completed chapter 14

Author: Travis Spangle

Docker for Rails.md

@@ -186,3 +186,7 @@ We can scale our intansted with
 I'm wondering if there's a way we can respond to the request load to auto scale these instances.
 
 This chapter was awesome! Being able to deploy to a virtual box allows me to practice and learn these commands before going into a production environment.
+
+## Chapter 14
+
+I'm impressed with docker-machine. I have a long history of sys admin / dev ops. Some of my previous positions have been 30%+ provisioning and maintaining servers. With these tools I could knock that down to less than 10%. This book doesn't cover swarm that much but in previous courses I've configured it to stop instances consuming too many resources and starting fresh.

myapp/docker-stack.yml

@@ -9,6 +9,8 @@ services:
     env_file:
       - .env/production/database
       - .env/production/web
+    deploy:
+      replicas: 2
 
   redis:
     image: redis
@@ -20,6 +22,16 @@ services:
     volumes:
       - db_data:/var/lib/postgresql/data
 
+  visualizer:
+    image: dockersamples/visualizer:stable
+    ports:
+      - "8080:8080"
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock"
+    deploy:
+      placement:
+        constraints: [node.role == manager]
+
   db-migrator:
     image: presstheredbutton/myapp_web:prod
     command: ["./wait-for", "--timeout=300", "database:5432", "--",