Personalize The Greeting

Part of the Introduction to Docker section of Coddy's Terminal journey — lesson 36 of 40.

Challenge

Medium

Make the greeting read from a file you ship inside the image. A file named name.txt (containing a user's name) is already in your directory. Run these commands one after the other:

Write a Dockerfile: FROM alpine, then COPY name.txt /name.txt, then CMD ["cat", "/name.txt"]
Build it tagged greetapp
Run it so the name prints

Try it yourself

Terminal

cat > Dockerfile << 'EOF'
FROM alpine
CMD ["echo", "Welcome to the greeting app"]
EOF
docker build -t greetapp .
docker run greetapp

All lessons in Introduction to Docker

1Introduction

What Is Docker Images And Containers

4Managing Containers

Naming Containers Detached Containers Listing All Containers Stopping And Removing Recap - Container Lifecycle

7Files In Images

The COPY Instruction The WORKDIR Instruction Recap - Package It Up

10Greeting App Project

Project Overview Write The Dockerfile

Build And Run

Personalize The Greeting Project lesson

Ship A Tagged Version

2Images

Pulling Images Listing Images Tagging Images Recap - Image Wrangler

5Inspecting Containers

Container Logs Inspecting Details Executing Commands Recap - Health Check

8Copying Files

Copy Into A Container Copy Out Of A Container

11Final Challenges

Distro Detective Full Build Pipeline Runtime File Drop

3Running Containers

Running A Command Real Execution Different Distros Auto-Remove Containers Recap - Container Runner

6Building Images

What Is A Dockerfile Building An Image The CMD Instruction Recap - Image Builder

9Volumes & Networks

Volumes Networks Recap - Managing Resources