fixing healthcheck rollbacks, adding TAG to deploys, adding missing yml

docs/index.html

@@ -4620,9 +4620,9 @@ class: extra-details
 
 ---
 
-name: healthchecks
+name: healthcheck
 
-class: healthchecks
+class: healthcheck
 
 # Health checks
 
@@ -4644,7 +4644,7 @@ class: healthchecks
 
 ---
 
-class: healthchecks
+class: healthcheck
 
 ## Defining health checks
 
@@ -4748,7 +4748,7 @@ class: healthcheck
 
 - Go to the `stacks` directory:
   ```bash
-  cd ~/orchestration-workshop/
+  cd ~/orchestration-workshop/stacks
   ```
 
 - Deploy the updated stack:
@@ -4777,10 +4777,10 @@ First, let's make an "innocent" change and deploy it.
 
 - Build, ship, and run the new image:
   ```bash
-  docker-compose -f dockercoins+healthchecks.yml build
+  export TAG=v0.3; docker-compose -f dockercoins+healthchecks.yml build
   docker-compose -f dockercoins+healthchecks.yml push
   docker service update dockercoins_hasher \
-           --detach=false --image=127.0.0.1:5000/hasher:latest
+           --detach=false --image=127.0.0.1:5000/hasher:$TAG
   ```
 
 ]
@@ -4802,10 +4802,10 @@ And now, a breaking change that will cause the health check to fail:
 
 - Build, ship, and run the new image:
   ```bash
-  docker-compose -f dockercoins+healthchecks.yml build
+  export TAG=v0.4; docker-compose -f dockercoins+healthchecks.yml build
   docker-compose -f dockercoins+healthchecks.yml push
   docker service update dockercoins_hasher \
-           --detach=false --image=127.0.0.1:5000/hasher:latest
+           --detach=false --image=127.0.0.1:5000/hasher:$TAG
   ```
 
 ]

stacks/dockercoins+healthcheck.yml

@@ -0,0 +1,36 @@
+version: "3"
+
+services:
+  rng:
+    build: dockercoins/rng
+    image: ${REGISTRY-127.0.0.1:5000}/rng:${TAG-latest}
+    deploy:
+      mode: global
+
+  hasher:
+    build: dockercoins/hasher
+    image: ${REGISTRY-127.0.0.1:5000}/hasher:${TAG-latest}
+    deploy:
+      replicas: 7
+      update_config:
+        delay: 5s
+        failure_action: rollback
+        max_failure_ratio: .5
+        monitor: 5s
+        parallelism: 1
+
+  webui:
+    build: dockercoins/webui
+    image: ${REGISTRY-127.0.0.1:5000}/webui:${TAG-latest}
+    ports:
+    - "8000:80"
+
+  redis:
+    image: redis
+
+  worker:
+    build: dockercoins/worker
+    image: ${REGISTRY-127.0.0.1:5000}/worker:${TAG-latest}
+    deploy:
+      replicas: 10
+