Image and Container Exercises - Paying Attention to Dockerfile Details

Exercises around image building and management

Step 1: Build & Run with the Original Dockerfile

FROM mjmckay.jfrog.io/app-docker/myalpine:latest

WORKDIR /app

RUN wget https://raw.githubusercontent.com/mjmckay/legendary-giggle/main/helloworld.c

RUN gcc -o hello helloworld.c

CMD ["./hello"]

Step 2: Use an Official Base Image!

FROM alpine

RUN apk add --no-cache wget gcc musl-dev # buildkit

WORKDIR /app

RUN wget https://raw.githubusercontent.com/mjmckay/legendary-giggle/main/helloworld.c

RUN gcc -o hello helloworld.c

CMD ["./hello"]

Step 3: Don't Rely on External Resources

FROM alpine

RUN apk add --no-cache wget gcc musl-dev # buildkit

WORKDIR /app

COPY resources/helloworld.c .

RUN gcc -o hello helloworld.c

CMD ["./hello"]

Step 4: Manage Your Repositories

FROM [DOCKER REGISTRY]/[DOCKER REPO]/alpine

RUN apk add --no-cache wget gcc musl-dev # buildkit

WORKDIR /app

COPY resources/helloworld.c .

RUN gcc -o hello helloworld.c

CMD ["./hello"]