Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# PowerDNS RADOS Gateway backend
+
+A backend for PowerDNS to direct RADOS Gateway bucket traffic to the correct regions.
+
+For example, two regions exist, US and EU.
+
+    EU: o.myobjects.eu
+    US: o.myobjects.us
+
+A global domain o.myobjects.com exists.
+
+Bucket 'foo' exists in the region EU and 'bar' in US.
+
+    foo.o.myobjects.com will return a CNAME to foo.o.myobjects.eu
+    bar.o.myobjects.com will return a CNAME to foo.o.myobjects.us
+
+The HTTP Remote Backend from PowerDNS is used in this case: http://doc.powerdns.com/html/remotebackend.html
+
+PowerDNS must be compiled with Remote HTTP backend support enabled, this is not default.
+
+For more information visit the [Blueprint](http://wiki.ceph.com/Planning/Blueprints/Firefly/PowerDNS_backend_for_RGW)
+
+# Configuration
+
+## PowerDNS
+    launch=remote
+    remote-connection-string=http:url=http://localhost:6780/dns
+
+## PowerDNS backend
+Usage for this backend is showed by invoking with --help. See rgw-pdns.conf.in for a configuration example
+
+The ACCESS and SECRET key pair requires the caps "metadata=read"
+
+# Testing
+
+$ curl -X GET http://localhost:6780/dns/lookup/foo.o.myobjects.com/ANY
+
+Should return something like:
+
+    {
+     "result": [
+      {
+       "content": "foo.o.myobjects.eu",
+       "qtype": "CNAME",
+       "qname": "foo.o.myobjects.com",
+       "ttl": 60
+      }
+     ]
+    }
+
+## WSGI
+You can run this backend directly behind an Apache server with mod_wsgi
+
+    WSGIScriptAlias / /var/www/pdns-backend-rgw.py
+
+Placing that in your virtualhost should be sufficient.
+
+Afterwards point PowerDNS to localhost on port 80:
+
+    launch=remote
+    remote-connection-string=http:url=http://localhost/dns