[loadgen] - expose loadgen with env vars (#316)

Author: puckpuck

.env

@@ -7,9 +7,6 @@ OTEL_EXPORTER_OTLP_ENDPOINT=http://otelcol:4317
 OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=${OTEL_EXPORTER_OTLP_ENDPOINT}
 OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=${OTEL_EXPORTER_OTLP_ENDPOINT}
 
-# Load Generator
-USERS=10
-
 # Frontend
 FRONTEND_PORT=8080
 FRONTEND_ADDR=frontend:${FRONTEND_PORT}
@@ -51,6 +48,13 @@ FEATURE_FLAG_SERVICE_ADDR=featureflagservice:${FEATURE_FLAG_SERVICE_PORT}
 FEATURE_FLAG_GRPC_SERVICE_PORT=50053
 FEATURE_FLAG_GRPC_SERVICE_ADDR=featureflagservice:${FEATURE_FLAG_GRPC_SERVICE_PORT}
 
+# Load Generator
+LOCUST_WEB_PORT=8089
+LOCUST_USERS=10
+LOCUST_HOST=http://${FRONTEND_ADDR}
+LOCUST_AUTOSTART=true
+LOCUST_HEADLESS=false
+
 # Prometheus
 PROMETHEUS_SERVICE_PORT=9090
 

.github/.mlc_config.json

@@ -3,6 +3,7 @@
         {"pattern": "^http://localhost:3000"},
         {"pattern": "^http://localhost:8080"},
         {"pattern": "^http://localhost:8081"},
+        {"pattern": "^http://localhost:8089"},
         {"pattern": "^http://localhost:9090"},
         {"pattern": "^http://localhost:16686"},
         {"pattern": "^https://calendar.google.com/calendar"}

CHANGELOG.md

@@ -75,3 +75,5 @@ significant modifications will be credited to OpenTelemetry Authors.
 ([#245](https://github.com/open-telemetry/opentelemetry-demo/pull/245))
 * Added Frontend Instrumentation
 ([#293](https://github.com/open-telemetry/opentelemetry-demo/pull/293))
+* Enable Locust loadgen environment variable config options
+([#316](https://github.com/open-telemetry/opentelemetry-demo/pull/316))

docker-compose.yml

@@ -341,9 +341,14 @@ services:
     build:
       context: ./
       dockerfile: ./src/loadgenerator/Dockerfile
+    ports:
+      - "${LOCUST_WEB_PORT}:${LOCUST_WEB_PORT}"
     environment:
-      - FRONTEND_ADDR
-      - USERS
+      - LOCUST_WEB_PORT
+      - LOCUST_USERS
+      - LOCUST_HOST
+      - LOCUST_HEADLESS
+      - LOCUST_AUTOSTART
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
       - OTEL_SERVICE_NAME=loadgenerator
       - PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python

docs/docker_deployment.md

@@ -50,6 +50,7 @@ Once the images are built and containers are started you can access:
 - Prometheus: <http://localhost:9090/>
 - Grafana: <http://localhost:3000/>
 - Feature Flags UI: <http://localhost:8081/>
+- Load Generator UI: <http://localhost:8089/>
 
 ## Bring your own backend
 

src/loadgenerator/Dockerfile

@@ -20,4 +20,4 @@ COPY ./src/loadgenerator/ ./
 
 RUN pip install --prefix="/usr/local/" -r ./requirements.txt
 
-ENTRYPOINT locust --host="http://${FRONTEND_ADDR}" --headless -u "${USERS}"
+ENTRYPOINT locust