add promtail

.gitignore

@@ -1,3 +1,4 @@
 .env
 db_data
 letsencrypt
+promtail-positions

docker-compose.yml

@@ -95,10 +95,22 @@ services:
     - proxy-tier
     volumes:
     - ./letsencrypt:/etc/letsencrypt
+    - logs:/logs
     ports:
     - "80:80"
     - "443:443"
 
+  promtail:
+    image: grafana/promtail:latest
+    volumes:
+      - /etc/machine-id:/etc/machine-id
+      - logs:/logs:ro
+      - ./promtail.yml:/etc/promtail/promtail.yml
+      - ./promtail-positions:/positions
+    environment:
+      - LOKI=${LOKI_URL}
+    command: -config.file=/etc/promtail/promtail.yml -config.expand-env=true
+
 networks:
   proxy-tier:
   db-tier:
@@ -106,3 +118,4 @@ networks:
 
 volumes:
   certs:
+  logs:

promtail.yml

@@ -0,0 +1,19 @@
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /positions/positions.yaml
+
+clients:
+  - url: https://${LOKI}/loki/api/v1/push
+
+scrape_configs:
+  - job_name: nginx
+    static_configs:
+      - targets:
+          - demos.tf
+        labels:
+          job: varlogs
+          host: demos.tf
+          __path__: /logs/*log