Chapter 4

Here are some sample answers to the questions presented in this chapter:

1. The Dockerfile could look like this:

FROM ubuntu:19.04
RUN apt-get update && \
    apt-get install -y iputils-ping
CMD ping 127.0.0.1

Note that in Ubuntu, the ping tool is part of the iputils-ping package. Build the image called pinger—for example— with docker image build -t my-pinger. 

2. The Dockerfile could look like this:

FROM alpine:latest
RUN apk update && \
    apk add curl

Build the image with docker image build -t my-alpine:1.0. 

3. The Dockerfile for a Go application could look like this:

FROM golang:alpine
WORKDIR /app
ADD . /app
RUN cd /app && go build -o goapp
ENTRYPOINT ./goapp

You can find the full solution in the ~/fod/ch04/answer03 folder. 

4. A Docker image...