How to create a self-signed certificate using OpenSSL

1. Create a key

/etc/nginx/certificates$ sudo openssl ecparam -genkey -name prime256v1 -out your.company.com.ecc.key.pem

2. Create a CSR

/etc/nginx/certificates$ sudo  openssl req -new -key your.company.com.ecc.key.pem -out your.company.com.ecc.csr.pem

3. Create a certificate

/etc/nginx/certificates$ sudo openssl req -x509 -days 365 -key your.company.com.ecc.key.pem -in your.company.com.ecc.csr.pem -out your.company.com.ecc.crt.pem

4. View a certificate

/etc/nginx/certificates$ sudo openssl x509 -text -noout -in your.company.com.ecc.crt.pem