How to install Let's Chat (Persistent Messaging Application) on Ubuntu

Update Server: apt update && apt upgrade -y

Set hostname: hostnamectl set-hostname letschat.example.com

Install Node.JS: apt install dirmngr gnupg apt-transport-https ca-certificates software-properties-common -y curl -sL https://deb.nodesource.com/setup_18.x | bash - apt install nodejs -y node -v

Install MongoDB Database: wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu2_amd64.deb dpkg -i libssl1.1_1.1.1f-1ubuntu2_amd64.deb wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | apt-key add - echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | tee /etc/apt/sources.list.d/mongodb-org-4.4.list apt update apt install -y mongodb-org systemctl start mongod systemctl enable mongod systemctl status mongod

Install Let's Chat: git clone https://github.com/sdelements/lets-chat.git cd lets-chat npm install cp settings.yml.sample settings.yml npm start ctrl+c

Create a Systemd Service File for Let's Chat: nano /etc/systemd/system/letschat.service paste [Unit] Description=Let's Chat Server Wants=mongodb.service After=network.target mongod.service

[Service] Type=simple WorkingDirectory=/root/lets-chat ExecStart=/usr/bin/npm start User=root Group=root Restart=always RestartSec=9

[Install] WantedBy=multi-user.target

systemctl daemon-reload systemctl start letschat systemctl enable letschat systemctl status letschat ss -antpl | grep 5000

Configure Nginx for Let's Chat: apt install nginx -y nano /etc/nginx/conf.d/letschat.conf paste server { server_name letschat.example.com; listen 80;

access_log /var/log/nginx/lets_chat-access.log; error_log /var/log/nginx/lets_chat-error.log;

location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $host; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection 'upgrade'; proxy_cache_bypass $http_upgrade; proxy_pass http://127.0.0.1:5000; } }

nginx -t systemctl restart nginx systemctl status nginx

Access Let's Chat Web Interface: http://letschat.example.com ... https://www.youtube.com/watch?v=iAUeyP0VJBo