Automatically Setting Timezone on Dockerfile

As I lives in Indonesia, I would prefer to use GMT+7 as my selected timezone. It will make my log easier to check and also easier to find events at a certain time.

Below are a sample command to set timezone on Ubuntu based docker images :

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# Dockerfile for Excellent Ubuntu Standard

# Based on Ubuntu 18.04

# Created by Masim Vavai Sugianto

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FROM ubuntu:18.04

MAINTAINER Masim Vavai Sugianto <mynickname@vavai.net>
ARG DEBIAN_FRONTEND=noninteractive

RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections && apt-get update && apt-get install apt-utils tzdata

RUN echo "tzdata tzdata/Areas select Asia\ntzdata tzdata/Zones/Asia select Jakarta" > /tmp/tz ; debconf-set-selections /tmp/tz; rm /etc/localtime /etc/timezone; dpkg-reconfigure -f noninteractive tzdata