lscpu | grep -i VirtualizationVT-xfor IntelAMD-Vifor AMD
# Generate a new RSA 4096bit(default is 2048bits) key
# and encrypt it with a passphrase based on AES CBC 256 cipher:
openssl genrsa -aes256 -out private_key.pem 4096
# Generate a new RSA 4096bit(default is 2048bits) key without a passphrase:
openssl genrsa -out private_key.pem 4096