docker: Apline configure timezone

Container docker based on Alpine Linux uses standard timezone UTC, if in your case needed any other timezone you must to follow 2 steps

1. In docker startup command add environment varialbe -e TZ="Europe/Kiev" (ofc change timezone to your’s). Full line for example.

   docker run --name containername -d \
         -e TZ="Europe/Kiev" \
         nginx:alpine

   But it works only when tzdata package already installed in the image, for example in the nginx image tzdata already installed.

2. If you build image from clear alpine:latest – you need to install tzdata, here are example of Dockerfile

   FROM alpine:latest
   
   RUN apk update && \
       apk add --no-cache tzdata
   
   ENTRYPOINT ["date"]
   

   An example of production Dockerfile, based on python image that used alpine for my flask application, here I installing some requirements and tzdata.

   FROM python:3.7-alpine
   
   WORKDIR /home/app
   COPY app app
   COPY migrations migrations
   COPY config.py requirements.txt run.py run.sh ./
   
   RUN python -m venv venv
   
   RUN apk update && \
       apk add --no-cache --virtual build-deps gcc python3-dev musl-dev postgresql-dev && \
       apk add --no-cache postgresql-dev tzdata && \
       venv/bin/pip install --no-cache-dir psycopg2-binary gunicorn && \
       apk del --no-cache build-deps
   
   RUN venv/bin/pip install -r requirements.txt
   
   
   RUN chmod +x run.sh
   ENV FLASK_APP run.py
   EXPOSE 5000
   
   ENTRYPOINT ["./run.sh"]