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openssl genrsa -des3 -passout pass:x -out server.pass.key 2048

openssl rsa -passin pass:x -in server.pass.key -out server.key

[observe]
writing RSA key

rm server.pass.key

openssl req -new -key server.key -out server.csr

[answer few questions]
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:California
A challenge password []:

openssl x509 -req -sha256 -days 365 -in server.csr -signkey server.key -out server.crt