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How to use Docker compose in c program?

I want to isolate my development environment to create a project in C. But I don’t know how to use Docker with C. I’m getting confused about running the program and I would like someone to help me. Take for example a "hello world" with an input. basic as a program. How can I make a docker compose and how to run it. And still with live-reload?

hello.c:

#include <stdio.h>
int main() {
  int numero;

  // Pede um número ao usuário
  printf("Digite um número: ");
  scanf("%d", &numero);

  // Exibe o número digitado na tela
  printf("O número digitado foi: %dn", numero);

  return 0;
}

Dockerfile:

FROM gcc:latest

COPY . /app

WORKDIR /app/

RUN gcc -o app hello.c

CMD [“./app"]
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2

Answers


  1. 0

    CMD ["./app"]

    Try this as a CMD command in Dockerfile. I found “ in your CMD makes docker build fail.

    In addition, you don’t want to copy source codes and build docker images every time you make changes on your project.

    You can also consider using bind mount or docker volume to share directories across native host and containers.

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  2. 0

    It’s good practice (although not required) to treat containers as immutable.

    In this scenario, whenever your code changes, you rebuild and create a uniquely new image.

    There are various ways to work with mutable containers:

    1. Use a container interactively e.g. Bash to edit the code, compile it etc.
    2. Mount host files into a container (possibly in combination with #1)
    3. Copy files in|out of a running container

    Some combination of these approaches may serve your needs but be careful to ensure you do so correctly so that you persist changes to files in the container:

    You can create an interactive shell on a container from the gcc:latest image and mount files e.g. your source code into a folder on it:

    WORK="/app"

docker run 
--interactive --tty --rm 
--volume=${PWD}/hello.c:${WORK}/hello.c 
--workdir=${WORK} 
gcc:latest

    This will mount ${PWD}/hello.c into the container’s /app folder and make this the working directory.

    When you run the docker command, you should see:

    # ls
hello.c

    You can then:

    # gcc -o hello hello.c
# ls 
hello hello.c
# ./hello
Digite um número: 55
O número digitado foi: 55

    Any changes you make to hello.c (only) will be reflected in the copy on your host.

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