How to obtain free SSL (HTTPs) certificate for your domain using few lines in terminal

SSL Certificate is required to use your IP or Domain Name and communicate via https protocol

tl;dr:

# Add firewall rule (optional)
sudo ufw allow 80
# Get certificate for %DOMAIN_NAME%
sudo certbot certonly --standalone --preferred-challenges http -d %DOMAIN_NAME%
# Delete firewall rule (optional)
sudo ufw delete allow 80
# Check obtained certificates
>> sudo ls /etc/letsencrypt/live/{your-domain-name}
README cert.pem  chain.pem  fullchain.pem  privkey.pem

HowTo:

We will use certbot for that

# Install certbot app
sudo apt-get install certbot
# Use it
sudo apt install certbot python3-certbot-nginx

Then

sudo certbot run -n --nginx --agree-tos -d blue.iq.mynalabs.ai,www.blue.iq.mynalabs.ai -m  mygmailid@gmail.com  --redirect

Don’t forget to turn off nginx:

systemctl stop nginx

All certificates are (by default) in:

>> sudo ls /etc/letsencrypt/live/{your-domain-name}
README cert.pem  chain.pem  fullchain.pem  privkey.pem

To check the certificate to be valid:

sudo cat /etc/letsencrypt/live/{your-domain-name}/cert.pem | openssl x509 -noout -enddate -startdate

That’s it. You are awesome