Generate CSR and self SSL/TLS signed certificate with multiple SAN or hostname

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Step1: Create a file named sguru.cnf with the following details.

 

[req]
default_bits       = 2048
distinguished_name = req_distinguished_name
req_extensions     = req_ext
prompt = no

[req_distinguished_name]
countryName                    = CA ## Put the country code
stateOrProvinceName     = ON ## Put the state or province code
localityName                     = Toronto ## Put the locality name
organizationName           = My Company Inc ##Put the company name
organizationalUnitName = Sales Team ## This is optional
emailAddress                     =  test@example.com ## Email Address. This is optional.
commonName                   = www.example.com ## Put the common name

[req_ext]

subjectAltName = @alt_names

### You can add more entries as per your requirement.

[alt_names]
DNS.1   = test1.example.com
DNS.2   = test2.example.com
DNS.3   = test3.example.com

 

Step 2: Execute the following command

openssl req -out yourdomain.csr -newkey rsa:2048 -nodes -keyout yourdomain.key -config sguru.cnf

Step 3: You can see that yourdomain.csr generated successfully.

Step4: Verify that the CSR generated correctly. You can use the following command to test this.

openssl req -in yourdomain.csr -noout -text | grep DNS

Step 5: If you are planning to buy SSL/TLS from vendor like digicert then give them this CSR file.

Step 6: If you are planning to setup a self-signed SSL/TLS certificate then please execute the following command.

openssl x509 -signkey yourdomain.key -in yourdomain.csr -req -days 365 -out yourdomain.crt

Now you can see the certificate file as yourdomain.crt

Above command will create a self-signed certificate with 365 days expiry date. If you want to set a higher expiry time then you can do it.

 

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