Setup:

• Install node modules via npm install
• Fill .env file with Discord login credentials (DISCORD_MAIL and DISCORD_PASSWORD)
• Build docker container:

cd discord-bot/node
docker build -t node-ffmpeg .

• Run docker container:

docker run -d --sig-proxy=false --name discord-bot -v "$PWD":/usr/src/app -w /usr/src/app -v "$PWD/uploads":/uploads -p 8080:8080 node-ffmpeg node server.js

• Install systemd service file:

cat << EOF > /etc/systemd/system/discord-bot.service
[Unit]
Description=Discord Bot
Requires=docker.service
After=docker.service

[Service]
Restart=always
ExecStart=/usr/bin/docker start -a discord-bot
ExecStop=/usr/bin/docker stop -t 2 discord-bot

[Install]
WantedBy=local.target
EOF

Requirements:

for the youtube download to work you will need the youtube-dl package as well as ffmpeg

apt-get install youtube-dl ffmpeg