Create SAN (Subject Alternative Names) certificate with OpenSSL

[cah]

Create a file named san.cnf with the following information:

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[ req ]
default_bits       = 2048
distinguished_name = req_distinguished_name
req_extensions     = req_ext
[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
stateOrProvinceName         = State or Province Name (full name)
localityName               = Locality Name (eg, city)
organizationName           = Organization Name (eg, company)
commonName                 = Common Name (e.g. server FQDN or YOUR name)
[ req_ext ]
subjectAltName = @alt_names
[alt_names]
DNS.1   = bestflare.com
DNS.2   = usefulread.com
DNS.3   = chandank.com

Use the following command to generate CSR and key:

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openssl req -out sslcert.csr -newkey rsa:2048 -nodes -keyout private.key -config san.cnf

Use the following command to verify CSR for SAN:

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# openssl req -noout -text -in sslcert.csr | grep DNS

DNS:bestflare.com, DNS:usefulread.com, DNS:chandank.com