When hosting customers are after a new SSL certificate from a 3rd party company such as Comodo, Thwaites and alike, they’ll need a CSR generating. Using OpenSSL, this will create a unique key and a CSR file after the fields are filled in.
openssl req -new -newkey rsa:2048 -nodes -keyout customer.key – out customer.csr
When filling in the common name details, it’s often wise to keep the same details as entered previously. If it’s the first time, make a note of them.
The rsa:2048 section is the type and size of encryption.