using environment variables

README.md

@@ -1,2 +1,10 @@
 # docker-observation
+
 Various tools to monitor Docker containers
+
+## Environment Variables
+
+- `DOCKER_INFLUXDB_INIT_ORG`
+- `INFLUX_WRITE_TOKEN`
+- `INFLUX_HOST`
+- `LOKI_HOST`

docker-compose.yml

@@ -13,8 +13,13 @@ services:
   promtail:
     image: grafana/promtail
     restart: unless-stopped
+    env_file:
+      - .env
     volumes:
       - ./promtail:/etc/promtail
       - /var/run/docker.sock:/var/run/docker.sock
       - /var/log:/var/log:ro
-    command: -config.file=/etc/promtail/promtail-config.yml
+    command: [
+      "-config.file=/etc/promtail/promtail-config.yml",
+      "-config.expand-env=true"
+    ]

promtail/promtail-config.yml

@@ -6,7 +6,7 @@ positions:
   filename: /tmp/positions.yaml
 
 clients:
-  - url: http://loki:3100/loki/api/v1/push
+  - url: http://${LOKI_HOST}:3100/loki/api/v1/push
 
 scrape_configs:
   - job_name: flog_scrape
@@ -19,5 +19,5 @@ scrape_configs:
         target_label: 'container'
       - source_labels: ['__meta_docker_container_log_stream']
         target_label: 'logstream'
-      # - target_label: 'host'
+      - target_label: 'host'
-      #   replacement: 'docker-lxc'
+        replacement: '${HOSTNAME}'

telegraf/telegraf.conf

@@ -80,7 +80,7 @@
   ## Multiple URLs can be specified for a single cluster, only ONE of the
   ## urls will be written to each interval.
   ##   ex: urls = ["https://us-west-2-1.aws.cloud2.influxdata.com"]
-  urls = ["http://influxdb:8086"]
+  urls = ["http://${INFLUX_HOST}:8086"]
 
   ## Token for authentication.
   token = "$INFLUX_WRITE_TOKEN"