container.training/slides/containers/Exercise_Dockerfile_Basic.md

Exercise — writing Dockerfiles

Let's write Dockerfiles for an existing application!

1. Check out the code repository

2. Read all the instructions

3. Write Dockerfiles

4. Build and test them individually

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Code repository

Clone the repository available at:

https://github.com/jpetazzo/wordsmith

It should look like this:

├── LICENSE
├── README
├── db/
│   └── words.sql
├── web/
│   ├── dispatcher.go
│   └── static/
└── words/
    ├── pom.xml
    └── src/

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Instructions

The repository contains instructions in English and French.
For now, we only care about the first part (about writing Dockerfiles).
Place each Dockerfile in its own directory, like this:

├── LICENSE
├── README
├── db/
│   ├── `Dockerfile`
│   └── words.sql
├── web/
│   ├── `Dockerfile`
│   ├── dispatcher.go
│   └── static/
└── words/
    ├── `Dockerfile`
    ├── pom.xml
    └── src/

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Build and test

Build and run each Dockerfile individually.

For db, we should be able to see some messages confirming that the data set was loaded successfully (some INSERT lines in the container output).

For web and words, we should be able to see some message looking like "server started successfully".

That's all we care about for now!

Bonus question: make sure that each container stops correctly when hitting Ctrl-C.

???

Test with a Compose file

Place the following Compose file at the root of the repository:

version: "3"
services:
  db:
    build: db
  words:
    build: words
  web:
    build: web
    ports:
    - 8888:80

Test the whole app by bringin up the stack and connecting to port 8888.