$ openssl req -config example-com.conf \
    -new -x509 -sha256 -newkey rsa:2048 -nodes \
    -keyout example-com.key.pem \
    -days 36500 \
    -out example-com.cert.pem
Generating a 2048 bit RSA private key
....+++
.....................+++
writing new private key to 'example-com.key.pem'
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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) [US]:XW
State or Province Name (full name) [NY]:XW
Locality Name (eg, city) [New York]:The Internet
Organization Name (eg, company) [Example, LLC]:Scrapy
Common Name (e.g. server FQDN or YOUR name) [Example Company]:www.example.com
Email Address [test@example.com]: