Compose build+push

dockercoins/docker-compose.yml-images

@@ -0,0 +1,30 @@
+version: "2"
+
+services:
+  rng:
+    build: rng
+    image: ${REPOSITORY_SLASH}rng${COLON_TAG}
+    ports:
+    - "8001:80"
+
+  hasher:
+    build: hasher
+    image: ${REPOSITORY_SLASH}hasher${COLON_TAG}
+    ports:
+    - "8002:80"
+
+  webui:
+    build: webui
+    image: ${REPOSITORY_SLASH}webui${COLON_TAG}
+    ports:
+    - "8000:80"
+    volumes:
+    - "./webui/files/:/files/"
+
+  redis:
+    image: redis
+
+  worker:
+    build: worker
+    image: ${REPOSITORY_SLASH}worker${COLON_TAG}
+

www/htdocs/index.html

@@ -3027,6 +3027,101 @@ Note: the `local` volume driver automatically creates volumes.
 
 Note: we could keep the volume around if we wanted.
 
+---
+
+# Scripting image building and pushing
+
+- Earlier, we used some rather crude shell loops to build and push images
+
+- Compose (and clever environment variables) can help us to make that easier
+
+- When using Compose file version 2, you can specify *both* `build` and `image`:
+
+```yaml
+version: "2"
+
+services:
+
+  webapp:
+    build: src/
+    image: jpetazzo/webapp:${TAG}
+```
+
+Note: Compose tolerates empty (or unset) environment variables, but in this example,
+`TAG` *must* be set, because `jpetazzo/webapp:` is not a valid image name.
+
+---
+
+## Updating the Compose file to specify image tags
+
+- Let's update the Compose file for DockerCoins to make it easier to push it to our registry
+
+.exercise[
+
+- Go back to the `dockercoins` directory:
+  ```bash
+  cd ~/orchestration-workshop/dockercoins
+  ```
+
+- Edit `docker-compose.yml`, and update each service to add an `image` directive as follows:
+  ```yaml
+    rng:
+      build: rng
+      `image: ${REGISTRY_SLASH}rng${COLON_TAG}`
+  ```
+
+]
+
+You can also directly use the file `docker-compose.yml-images`.
+
+---
+
+## Use the new Compose file
+
+- We need to set `REGISTRY_SLASH` and `COLON_TAG` variables
+
+- Then we can use Compose to `build` and `push`
+
+.exercise[
+
+- Set environment variables:
+  ```bash
+  export REGISTRY_SLASH=localhost:5000/
+  export COLON_TAG=:v0.01
+  ```
+
+- Build and push with Compose:
+  ```bash
+  docker-compose build
+  docker-compose push
+  ```
+
+]
+
+---
+
+## Why the weird variable names?
+
+- It would be more intuitive to have:
+  ```bash
+  REGISTRY=localhost:5000
+  TAG=v0.01
+  ```
+
+- But then, when the variables are not set, the image names would be invalid
+
+  (they would look like .red[`/rng:`])
+
+- Putting the slash and the colon in the variables allows to use the Compose file
+  even when the variables are not set
+
+- The variable names (might) remind you that you have to put the trailing slash and heading colon
+
+---
+
+# Docker Application Bundles
+
+
 ---
 
 # Controlling Docker from a container