Backport #92 (thanks @bretfisher 👍🏻)

docs/healthchecks.md

@@ -1,7 +1,5 @@
 name: healthchecks
 
-class: healthchecks
-
 # Health checks
 
 (New in Docker Engine 1.12)
@@ -22,8 +20,6 @@ class: healthchecks
 
 ---
 
-class: healthchecks
-
 ## Defining health checks
 
 - In a Dockerfile, with the [HEALTHCHECK](https://docs.docker.com/engine/reference/builder/#healthcheck) instruction
@@ -48,8 +44,6 @@ class: healthchecks
 
 ---
 
-class: healthcheck
-
 ## Using health checks
 
 - With `docker run`, health checks are purely informative
@@ -67,8 +61,6 @@ class: healthcheck
 
 ---
 
-class: healthcheck
-
 ## Automated rollbacks
 
 Here is a comprehensive example using the CLI:
@@ -94,8 +86,6 @@ docker service update \
 
 ---
 
-class: healthcheck
-
 ## Implementing auto-rollback in practice
 
 We will use the following Compose file (`stacks/dockercoins+healthchecks.yml`):
@@ -118,15 +108,13 @@ We will use the following Compose file (`stacks/dockercoins+healthchecks.yml`):
 
 ---
 
-class: healthcheck
-
 ## Enabling auto-rollback
 
 .exercise[
 
 - Go to the `stacks` directory:
   ```bash
-  cd ~/orchestration-workshop/
+  cd ~/orchestration-workshop/stacks
   ```
 
 - Deploy the updated stack:
@@ -140,8 +128,6 @@ This will also scale the `hasher` service to 7 instances.
 
 ---
 
-class: healthcheck
-
 ## Visualizing a rolling update
 
 First, let's make an "innocent" change and deploy it.
@@ -155,18 +141,17 @@ First, let's make an "innocent" change and deploy it.
 
 - Build, ship, and run the new image:
   ```bash
+  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
   ```
 
 ]
 
 ---
 
-class: healthcheck
-
 ## Visualizing an automated rollback
 
 And now, a breaking change that will cause the health check to fail:
@@ -180,18 +165,17 @@ And now, a breaking change that will cause the health check to fail:
 
 - Build, ship, and run the new image:
   ```bash
+  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
   ```
 
 ]
 
 ---
 
-class: healthcheck
-
 ## Command-line options available for health checks, rollbacks, etc.
 
 Batteries included, but swappable

stacks/dockercoins+healthchecks.yml

@@ -0,0 +1,35 @@
+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