如何使用nix构建docker容器？ [英] How to build a docker container with nix?

问题描述

具体来说，我想使用Nix作为一个更有代表性的替代方案， code> Dockerfile 有更快（非线性）的图像构建。

我已经找到 dockerTools.buildImage 但是我'd喜欢有一个最小的工作示例，我也想知道最终在Docker容器中的结果。

解决方案

p>以下示例程序包（使用 contents = ）将$ code> pkgs.nginx nixpkgs程序包导入Docker容器： p>

  docker load --input $（nix-build -E'with import< nixpkgs> {}; pkgs.dockerTools.buildImage { name =nix-htop; contents = pkgs.htop; config = {Cmd = [/ bin / htop];};}'）
  

然后，您可以使用

$ b运行它
$ b

  docker run -it nix-htop 
  

容器的内容非常小，单个Docker图层：

  docker save nix-htop | tar x --to-stdout --wildcards'* / layer.tar'| tar t --exclude =* / * / * / *
 ./ 
 ./bin/ 
 ./bin/htop 
 ./share/ 
 ./share/applications/ 
 ./share/man/ 
 ./share/pixmaps/ 
 nix / 
 nix / store / 
 nix / store / gi5vvbjawzw1bakiksazbd50bvfmpmmc- ncurses-6.0 / 
 nix / store / pa5nkrpd5hg5qp1dc4gmbd2vdhn1y3x2-htop-2.0.2 / 
 nix / store / vn6fkjnfps37wa82ri4mwszwvnnan6sk-glibc-2.25 / 
  

只有htop及其依赖关系（glibc，ncurses），我的案例为26 MB。

I have a Nix package I'd like to bundle up into a docker container.

Specifically, I want to use Nix as a more expressive alternative to a Dockerfile to have faster (non-linear) image builds.

I've found documentation on dockerTools.buildImage but I'd like to have a minimal working example, and I'd also like to know what ends up being in the docker container.

解决方案

The following example packages (using contents =) the pkgs.nginx nixpkgs package into a docker container:

docker load --input $(nix-build -E 'with import <nixpkgs> {}; pkgs.dockerTools.buildImage { name = "nix-htop"; contents = pkgs.htop; config = { Cmd = [ "/bin/htop" ]; }; }')

You can then run it with

docker run -it nix-htop

The contents of the container are pretty minimal, a single Docker layer:

docker save nix-htop | tar x --to-stdout --wildcards '*/layer.tar' | tar t --exclude="*/*/*/*"
./
./bin/
./bin/htop
./share/
./share/applications/
./share/man/
./share/pixmaps/
nix/
nix/store/
nix/store/gi5vvbjawzw1bakiksazbd50bvfmpmmc-ncurses-6.0/
nix/store/pa5nkrpd5hg5qp1dc4gmbd2vdhn1y3x2-htop-2.0.2/
nix/store/vn6fkjnfps37wa82ri4mwszwvnnan6sk-glibc-2.25/

Only htop and its dependencies (glibc, ncurses), 26 MB on my case.

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