Update Readme with more hints about configuration options

README.md

@@ -30,30 +30,55 @@ should work:
 couchdb-prometheus-exporter --help
 ````
 
+## Run the binary
+
+You can get an overview over possible configuration options with their defaults in the help screen:
+
+    couchdb-prometheus-exporter --help
+
+Configuration is possible via:
+
+- environment variables (e.g. `COUCHDB_USERNAME=admin`)
+- command line parameters (e.g. `--couchdb.username admin`)
+- configuration file
+
+The configuration file format is the "properties" file format, e.g. like this:
+
+````properties
+couchdb.username=admin
+couchdb.password=a-secret
+````
+
 ## Run it as container
 
-    docker run -p 9984:9984 gesellix/couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --logtostderr
+    docker run --rm -p 9984:9984 gesellix/couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --logtostderr
+
+Please note that host names like `localhost` won't leave the container, so you have to use non-loopback
+dns names or ip addresses when configuring the CouchDB URI.
+
+## Logging
 
 The couchdb-exporter uses the [glog](https://godoc.org/github.com/golang/glog) library for logging.
 With the default parameters everything will be logged to `/tmp/`.
 Use `--logtostderr` to enable logging to stderr and `--help` to see all options.
 
+## CouchDB 2+ clusters
+
 For CouchDB 2.x, you should configure the exporter to fetch the stats from one node, to get
 a complete cluster overview. In contrast to CouchDB 1.x you'll need to configure the admin
 credentials, e.g. like this:
 
-    docker run -p 9984:9984 gesellix/couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --couchdb.username=root --couchdb.password=a-secret
+    couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --couchdb.username=root --couchdb.password=a-secret
 
 ## Database disk usage stats
 
 If you need database disk usage stats, add a comma separated list of database names like this:
 
-    docker run -p 9984:9984 gesellix/couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --databases=db-1,db-2 --couchdb.username=root --couchdb.password=a-secret
+    couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --databases=db-1,db-2 --couchdb.username=root --couchdb.password=a-secret
 
 Or, if you want to get stats for every database, please use `_all_dbs` as database name:
 
-    docker run -p 9984:9984 gesellix/couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --databases=_all_dbs --couchdb.username=root --couchdb.password=a-secret
-
+    couchdb-prometheus-exporter --couchdb.uri=http://couchdb:5984 --databases=_all_dbs --couchdb.username=root --couchdb.password=a-secret
 
 ## Monitoring CouchDB with Prometheus, Grafana and Docker