This website details the process of creating a certificate 

https://www.digicert.com/csr-creation-apache.htm

1. On the host VM run the following command :

    {{{sudo openssl req -new -newkey rsa:2048 -sha256 -nodes -keyout briccs.xuhl-tr.nhs.uk.key -out briccs.xuhl-tr.nhs.uk.csr}}}

Ensure that the prefix for the .key and .csr is you domain name.

This command requires the following user input :

{{{#!rst

Generating a 2048 bit RSA private key
........+++
.................................+++
writing new private key to 'uhlbriccsext01.xuhl-tr.nhs.uk.key'
-----
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]:UK
State or Province Name (full name) [Some-State]:Leicestershire
Locality Name (eg, city) []:Leicester
Organization Name (eg, company) [Internet Widgits Pty Ltd]:University Hospitals of Leicester NHS Trust
Organizational Unit Name (eg, section) []:Cardiovascular
Common Name (e.g. server FQDN or YOUR name) []:uhlbriccsext01.xuhl-tr.nhs.uk
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []: Pa55word
An optional company name []:

}}}

This command generates a .key and .csr

uhlbriccsext01.xuhl-tr.nhs.uk

sudo openssl req -new -newkey rsa:2048 -sha256 -nodes -keyout uhlbriccsext01.xuhl-tr.nhs.uk.key -out uhlbriccsext01.xuhl-tr.nhs.uk.csr

send text of csr to Robert.Hallett@uhl-tr.nhs.uk

ask him to create a base46 cer which is in text format and not binary

add the file to this directory /share/cert/live/