Update PWA ssl cert instructions perfsonar/psconfig-web#79

pwa_readme.rst

@@ -130,21 +130,34 @@ downloading and deploying PWA's default configuration files from git repo.
 Host Certificates
 ~~~~~~~~~~~~~~~~~
 
-You will need SSL certificates for https access. If these don't already exist, they will be created when you start up the ``sca-auth`` docker container.
+You will need SSL certificates for https access.
 
-In ``/etc/pwa/auth``\ , you should see your host certificate with following file names, or place them there if not. If you want to replace the automatically-generated certs with your own, copy them over these files.
+If you want to generate self-signed certs, you can do so like this, or use `this script <https://raw.githubusercontent.com/perfsonar/psconfig-web/master/deploy/generate_nginx_cert.sh>`_\ :
 
 .. code-block:: bash
 
-   $ ls /etc/pwa/auth
-   cert.pem 
+   CERT_PATH="/etc/pwa/nginx/certs"
+   mkdir -p "$CERT_PATH"
+   openssl req -x509 -nodes -days 10000 -newkey rsa:2048 -keyout "$CERT_PATH/key.pem" -out "$CERT_PATH/cert.pem" -batch
+   chmod 640 "$CERT_PATH/*.pem"
+
+If you want to provide your own certs, place them in ``/etc/pwa/nginx/certs`` with these names:
+
+.. code-block:: bash
+
+   cert.pem
    key.pem
 
-If you are enabling x509 authentication, then you will also need ``trusted.pem``. This file contains list of all CAs that you trust and grant access to PWA.
+If you are enabling x509 authentication, then you will also need ``trusted.pem``\ ; This file contains list of all CAs that you trust and grant access to PWA. You will have to adapt the nginx config in ``/etc/pwa/nginx/conf.d/pwa.conf`` as follows:
+
+.. code-block:: bash
+
+   ssl_client_certificate /etc/nginx/certs/trusted.pem
+   ssl_verify_client on
 
 ..
 
-   Unlike Apache, Nginx uses a single CA file for better performance.. so you have to join all .pem into a single .pem file.
+   Unlike Apache, Nginx uses a single CA file for better performance.. so you have to join all .pem into a single ``trusted.pem file``
 
 
 Container Installation