure that the firewall is configured for http and https

firewall-cmd --add-service=http --permanent 
firewall-cmd --add-service=https --permanent 
firewall-cmd --reload

Get a certifcate for your host/hostname

certbot --nginx -d social.server17.net

copy the files

cp /opt/mastodon/live/dist/mastodon-*.service /etc/systemd/system/

and edit the files

sed -i 's:/home/mastodon/:/opt/mastodon/:g' /etc/systemd/system/mastodon-*
sed -i 's:/opt/mastodon/.rbenv/shims/bundle:/bin/bundle:g' mastodon-*

now relaod the systemd and start evertything

systemctl daemon-reload
systemctl enable --now mastodon-web mastodon-sidekiq mastodon-streaming

That is just a how-to which worked for me. Do a Backup in advance!

Backup everything! You do not want to stay up half of the night and fix something.
With the update to the version 4.0 you need a nodejs 14 and also edit some path in the system files. Update nodejs:

yum module reset nodejs
yum module enable nodejs:14
yum -y update

Edit the path for bundle:

sed -i 's:ExecStart=/bin/bundle:ExecStart=/opt/mastodon/bin/bundle:g' /etc/systemd/system/mastodon-*

That is necessary, because in my installation I changed it before.

Here I just followed the manual from Mastodon on Github.

This can take some minutes:

su - mastodon
cd live
git fetch && git checkout v4.0.0
bundle install
yarn install

Also this take some minutes

SKIP_POST_DEPLOYMENT_MIGRATIONS=true RAILS_ENV=production bundle exec rails db:migrate
RAILS_ENV=production bundle exec rails assets:precompile
sudo systemctl restart mastodon-*
RAILS_ENV=production bundle exec rails db:migrate
sudo systemctl restart mastodon-*

su - mastodon
cd live
git fetch && git checkout v4.0.2
bundle install
RAILS_ENV=production bundle exec rails assets:precompile
sudo systemctl restart mastodon-*

YEAH! Welcome to the new version.

sidekiq is handling multiple queues. Each of them can run as an own process. Per process you should use a max. of 25 threads.