Use smaller images (Node.js, Python, Ruby) (#1749)

Author: PicardParis

docs/serving/samples/hello-world/helloworld-nodejs/Dockerfile

@@ -1,6 +1,6 @@
-# Use the official Node.js 12 image.
+# Use the official lightweight Node.js 12 image.
 # https://hub.docker.com/_/node
-FROM node:12
+FROM node:12-slim
 
 # Create and change to the app directory.
 WORKDIR /usr/src/app
@@ -14,7 +14,7 @@ COPY package*.json ./
 RUN npm install --only=production
 
 # Copy local code to the container image.
-COPY . .
+COPY . ./
 
 # Run the web service on container startup.
 CMD [ "npm", "start" ]

docs/serving/samples/hello-world/helloworld-nodejs/README.md

@@ -95,9 +95,9 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-nodejs
    [Dockerizing a Node.js web app](https://nodejs.org/en/docs/guides/nodejs-docker-webapp/).
 
    ```Dockerfile
-   # Use the official Node.js 12 image.
+   # Use the official lightweight Node.js 12 image.
    # https://hub.docker.com/_/node
-   FROM node:12
+   FROM node:12-slim
 
    # Create and change to the app directory.
    WORKDIR /usr/src/app
@@ -111,7 +111,7 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-nodejs
    RUN npm install --only=production
 
    # Copy local code to the container image.
-   COPY . .
+   COPY . ./
 
    # Run the web service on container startup.
    CMD [ "npm", "start" ]

docs/serving/samples/hello-world/helloworld-python/Dockerfile

@@ -1,11 +1,11 @@
 # Use the official Python image.
 # https://hub.docker.com/_/python
-FROM python:3.7
+FROM python:3.7-slim
 
 # Copy local code to the container image.
 ENV APP_HOME /app
 WORKDIR $APP_HOME
-COPY . .
+COPY . ./
 
 # Install production dependencies.
 RUN pip install Flask gunicorn

docs/serving/samples/hello-world/helloworld-python/README.md

@@ -58,14 +58,14 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-python
    details.
 
    ```docker
-   # Use the official Python image.
+   # Use the official lightweight Python image.
    # https://hub.docker.com/_/python
-   FROM python:3.7
+   FROM python:3.7-slim
 
    # Copy local code to the container image.
    ENV APP_HOME /app
    WORKDIR $APP_HOME
-   COPY . .
+   COPY . ./
 
    # Install production dependencies.
    RUN pip install Flask gunicorn

docs/serving/samples/hello-world/helloworld-ruby/Dockerfile

@@ -1,6 +1,6 @@
-# Use the official Ruby image.
+# Use the official lightweight Ruby image.
 # https://hub.docker.com/_/ruby
-FROM ruby:2.5
+FROM ruby:2.5-slim
 
 # Install production dependencies.
 WORKDIR /usr/src/app
@@ -9,7 +9,7 @@ ENV BUNDLE_FROZEN=true
 RUN bundle install
 
 # Copy local code to the container image.
-COPY . .
+COPY . ./
 
 # Run the web service on container startup.
 CMD ["ruby", "./app.rb"]

docs/serving/samples/hello-world/helloworld-ruby/README.md

@@ -53,9 +53,9 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-ruby
    details.
 
    ```docker
-   # Use the official Ruby image.
+   # Use the official lightweight Ruby image.
    # https://hub.docker.com/_/ruby
-   FROM ruby:2.5
+   FROM ruby:2.5-slim
 
    # Install production dependencies.
    WORKDIR /usr/src/app
@@ -64,7 +64,7 @@ cd knative-docs/docs/serving/samples/hello-world/helloworld-ruby
    RUN bundle install
 
    # Copy local code to the container image.
-   COPY . .
+   COPY . ./
 
    # Run the web service on container startup.
    CMD ["ruby", "./app.rb"]