docker: upgrade docker-compose setup

README.md

@@ -6,6 +6,7 @@
 - [Deprecation of Legacy Ratelimit Proto](#deprecation-of-legacy-ratelimit-proto)
   - [Deprecation Schedule](#deprecation-schedule)
 - [Building and Testing](#building-and-testing)
+  - [Docker-compose setup](#docker-compose-setup)
 - [Configuration](#configuration)
   - [The configuration format](#the-configuration-format)
     - [Definitions](#definitions)
@@ -90,6 +91,22 @@ go [here](https://golang.org/doc/install).
   USE_STATSD=false LOG_LEVEL=debug REDIS_SOCKET_TYPE=tcp REDIS_URL=localhost:6379 RUNTIME_ROOT=/home/user/src/runtime/data RUNTIME_SUBDIRECTORY=ratelimit
   ```
 
+## Docker-compose setup
+
+The docker-compose setup has three containers: redis, ratelimit-build, and ratelimit. In order to run the docker-compose setup from the root of the repo, run
+
+```bash
+glide install
+docker-compose up
+```
+
+The ratelimit-build container will build the ratelimit binary. Then via a shared volume the binary will be shared with the ratelimit container. This dual container setup is used in order to use a
+a minimal container to run the application, rather than the heftier container used to build it.
+
+If you want to run with [two redis instances](#two-redis-instances), you will need to modify
+the docker-compose.yaml file to run a second redis container, and change the environment variables
+as explained in the [two redis instances](#two-redis-instances) section.
+
 # Configuration
 
 ## The configuration format

docker-compose.yml

@@ -6,27 +6,33 @@ services:
     expose:
       - 6379
     ports:
-      - "6379:6379"
+      - 6379:6379
     networks:
-      - data
+      - ratelimit-network
+
+  # minimal container that builds the ratelimit service binary and exits.
+  ratelimit-build:
+    image: golang:1.10-alpine
+    working_dir: /go/src/github.com/lyft/ratelimit
+    command: go build -o /usr/local/bin/ratelimit /go/src/github.com/lyft/ratelimit/src/service_cmd/main.go
     volumes:
-      - redis-data:/data
+      - .:/go/src/github.com/lyft/ratelimit
+      - binary:/usr/local/bin/
 
   ratelimit:
-    build:
-      context: ./
-      dockerfile: Dockerfile
+    image: alpine:3.6
+    command: /usr/local/bin/ratelimit
     ports:
       - 8080:8080
       - 6070:6070
     depends_on:
       - redis
+      - ratelimit-build
     networks:
-      - data
-    links:
-      - redis
+      - ratelimit-network
     volumes:
-      - ./examples:/data/
+      - binary:/usr/local/bin/
+      - ./examples:/data
     environment:
       - USE_STATSD=false
       - LOG_LEVEL=debug
@@ -36,8 +42,7 @@ services:
       - RUNTIME_SUBDIRECTORY=ratelimit
 
 networks:
-  data:
+  ratelimit-network:
 
 volumes:
-  redis-data:
-  ratelimit-data:
+  binary: