Chapter 19: Deployment on Docker Containers (v0.19)

Dockerfile

@@ -0,0 +1,23 @@
+FROM python:slim
+
+RUN useradd microblog
+
+WORKDIR /home/microblog
+
+COPY requirements.txt requirements.txt
+RUN python -m venv venv
+RUN venv/bin/pip install -r requirements.txt
+RUN venv/bin/pip install gunicorn pymysql cryptography
+
+COPY app app
+COPY migrations migrations
+COPY microblog.py config.py boot.sh ./
+RUN chmod a+x boot.sh
+
+ENV FLASK_APP microblog.py
+
+RUN chown -R microblog:microblog ./
+USER microblog
+
+EXPOSE 5000
+ENTRYPOINT ["./boot.sh"]

boot.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+# this script is used to boot a Docker container
+source venv/bin/activate
+while true; do
+    flask db upgrade
+    if [[ "$?" == "0" ]]; then
+        break
+    fi
+    echo Deploy command failed, retrying in 5 secs...
+    sleep 5
+done
+flask translate compile
+exec gunicorn -b :5000 --access-logfile - --error-logfile - microblog:app

requirements.txt

@@ -38,5 +38,5 @@ Werkzeug==2.0.1
 WTForms==2.3.3
 
 # requirements for Heroku
-psycopg2==2.9.1
-gunicorn==20.1.0
+#psycopg2==2.9.1
+#gunicorn==20.1.0