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--- marc:linux:docker [2022/04/18 10:22] – [Docker Compose:] marcv
+++ marc:linux:docker [2022/04/19 10:03] (current) – [2 phase container building:] marcv
@@ Line 248: / Line 248: @@
       - .:/app                                   # copy all from local working directory to app directory inside
                                                  # container (except /app/node_volumes!)
+    app3:
+      restart: never
+      build:
+        context: .                               # working directory
+        dockerfile: ./Dockerfile.dev             # define another file than default (Dockerfile)
+                                                 # it can also be a url to a git_directory
 </code>
@@ Line 297: / Line 303: @@
 {{:marc:linux:github_workflow.png?direct&800|}}
+===== 2 phase container building: =====
+By using a multiphase build we can:
+  - Use multiple images
+  - Reduce space by only copying the needed contents to the final container
+{{:marc:linux:multi_phase_build.png?direct&800|}}
+The __Dockerfile__ would look something like this:
+<code>
+FROM node:alpine as builder        # Using "as" we can tag this phase
+WORKDIR '/app'
+COPY package.json .
+RUN npm install
+COPY . .
+RUN npm run build                  # This creates the content we want to serve in the /app/build directory
+FROM nginx                         # Not using another tag; we differentiate the phases using "FROM"
+COPY --from=builder /app/build /usr/share/nginx/html
+</code>
+Notice we did not define the RUN command; this is not needed as this container will start nginx itself.