Debian 8 Jessie
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Create SSL Certificates
  Create a your server's original SSL Certificate. If you use your server as a business, it had better buy and use a Formal Certificate from Verisigh and so on.
cd /etc/ssl/private

openssl genrsa -aes128 -out server.key 2048

Generating RSA private key, 2048 bit long modulus
e is 65537 (0x10001)
Enter pass phrase for server.key:
# set passphrase

Verifying - Enter pass phrase for server.key:
# confirm
# remove passphrase from private key

openssl rsa -in server.key -out server.key

Enter pass phrase for server.key:
# input passphrase

writing RSA key
openssl req -new -days 3650 -key server.key -out server.csr

You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
Country Name (2 letter code) [AU]:
# country

State or Province Name (full name) [Some-State]:
# state

Locality Name (eg, city) []:
# city

Organization Name (eg, company) [Internet Widgits Pty Ltd]:
# company

Organizational Unit Name (eg, section) []:
Server World
# department

Common Name (e.g. server FQDN or YOUR name) []:
# server's FQDN

Email Address []:
# email address
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650

Signature ok
subject=/C=JP/ST=Hiroshima/L=Hiroshima/O=GTS/OU=Server World/
Getting Private key
chmod 400 server.*