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# Specify server for which the certificate should be created
server_name=myhost

# Create and sign Server Certificate
openssl x509 -req -sha512 -days 3652 \
    -in ${server_name}.csr \
    -CA root-ca.crt \
    -CAkey root-ca.key \
    -CAcreateserial \
    -out ${server_name}.crt \
    -extfile <(printf 'subjectAltName=DNS:%s\nkeyUsage=critical,keyEncipherment,digitalSignature\nextendedKeyUsage=serverAuth,clientAuth\n' "${server_name}")