How to generate a Multi Domain CSR for SSL setup

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A certificate signing request is an encoded file that is generated in a server or device using a private key. It is then given to the certificate authority to create a server certificate. This server certificate will only with the private key that was used to generate the CSR.

In case of generating a CSR with multiple domain names , we need to use a conf file . This post provides the necessary details to do that. To download and install the openssl for your server , follow the below steps.

OpenSSL Download link:

/source/index.html

OpenSSL Github Repo link:

openssl/openssl

OpenSSL Installation in Windows Platforms link:

openssl/openssl

To create a multi domain , first create a conf file , you can use the below conf file as reference.

Run the below openssl command to generate the csr, it will also create the private key as part of this.

openssl req -new -out certificate-signing-request.csr -newkey rsa:2048 -nodes -sha256 -keyout private.key -config csr.conf

If you want to generate the default key file specified in the csr, use the below command

openssl req -new -nodes -out certificate-signing-request.csr -config csr.conf