OpenSSL cheatsheet
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Link: https://www.altj.com/cheat-sheets/openssl-cheat-sheet/


Create a self-signed SSL certificate

$ openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout www.example.com.key -out www.example.com.crt

Create a new CSR

    $ openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

Check that key files match cert & request files:

    $ openssl rsa -noout -modulus -in FILE.key
    $ openssl req -noout -modulus -in FILE.csr
    $ openssl x509 -noout -modulus -in FILE.cer