Merge pull request #258 from codership/revamp-ssl-documentation

Issue #252

galeracluster/source/documentation/ssl-cert.rst

@@ -153,7 +153,9 @@ The node uses the client certificate to secure client-side activity.  In the eve
             -CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 \
             -out client-cert.pem
 
-This creates a key and certificate file for the database client.  They are in the current working directory as ``client-key.pem`` and ``client-cert.pem``.  Each node requires both to secure client activity and state snapshot transfers.
+This creates a key and certificate file for the database client.  They are in the current working directory as ``client-key.pem`` and ``client-cert.pem``.  
+
+.. note:: Each node requires both to secure client activity and state snapshot transfers.
 
 
 .. _`verify-cert`:
@@ -172,6 +174,8 @@ When you finish creating the key and certificate files, use ``openssl`` to verif
 
 In the event that this verification fails, repeat the above process to generate replacement certificates.
 
+The Common Name value used for the server and client certificates/keys must each differ from the Common Name value used for the CA certificate. Otherwise, the certificate and key files will not work for servers compiled using OpenSSL.
+
 Once the certificates pass verification, you can send them out to each node.  Use a secure method, such as ``scp`` or ``sftp``.  The node requires the following files:
 
 - Certificate Authority: ``ca-cert.pem``.