Chapter 17: Docker support (17d)

Dockerfile

@@ -0,0 +1,21 @@
+FROM python:3.6-alpine
+
+ENV FLASK_APP flasky.py
+ENV FLASK_CONFIG production
+
+RUN adduser -D flasky
+USER flasky
+
+WORKDIR /home/flasky
+
+COPY requirements requirements
+RUN python -m venv venv
+RUN venv/bin/pip install -r requirements/docker.txt
+
+COPY app app
+COPY migrations migrations
+COPY flasky.py config.py boot.sh ./
+
+# run-time configuration
+EXPOSE 5000
+ENTRYPOINT ["./boot.sh"]

boot.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+source venv/bin/activate
+flask deploy
+exec gunicorn -b :5000 --access-logfile - --error-logfile - flasky:app

config.py

@@ -86,11 +86,25 @@ def init_app(cls, app):
         app.logger.addHandler(file_handler)
 
 
+class DockerConfig(ProductionConfig):
+    @classmethod
+    def init_app(cls, app):
+        ProductionConfig.init_app(app)
+
+        # log to stderr
+        import logging
+        from logging import StreamHandler
+        file_handler = StreamHandler()
+        file_handler.setLevel(logging.INFO)
+        app.logger.addHandler(file_handler)
+
+
 config = {
     'development': DevelopmentConfig,
     'testing': TestingConfig,
     'production': ProductionConfig,
     'heroku': HerokuConfig,
+    'docker': DockerConfig,
 
     'default': DevelopmentConfig
 }

requirements/docker.txt

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+-r common.txt
+gunicorn==19.7.1