Merge pull request #51 from Crapworks/docker

Allow overwriting of ceph-dash configfile location

README.md

@@ -150,6 +150,25 @@ app.run(host='0.0.0.0', port=6666, debug=True)
 ```
 Please keep in mind that the development server should not be used in a production environment. Ceph-dash should be deployed into a proper webserver like Apache or Nginx.
 
+### Running ceph-dash behind a reverse proxy
+
+Since Version 1.2 ceph-dash is able to run behind a reverse proxy that rewrites the path where ceph-dash resides correctly. If you are using nginx, you need to use a config like this:
+
+```
+server {
+    location /foobar {
+        proxy_pass http://127.0.0.1:5000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Scheme $scheme;
+        proxy_set_header X-Script-Name /foobar;
+    }
+}
+
+```
+
+See also: https://github.com/wilbertom/flask-reverse-proxy, which is where I got the code for doing this.
+
 ### Problems with NginX and uwsgi
 
 See [this issue](/../../issues/35) for a detailed explanation how to fix errors with NginX and uwsgi (Thanks to [@Lighiche](https://github.com/Lighiche))

app/__init__.py

@@ -15,6 +15,61 @@
 app.static_folder = join(dirname(__file__), 'static')
 
 
+class FlaskReverseProxied(object):
+    """
+    Flask reverse proxy extension ripped of from:
+    https://github.com/wilbertom/flask-reverse-proxy/
+    """
+    def __init__(self, app=None):
+        self.app = None
+        if app is not None:
+            self.init_app(app)
+
+    def init_app(self, app):
+        self.app = app
+        self.app.wsgi_app = ReverseProxied(self.app.wsgi_app)
+        return self
+
+
+class ReverseProxied(object):
+    """
+    Wrap the application in this middleware and configure the
+    front-end server to add these headers, to let you quietly bind
+    this to a URL other than / and to an HTTP scheme that is
+    different than what is used locally.
+    In nginx:
+    location /prefix {
+        proxy_pass http://192.168.0.1:5001;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Scheme $scheme;
+        proxy_set_header X-Script-Name /prefix;
+        }
+    :param app: the WSGI application
+    """
+    def __init__(self, app):
+        self.app = app
+
+    def __call__(self, environ, start_response):
+        script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
+        if script_name:
+            environ['SCRIPT_NAME'] = script_name
+            path_info = environ.get('PATH_INFO', '')
+            if path_info and path_info.startswith(script_name):
+                environ['PATH_INFO'] = path_info[len(script_name):]
+        server = environ.get('HTTP_X_FORWARDED_SERVER_CUSTOM',
+                             environ.get('HTTP_X_FORWARDED_SERVER', ''))
+        if server:
+            environ['HTTP_HOST'] = server
+
+        scheme = environ.get('HTTP_X_SCHEME', '')
+
+        if scheme:
+            environ['wsgi.url_scheme'] = scheme
+
+        return self.app(environ, start_response)
+
+
 class UserConfig(dict):
     """ loads the json configuration file """
 
@@ -31,6 +86,7 @@ def _string_decode_hook(self, data):
     def __init__(self):
         dict.__init__(self)
         configfile = join(dirname(dirname(__file__)), 'config.json')
+        configfile = os.environ.get('CEPHDASH_CONFIGFILE', configfile)
         self.update(json.load(open(configfile), object_hook=self._string_decode_hook))
 
         if os.environ.get('CEPHDASH_CEPHCONFIG', False):
@@ -70,3 +126,6 @@ def __init__(self):
 
 # load dashboard and graphite endpoint
 app.register_blueprint(DashboardResource.as_blueprint())
+
+# enable reverse proxy support
+proxied = FlaskReverseProxied(app)

contrib/docker/entrypoint.sh

@@ -8,6 +8,7 @@ echo "* CEPHMONS (comma separated list of ceph monitor ip addresses)"
 echo "* KEYRING (full keyring to deploy in docker container)"
 echo ""
 echo "# OPTIONAL ENVIRONMENT VARIABLES"
+echo "* CONFIG (path to ceph-dash config file"
 echo "* NAME (keyring name to use)"
 echo "* ID (keyting id to use)"
 echo ""
@@ -21,6 +22,11 @@ ceph -s
 export CEPHDASH_CEPHCONFIG="${CEPHCONFIG}"
 export CEPHDASH_KEYRING="${CEPHKEYRING}"
 
+
+if [ -n "${CONFIG}" ]; then
+    export CEPHDASH_CONFIGFILE="${CONFIG}"
+fi
+
 if [ -n "${NAME}" ]; then
     export CEPHDASH_NAME="${NAME}"
 fi