Execute the following commands from the folder in which the certificate files need to be stored.
openssl genrsa -des3 -passout pass:x -out server.pass.key 2048openssl rsa -passin pass:x -in server.pass.key -out server.keyrm server.pass.keyopenssl req -new -key server.key -out server.csropenssl x509 -req -sha256 -days 365 -in server.csr -signkey server.key -out server.crt