[Add]prometheus default config file for node_exporter

docker/prometheus/Dockerfile

@@ -9,8 +9,9 @@ RUN curl -fsSL https://github.com/prometheus/prometheus/releases/download/v2.54.
     rm /usr/local/bin/prometheus-* -rf && \
     chmod +x /usr/local/bin/prometheus
 
-RUN mkdir /etc/prometheus/ && \
-    touch /etc/prometheus/prometheus.yml
+RUN mkdir /etc/prometheus/
+
+COPY prometheus.yml /etc/prometheus/prometheus.yml
 
 CMD ["prometheus", "--config.file=/etc/prometheus/prometheus.yml"]
 

docker/prometheus/prometheus.yml

@@ -0,0 +1,7 @@
+global:
+  scrape_interval: 15s
+
+scrape_configs:
+  - job_name: 'node_exporter'
+    static_configs:
+      - targets: ['node-exporter:9100']