openssl.cnf

[req]
default_bits       = 2048
default_md         = sha256
distinguished_name = req_distinguished_name
req_extensions     = req_ext
x509_extensions    = v3_ca # The extensions to add to the self-signed cert

[req_distinguished_name]
countryName                 = Country Name (2 letter code)
countryName_default         = US
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = California
localityName                = Locality Name (eg, city)
localityName_default        = San Francisco
organizationName            = Organization Name (eg, company)
organizationName_default    = My Company
commonName                  = Common Name (eg, fully qualified host name)
commonName_default          = localhost

[req_ext]
subjectAltName = @alt_names

[v3_ca]
subjectAltName = @alt_names

[alt_names]
DNS.1   = localhost