SSH SERVER LINK

For genrating the certificate of ssh CA:-

$ sudo openssl req -x509  -nodes -days365 -newkey rsa:2048 -keyout /etc/nginx/ssl/nginx.key -out /etc/nginx/ssl/nginx.crt

• openssl: This is the basic command line tool for creating and managing OpenSSL certificates, keys, and other files.
• req: This subcommand specifies that we want to use X.509 certificate signing request (CSR) management. The "X.509" is a public key infrastructure standard that SSL and TLS adheres to for its key and certificate management. We want to create a new X.509 cert, so we are using this subcommand.
• -x509: This further modifies the previous subcommand by telling the utility that we want to make a self-signed certificate instead of generating a certificate signing request, as would normally happen.
• -nodes: This tells OpenSSL to skip the option to secure our certificate with a passphrase. We need Nginx to be able to read the file, without user intervention, when the server starts up. A passphrase would prevent this from happening because we would have to enter it after every restart.
• -days 365: This option sets the length of time that the certificate will be considered valid. We set it for one year here.
• -newkey rsa:2048: This specifies that we want to generate a new certificate and a new key at the same time. We did not create the key that is required to sign the certificate in a previous step, so we need to create it along with the certificate. The rsa:2048 portion tells it to make an RSA key that is 2048 bits long.
• -keyout: This line tells OpenSSL where to place the generated private key file that we are creating.
  
• -out: This tells OpenSSL where to place the certificate that we are creating.     
• Now configure the nginx into its server file which are located into sites-available.
• Enter the 

• server_name your_domain.com;
          ssl_certificate /etc/nginx/ssl/nginx.crt;
          ssl_certificate_key /etc/nginx/ssl/nginx.key;

• Now Restart the nginx server using the command

• sudo service nginx restart

• Next run or domain name or ip for checking that nginx configure correctly.