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Create private key:

openssl genrsa -out server.key 4096

Configuration File: server.conf

distinguished_name = req_distinguished_name
req_extensions = v3_req
prompt = no

[req_distinguished_name]
C = COUNTRY
L = LOCATION
O = ORGANIZATION
OU = ORGANIZATION UNIT
CN = *.lab.mueller.world

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

[alt_names]
DNS.1 = *.lab.mueller.world

Create Certificate Signing Request (CSR) using OpenSSL