update docker compose and README

README.md

@@ -1,2 +1,82 @@
 # prometheus-pusher
+
 collection prometheus data and push to pushgateway
+
+## Architecture
+
+![](http://7pn5d3.com1.z0.glb.clouddn.com/prometheus_pusher.png)
+
+## Feature
+
+* Support Prometheus Config File
+* Support Prometheus Service Discovery
+
+## How To Use
+
+Prepare prometheus config file **/ect/prom-conf/prometheus.yml**
+
+```
+global:                                                                         
+  scrape_interval:     15s
+  evaluation_interval: 15s
+  external_labels:                                                              
+      monitor: 'exporter-metrics'                                                
+                                                                                
+scrape_configs:
+
+- job_name: 'HostsMetrics'
+  dns_sd_configs:
+  - names:
+    - node-exporter
+    refresh_interval: 15s
+    type: A
+    port: 9100
+
+- job_name: 'ContainerMetrics'
+  static_configs:
+    - targets:
+      - 'rancher-server:9108'
+- job_name: 'RancherServerMetrics'
+  dns_sd_configs:
+  - names:
+    - cadvisor
+    refresh_interval: 15s
+    type: A
+    port: 8080
+
+- job_name: 'RancherApi'
+  dns_sd_configs:
+  - names:
+    - 'prometheus-rancher-exporter'
+    refresh_interval: 15s
+    type: A
+    port: 9173
+
+- job_name: 'Prometheus'
+  static_configs:
+    - targets:
+      - '127.0.0.1:9090'
+
+```
+
+work with docker-compose
+
+> Note: you should set the environment variable of PushGateway address 
+
+```
+version: '2'
+services:
+  pusher:
+    image: wisecity/prometheus-pusher
+    environment:
+      PUSH_GATEWAY: http://pushgateway.example.org:9091
+    volumes:
+    - /ect/prom-conf:/etc/prom-conf
+    entrypoint:
+    - /bin/prometheus_pusher
+    - -config.file
+    - /etc/prom-conf/prometheus.yml
+```
+
+
+

docker-compose.yml

@@ -2,6 +2,8 @@ version: '2'
 services:
   pusher:
     image: wisecity/prometheus-pusher
+    environment:
+      PUSH_GATEWAY: http://pushgateway.example.org:9091
     volumes_from:
     - conf
     entrypoint: