Base Django images out of Alpine 3.3

.travis.yml

@@ -2,7 +2,7 @@ language: bash
 services: docker
 
 env:
-  - PY_VERSION=3.4
+  - PY_VERSION=3.5
   - PY_VERSION=2.7
 
 install:

2.7/Dockerfile

@@ -1,13 +1,14 @@
-FROM python:2.7-slim
-
-RUN apt-get update && apt-get install -y \
-		gcc \
-		gettext \
-		mysql-client libmysqlclient-dev \
-		postgresql-client libpq-dev \
-		sqlite3 \
-	--no-install-recommends && rm -rf /var/lib/apt/lists/*
+FROM alpine:3.4
 
 ENV DJANGO_VERSION 1.10.3
 
-RUN pip install mysqlclient psycopg2 django=="$DJANGO_VERSION"
+RUN apk add --update-cache \
+            bash py-pip \
+            mariadb-libs libpq sqlite && \
+    apk add --virtual=build-deps \
+            gcc musl-dev python-dev \
+            mariadb-dev postgresql-dev && \
+    pip install mysqlclient \
+                psycopg2 \
+                django=="$DJANGO_VERSION" && \
+    apk del build-deps && rm -rf /var/cache/apk/*

2.7/onbuild/Dockerfile

@@ -1,20 +1,20 @@
-FROM python:2.7
+FROM alpine:3.3
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD COPY requirements.txt /usr/src/app/
-ONBUILD RUN pip install --no-cache-dir -r requirements.txt
+ONBUILD RUN apk add --virtual=build-deps --update-cache \
+                    gcc musl-dev python-dev \
+                    mariadb-dev postgresql-dev && \
+            pip install --no-cache-dir -r requirements.txt && \
+            apk del build-deps && rm -rf /var/cache/apk/*
 
 ONBUILD COPY . /usr/src/app
 
-RUN apt-get update && apt-get install -y \
-		gcc \
-		gettext \
-		mysql-client libmysqlclient-dev \
-		postgresql-client libpq-dev \
-		sqlite3 \
-	--no-install-recommends && rm -rf /var/lib/apt/lists/*
+RUN apk add --update-cache \
+            bash py-pip \
+            mariadb-libs libpq sqlite && rm -rf /var/cache/apk/*
 
 EXPOSE 8000
 CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]

3.5/Dockerfile

@@ -0,0 +1,19 @@
+FROM alpine:3.4
+
+ENV DJANGO_VERSION 1.10.3
+
+RUN apk add --update-cache \
+            bash python3 \
+            mariadb-libs libpq sqlite && \
+    apk add --virtual=build-deps \
+            gcc musl-dev python3-dev \
+            wget ca-certificates \
+            mariadb-dev postgresql-dev && \
+    wget https://bootstrap.pypa.io/get-pip.py --no-verbose --output-document - | \
+         python3 && \
+    pip install mysqlclient \
+                psycopg2 \
+                django=="$DJANGO_VERSION" && \
+    apk del build-deps && rm -rf /var/cache/apk/*
+
+RUN cd /usr/bin && ln -sf python3 python

3.5/onbuild/Dockerfile

@@ -0,0 +1,28 @@
+FROM alpine:3.3
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+ONBUILD COPY requirements.txt /usr/src/app/
+ONBUILD RUN apk add --virtual=build-deps --update-cache \
+                    gcc musl-dev python3-dev \
+                    mariadb-dev postgresql-dev && \
+            pip install --no-cache-dir -r requirements.txt && \
+            apk del build-deps && rm -rf /var/cache/apk/*
+
+ONBUILD COPY . /usr/src/app
+
+# A bug in Alpine ca-certificates package requires installing openssl-dev as well
+RUN apk add --update-cache \
+            bash python3 \
+            mariadb-libs libpq sqlite && \
+    apk add --virtual=pip-deps \
+            wget ca-certificates openssl-dev && \
+    wget https://bootstrap.pypa.io/get-pip.py --no-verbose --output-document - | \
+         python3 && \
+    apk del pip-deps && rm -rf /var/cache/apk/*
+
+RUN cd /usr/bin && ln -sf python3 python
+
+EXPOSE 8000
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]