Dockerizace! (zatím alespoň pro lokální vývoj) #37
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36
Dockerfile
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36
Dockerfile
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FROM python:3.9.18-slim-bullseye
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# set work directory
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WORKDIR /usr/mamweb-docker
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# set environment variables
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ENV PIP_DISABLE_PIP_VERSION_CHECK 1
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ENV PYTHONDONTWRITEBYTECODE 1
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ENV PYTHONUNBUFFERED 1
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# install dependencies
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RUN apt-get update && apt-get install -y \
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libpq-dev \
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gcc \
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locales \
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imagemagick \
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netcat \
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postgresql-client
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RUN pip install --upgrade pip
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COPY ./requirements.txt .
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COPY ./constraints.txt .
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RUN pip install -r requirements.txt
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# allow correct locales
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RUN sed -i '/cs_CZ.UTF-8/s/^# //g' /etc/locale.gen && \
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locale-gen
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ENV LANG cs_CZ.UTF-8
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ENV LANGUAGE en_US:en
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ENV LC_ALL cs_CZ.UTF-8
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# copy project
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COPY . .
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# create test data once db is ready
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RUN chmod +x /usr/mamweb-docker/docker_entrypoint.sh
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ENTRYPOINT ["/usr/mamweb-docker/docker_entrypoint.sh"]
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23
docker-compose.yml
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23
docker-compose.yml
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services:
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web:
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build: .
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command: python manage.py runserver 0.0.0.0:8000
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volumes:
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- .:/usr/mamweb-docker
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ports:
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- 8000:8000
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depends_on:
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- db
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db:
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image: postgres:13-bullseye
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volumes:
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- postgres_data:/var/lib/postgresql/data/
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environment:
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- POSTGRES_USER=mam-web
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- POSTGRES_PASSWORD=RoEGG5g7&b # Random generated string corresponding with Django settings
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- POSTGRES_DB=mam_docker
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volumes:
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postgres_data:
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19
docker_entrypoint.sh
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docker_entrypoint.sh
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#!/bin/sh
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echo "Waiting for Postgres..."
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while ! nc -z "db" "5432"; do
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sleep 0.1
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done
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echo "PostgreSQL started"
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PGPASSWORD="RoEGG5g7&b" # Random generated, corresponds to the one in docker-compose.yml
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if psql "postgresql://mam-web:$PGPASSWORD@db:5432/mam_docker" -t -c '\dt' | cut -d \| -f 2 | grep -qw "seminar_cisla"; then
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echo "\nExistuje tabulka 'seminar_cisla' v db, testdata pravděpodobně byla vygenerována.\n"
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else
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python ./manage.py testdata
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python ./manage.py loaddata data/*
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fi
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exec "$@"
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15
docs/docker.rst
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15
docs/docker.rst
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Lokální vývoj pomocí dockeru
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============================
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Přijde vám standardní zprovoznění painful? Docker comes to the rescue. Stačí mít nainstalovaný ``docker`` a spustit ``docker compose up``.
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Co se děje under the hood
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-------------------------
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- ``docker-compose.yml`` specifikuje, že chceme kontejner pro web, který je závislý na kontejneru s PostgreSQL db
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- ``web`` se buildí z ``Dockerfilu``, mountuje si kořen repa jako svůj volume (takže vidí změny), na konci spouští webserver a vysatvuje ho na port 8000 localhosta
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- ``db`` je z ``postgres:13-bullseye`` a má nastavené nějaké parametry, svoje data ukládá jako docker volume
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- ``Dockerfile`` staví ``web`` na pythonu3.9 a debianu bullseye (mělo by odpovídat gimlimu) - nainstaluje dependencies, nastaví locale a entrypoint (co se má vykonat při spouštění kontejneru)
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- ``docker_entrypoint.sh`` počká na Postgres ready v ``db``, podívá se jestli jsou v něm testdata a když ne, tak je vygeneruje, pak spustí command z compose (i.e. webserver)
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- ``mamweb/settings.py`` vybere django settings podle cesty (jako doteď), vybere ``mamweb/settings_docker.py``, které importuje všechno z ``mamweb/settings_local.py``, přepíše jen ``DATABASES`` a ``SECRET_KEY``, aby se jako DB Engine používal Postgres ve vedlejším kontejneru, aby se celý web choval stejně jako ``_test`` a ``_prod`` (``_local`` aktuálně používá DB Engine sqlite3, které se v něčem chová trochu rozdílně)
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- kontejner ``web`` se musí nějak připojovat k postgresu v ``db``, k tomu slouží user ``mam-web``, náhodně vygenerované heslo (v ``docker-compose.yml`` a ``docker_entrypoint.sh``, musí se shodovat), db se jmenuje ``mam_docker``
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@ -14,6 +14,9 @@ if "mamweb-test" in os.path.abspath(__file__):
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elif "mamweb-prod" in os.path.abspath(__file__):
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from .settings_prod import *
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elif "mamweb-docker" in os.path.abspath(__file__):
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from .settings_docker import *
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else:
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from .settings_local import *
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33
mamweb/settings_docker.py
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mamweb/settings_docker.py
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# -*- coding: utf-8 -*-
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#
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# Docker nastaveni settings.py
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#
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# Pro vyber tohoto nastaveni muzete pouzit tez:
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# DJANGO_SETTINGS_MODULE=mamweb.settings_docker ./manage.py ...
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#
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# Import common settings
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from .settings_common import * # zatim nutne, casem snad vyresime # noqa
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from mamweb.settings_local import * # Import all the settings for local development
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# SECURITY WARNING: keep the secret key used in production secret!
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SECRET_KEY = 'EZfSzeuDCycKr5ZjiCQ^45ZqFU@8Ke#YDwn9ThqerfEpu^yV#p'
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# Database
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# https://docs.djangoproject.com/en/1.7/ref/settings/#databases
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DATABASES = {
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'default': {
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'ENGINE': 'django.db.backends.postgresql_psycopg2',
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'NAME': 'mam_docker',
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'USER': 'mam-web',
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'PASSWORD': 'RoEGG5g7&b', # Random generated string corresponding with docker-compose
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'TEST': {
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'NAME': 'mam-docker-testdb',
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},
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"HOST": "db",
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"PORT": "5432",
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},
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}
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