![]() Still, the amount of stuff that comes with the C++ compilers and development libraries is astounding. Understandably having the build-time environment in the image will bring its size up. Let’s see what happens when it’s compiled: $ docker build -q -f Dockerfile-v1 -t example. What’s left is compiling and installing the application, and defining the default entry point to the container. #BUILD CMAKE LINUX CODE#The COPY instruction will copy the CMakeLists.txt and the source code of the application from the build context. But if I was to undergo that kind of scrutiny, I might as well package cppzmq and serve it (with signatures) from a private apt repository. #BUILD CMAKE LINUX ARCHIVE#But luckily cppzmq also provides an upstream CMake config file that is installed alongside the headers when doing a full installation.Ī very careful approach to installing cppzmq would also include verifying the checksum of the archive in case Github or the certificate trust chain was compromised. ![]() cppzmq itself is a header-only library, so just dropping the header file to the include path would suffice if I would author find module for cppzmq myself. The gcc:9 image is based on Debian, and since cppzmq isn’t included in the Debian package repository, it’s downloaded and installed directly from Github. Here’s the example Dockerfile: FROM gcc:9Ĭmake -D CPPZMQ_BUILD_TESTS:BOOL=OFF. The simplest idea is just basing an image on a “batteries included” base image containing the compiler, installing the extra libraries, and finally building the example application. First version: One big image containing the build and runtime environments The CMakeLists.txt doesn’t need to specify that kind of transitive dependencies explicitly. Note that “linking” a target in the CMake parlance means both that the compiler is pointed to the necessary headers, and that the linker is pointed to the necessary shared libraries.Īlso note that although cppzmq is just a header-only wrapper on top of the ZeroMQ kernel, the cppzmq target carries a dependency to the ZeroMQ kernel. The loop defines two targets ( client and server), along with their dependencies. The first two lines declare the required CMake version and the project name. Install(TARGETS server client RUNTIME DESTINATION bin) Set_property(TARGET $ PROPERTY CXX_STANDARD 17) In this very simple case the CMakeLists.txt file consumed by CMake is very simple: cmake_minimum_required(VERSION 3.13) ![]() The high level description can then be compiled to the actual Makefiles, IDE projects etc. Following the example of the official MySQL image, both the server and the client are packaged inside the same image.ĬMake is a meta build system that uses a high level-language to describe the build configuration. The source code for the server and the client are available in GitHub. #BUILD CMAKE LINUX INSTALL#And while the ZeroMQ kernel is widely available to install via the package manager, cppzmq isn’t, so it will be built and installed from sources. To make things a bit more interesting, I’ll use the cppzmq library that provides the basic C++ bindings on top of ZeroMQ. The program I’ll use as an example in this post is a simple echo server using ZeroMQ as the transport library. To save you from the details I’ll use an example program, but the strategies presented across the versions are what I did and learned. While containerizing a C++ application isn’t hard, I ended up learning a few things. Much of the Docker documentation and examples across the web are concentrating on creating images for interpreted languages. I’m relatively new to Docker and started searching online for recipes for such cases. Some of the libraries were readily available via package repositories and others that needed to be built from sources. ![]() I wanted to containerize a C++ application depending on some external libraries. ![]()
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