[ssl] How to create a self-signed certificate with OpenSSL

One liner FTW. I like to keep it simple. Why not use one command that contains ALL the arguments needed? This is how I like it - this creates an x509 certificate and its PEM key:

openssl req -x509 \
 -nodes -days 365 -newkey rsa:4096 \
 -keyout self.key.pem \
 -out self-x509.crt \
 -subj "/C=US/ST=WA/L=Seattle/CN=example.com/[email protected]"

That single command contains all the answers you would normally provide for the certificate details. This way you can set the parameters and run the command, get your output - then go for coffee.

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