Install/update the latest ca-certificates package. # yum install ca-certificates
Enable the dynamic CA configuration feature by running: # update-ca-trust enable
Copy the RapidSSL Intermediate CA certificate to the directory /etc/pki/ca-trust/source/anchors/: # cp rapidSSL-ca.crt /etc/pki/ca-trust/source/anchors/
Extract and add the Intermediate CA certificate to the list of trusted CA’s: # update-ca-trust extract
Verify the SSL certificate signed by RapidSSL: # openssl verify server.crt server.crt : OK