C++ with Crow, CMake, and Docker [closed] - c++

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Goal
I would like to compile an Crow Project with CMake and deploy it in a docker container.
Code
So far, I compiled in Visual Studio and installed Crow via VCPKG similar to this Tutorial.
example main.cpp from Crow website:
#include "crow.h"
//#include "crow_all.h"
int main()
{
crow::SimpleApp app; //define your crow application
//define your endpoint at the root directory
CROW_ROUTE(app, "/")([](){
return "Hello world";
});
//set the port, set the app to run on multiple threads, and run the app
app.port(18080).multithreaded().run();
}
I want to build my docker image with docker build -t main_app:1 . and then run a container with docker run -d -it -p 443:18080 --name app main_app:1.
Therefore, I considered something similar like this:
Dockerfile:
FROM ubuntu:latest
RUN apt-get update -y
RUN apt-get upgrade -y
# is it necessary to install all of them?
RUN apt-get install -y g++ gcc cmake make git gdb pkg-config
RUN git clone --depth 1 https://github.com/microsoft/vcpkg
RUN ./vcpkg/bootstrap-vcpkg.sh
RUN /vcpkg/vcpkg install crow
CMakeLists.txt:
cmake_minimum_required(VERSION 3.8)
project(project_name)
include(/vcpkg/scripts/buildsystems/vcpkg.cmake)
find_package(Crow CONFIG REQUIRED)
add_executable(exe_name "main.cpp")
target_link_libraries(exe_name PUBLIC Crow::Crow)
Questions
However, obviously this is not complete and thus will not work. Hence, I would like to know how a proper (and simple) Dockerfile and CMakeLists.txt would look like for this main.cpp?
Is it possible to create my image without VCPKG? I am a little bit concerned about my image and container size, here.
How would it work with the crow_all.h header only file?
Is it possible to build an image from an already compiled name.exe, as well - so I won't have to compile anything while building the image?
Since this ought to be a minimal example, would there be any conflicts with a file structure like this:
docker_project
|__Dockerfile
|__CMakeLists.txt
|__header.hpp
|__class.cpp
|__main.cpp
Thanks for your help :)

Answer 1

After further research and testing I could solve this issue on two ways:
Crow.h Project compiled with CMake in Docker container
Dockerfile
# get baseimage
FROM ubuntu:latest
RUN apt-get update -y
RUN apt-get upgrade -y
# reinstall certificates, otherwise git clone command might result in an error
RUN apt-get install --reinstall ca-certificates -y
# install developer dependencies
RUN apt-get install -y git build-essential cmake --no-install-recommends
# install vcpkg package manager
RUN git clone https://github.com/microsoft/vcpkg
RUN apt-get install -y curl zip
RUN vcpkg/bootstrap-vcpkg.sh
# install crow package
RUN /vcpkg/vcpkg install crow
# copy files from local directory to container
COPY . /project
# define working directory from container
WORKDIR /build
# compile with CMake
RUN bash -c "cmake ../project && cmake --build ."
# run executable (name has to match with CMakeLists.txt file)
CMD [ "./app" ]
Docker directory would look like this:
Docker
|__vcpkg
|__ ...
|__project
|__CMakeLists.txt
|__main.cpp
|__build
|__app
|__ ...
CMakeLists.txt
cmake_minimum_required(VERSION 3.8)
project(project)
# full path from root directory
include(/vcpkg/scripts/buildsystems/vcpkg.cmake)
find_package(Crow CONFIG REQUIRED)
add_executable(
app
main.cpp
)
target_link_libraries(app PUBLIC Crow::Crow)
build Docker image in local directory
project
|__Dockerfile
|__CMakeLists.txt
|__main.cpp
Navigate to project folder in shell and run docker build -t image_name:1 . to build the Docker image and run Docker container with docker run -d -it --rm --name container_name -p 443:18080 image_name:1.
Crow Project compiled with g++ command and header only library in Docker container
I created the crow_all.h header only file from Crow Github repository and downloaded the asio package via VCPKG on my PC and copied the header files (C:\vcpkg\packages\asio_x64-windows\include) to my project folder into a subdirectory called asio. Hence, my project directory look like this:
project
|__asio
|__asio.hpp
|__asio
|__ ...
|__crow_all.h
|__Dockerfile
|__main.cpp
I build and run the Docker image/container with the same commands as above.
Dockerfile
(entire content from project directory gets copied into /usr/src/ directory in Docker container)
# get baseimage
FROM gcc:12
# copy files from local folder to destination
COPY . /usr/src
# define working directory in container
WORKDIR /usr/src
# compile main.cpp (-I/usr/src/asio/ link path starting from root)
RUN g++ -I/usr/src/asio/ main.cpp -lpthread -o app
# run executable
CMD [ "./app" ]
To the other questions
I still do not know, whether that is possible.
With such a (still) simple file structure no serious conflicts appeared.