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Creating an image with A Dockerfile

 ·  1 min read

The Dockerfile

Simply a file or manifest that has all the commands needed to be run to create an image when you run ‘docker build’. You can find more information here: Dockerfile docs

Simple Dockerfile

Just to keep it simple a Dockerfile can be as simple as installing packages after setting up a server and creating some directories. Here’s an example:

FROM alpine:latest
RUN apk add --no-cache \
openrc && \
mkdir -p /opt/app && \
chmod -R 777 /opt/app

Here is a Dockerfile I used for a virtual host apache image:
https://github.com/mfung/alpine_apache2_php7

Commands

Some commands when dealing with building an image:

# here is an example I used to build my alpine erlang elixir phoenix image
docker build --no-cache --compress --squash -t mengfung/alpine-erlang-elixir-phoenix:latest -t mengfung/alpine-erlang-elixir-phoenix:v0.0.1 .
# to push up my images to hub.docker.com
docker push