Generating the SSL cert by a config

server_ssl.cnf

cat server_ssl.cnf
```
[req]
distinguished_name = req_distinguished_name
attributes = req_attributes
req_extensions = v3_req
prompt = no

[req_distinguished_name]
C = DE
L = Stadt
O = GmbH
OU = Abteilung
CN = test.com

[req_attributes]

[v3_req]
keyUsage = keyEncipherment, dataEncipherment
extendedKeyUsage = serverAuth
subjectAltName = @alt_names

[alt_names]
DNS.1 = test.com
DNS.2 = test2.com
DNS.3 = test3.com
```
openssl genrsa -out ssl_cert.key 4096
openssl req -new -key ssl_cert.key -out ssl_cert.csr -config server_ssl.cnf
openssl req -in ssl_cert.csr -text -noout