2020-04-24 23:36:52 +00:00
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# Examples of using the docker tools to build packages.
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#
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# This file defines several docker images. In order to use an image,
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# build its derivation with `nix-build`, and then load the result with
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# `docker load`. For example:
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#
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# $ nix-build '<nixpkgs>' -A dockerTools.examples.redis
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# $ docker load < result
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2020-12-03 08:41:04 +00:00
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{ pkgs, buildImage, buildLayeredImage, fakeNss, pullImage, shadowSetup, buildImageWithNixDb, pkgsCross }:
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2020-04-24 23:36:52 +00:00
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rec {
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# 1. basic example
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bash = buildImage {
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name = "bash";
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tag = "latest";
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contents = pkgs.bashInteractive;
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};
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# 2. service example, layered on another image
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redis = buildImage {
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name = "redis";
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tag = "latest";
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# for example's sake, we can layer redis on top of bash or debian
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fromImage = bash;
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# fromImage = debian;
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contents = pkgs.redis;
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runAsRoot = ''
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mkdir -p /data
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'';
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config = {
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Cmd = [ "/bin/redis-server" ];
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WorkingDir = "/data";
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Volumes = {
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"/data" = {};
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};
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};
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};
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# 3. another service example
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nginx = let
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nginxPort = "80";
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nginxConf = pkgs.writeText "nginx.conf" ''
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2020-12-03 08:41:04 +00:00
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user nobody nobody;
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2020-04-24 23:36:52 +00:00
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daemon off;
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error_log /dev/stdout info;
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pid /dev/null;
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events {}
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http {
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access_log /dev/stdout;
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server {
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listen ${nginxPort};
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index index.html;
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location / {
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root ${nginxWebRoot};
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}
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}
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}
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'';
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nginxWebRoot = pkgs.writeTextDir "index.html" ''
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<html><body><h1>Hello from NGINX</h1></body></html>
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'';
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in
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2020-12-03 08:41:04 +00:00
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buildLayeredImage {
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2020-04-24 23:36:52 +00:00
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name = "nginx-container";
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tag = "latest";
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2020-12-03 08:41:04 +00:00
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contents = [
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fakeNss
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pkgs.nginx
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];
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2020-04-24 23:36:52 +00:00
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2020-05-15 21:57:56 +00:00
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extraCommands = ''
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# nginx still tries to read this directory even if error_log
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# directive is specifying another file :/
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mkdir -p var/log/nginx
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mkdir -p var/cache/nginx
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'';
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2020-04-24 23:36:52 +00:00
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config = {
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Cmd = [ "nginx" "-c" nginxConf ];
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ExposedPorts = {
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"${nginxPort}/tcp" = {};
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};
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};
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};
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# 4. example of pulling an image. could be used as a base for other images
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nixFromDockerHub = pullImage {
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imageName = "nixos/nix";
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imageDigest = "sha256:85299d86263a3059cf19f419f9d286cc9f06d3c13146a8ebbb21b3437f598357";
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sha256 = "07q9y9r7fsd18sy95ybrvclpkhlal12d30ybnf089hq7v1hgxbi7";
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finalImageTag = "2.2.1";
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finalImageName = "nix";
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};
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# 5. example of multiple contents, emacs and vi happily coexisting
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editors = buildImage {
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name = "editors";
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contents = [
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pkgs.coreutils
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pkgs.bash
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pkgs.emacs
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pkgs.vim
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pkgs.nano
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];
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};
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# 6. nix example to play with the container nix store
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# docker run -it --rm nix nix-store -qR $(nix-build '<nixpkgs>' -A nix)
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nix = buildImageWithNixDb {
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name = "nix";
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tag = "latest";
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contents = [
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# nix-store uses cat program to display results as specified by
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# the image env variable NIX_PAGER.
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pkgs.coreutils
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pkgs.nix
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2020-06-15 15:56:04 +00:00
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pkgs.bash
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2020-04-24 23:36:52 +00:00
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];
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config = {
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Env = [
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"NIX_PAGER=cat"
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# A user is required by nix
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# https://github.com/NixOS/nix/blob/9348f9291e5d9e4ba3c4347ea1b235640f54fd79/src/libutil/util.cc#L478
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"USER=nobody"
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];
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};
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};
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# 7. example of adding something on top of an image pull by our
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# dockerTools chain.
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onTopOfPulledImage = buildImage {
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name = "onTopOfPulledImage";
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tag = "latest";
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fromImage = nixFromDockerHub;
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contents = [ pkgs.hello ];
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};
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# 8. regression test for erroneous use of eval and string expansion.
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# See issue #34779 and PR #40947 for details.
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runAsRootExtraCommands = pkgs.dockerTools.buildImage {
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name = "runAsRootExtraCommands";
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tag = "latest";
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contents = [ pkgs.coreutils ];
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# The parens here are to create problematic bash to embed and eval. In case
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# this is *embedded* into the script (with nix expansion) the initial quotes
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# will close the string and the following parens are unexpected
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runAsRoot = ''echo "(runAsRoot)" > runAsRoot'';
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extraCommands = ''echo "(extraCommand)" > extraCommands'';
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};
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# 9. Ensure that setting created to now results in a date which
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# isn't the epoch + 1
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unstableDate = pkgs.dockerTools.buildImage {
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name = "unstable-date";
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tag = "latest";
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contents = [ pkgs.coreutils ];
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created = "now";
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};
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# 10. Create a layered image
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layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "layered-image";
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tag = "latest";
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extraCommands = ''echo "(extraCommand)" > extraCommands'';
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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contents = [ pkgs.hello pkgs.bash pkgs.coreutils ];
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};
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# 11. Create an image on top of a layered image
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layered-on-top = pkgs.dockerTools.buildImage {
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name = "layered-on-top";
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tag = "latest";
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fromImage = layered-image;
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extraCommands = ''
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mkdir ./example-output
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chmod 777 ./example-output
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'';
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config = {
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Env = [ "PATH=${pkgs.coreutils}/bin/" ];
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WorkingDir = "/example-output";
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Cmd = [
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"${pkgs.bash}/bin/bash" "-c" "echo hello > foo; cat foo"
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];
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};
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};
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# 12. example of running something as root on top of a parent image
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# Regression test related to PR #52109
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runAsRootParentImage = buildImage {
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name = "runAsRootParentImage";
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tag = "latest";
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runAsRoot = "touch /example-file";
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fromImage = bash;
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};
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# 13. example of 3 layers images This image is used to verify the
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# order of layers is correct.
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# It allows to validate
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# - the layer of parent are below
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# - the order of parent layer is preserved at image build time
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# (this is why there are 3 images)
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layersOrder = let
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l1 = pkgs.dockerTools.buildImage {
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name = "l1";
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tag = "latest";
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extraCommands = ''
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mkdir -p tmp
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echo layer1 > tmp/layer1
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echo layer1 > tmp/layer2
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echo layer1 > tmp/layer3
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'';
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};
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l2 = pkgs.dockerTools.buildImage {
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name = "l2";
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fromImage = l1;
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tag = "latest";
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extraCommands = ''
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mkdir -p tmp
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echo layer2 > tmp/layer2
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echo layer2 > tmp/layer3
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'';
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};
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in pkgs.dockerTools.buildImage {
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name = "l3";
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fromImage = l2;
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tag = "latest";
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contents = [ pkgs.coreutils ];
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extraCommands = ''
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mkdir -p tmp
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echo layer3 > tmp/layer3
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'';
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};
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2020-05-15 21:57:56 +00:00
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# 14. Environment variable inheritance.
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# Child image should inherit parents environment variables,
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# optionally overriding them.
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environmentVariables = let
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parent = pkgs.dockerTools.buildImage {
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name = "parent";
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tag = "latest";
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config = {
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Env = [
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"FROM_PARENT=true"
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"LAST_LAYER=parent"
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];
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};
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};
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in pkgs.dockerTools.buildImage {
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name = "child";
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fromImage = parent;
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tag = "latest";
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contents = [ pkgs.coreutils ];
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config = {
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Env = [
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"FROM_CHILD=true"
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"LAST_LAYER=child"
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];
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};
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};
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# 15. Create another layered image, for comparing layers with image 10.
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2020-04-24 23:36:52 +00:00
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another-layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "another-layered-image";
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tag = "latest";
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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};
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2020-05-15 21:57:56 +00:00
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# 16. Create a layered image with only 2 layers
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2020-04-24 23:36:52 +00:00
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two-layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "two-layered-image";
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tag = "latest";
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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contents = [ pkgs.bash pkgs.hello ];
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maxLayers = 2;
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};
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2020-05-15 21:57:56 +00:00
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# 17. Create a layered image with more packages than max layers.
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2020-04-24 23:36:52 +00:00
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# coreutils and hello are part of the same layer
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bulk-layer = pkgs.dockerTools.buildLayeredImage {
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name = "bulk-layer";
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tag = "latest";
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contents = with pkgs; [
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coreutils hello
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];
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maxLayers = 2;
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};
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2020-05-15 21:57:56 +00:00
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# 18. Create a "layered" image without nix store layers. This is not
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2020-04-24 23:36:52 +00:00
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# recommended, but can be useful for base images in rare cases.
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no-store-paths = pkgs.dockerTools.buildLayeredImage {
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name = "no-store-paths";
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tag = "latest";
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extraCommands = ''
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# This removes sharing of busybox and is not recommended. We do this
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# to make the example suitable as a test case with working binaries.
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cp -r ${pkgs.pkgsStatic.busybox}/* .
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'';
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};
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2020-06-15 15:56:04 +00:00
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nixLayered = pkgs.dockerTools.buildLayeredImageWithNixDb {
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name = "nix-layered";
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tag = "latest";
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contents = [
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# nix-store uses cat program to display results as specified by
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# the image env variable NIX_PAGER.
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pkgs.coreutils
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pkgs.nix
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pkgs.bash
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];
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config = {
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Env = [
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"NIX_PAGER=cat"
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# A user is required by nix
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# https://github.com/NixOS/nix/blob/9348f9291e5d9e4ba3c4347ea1b235640f54fd79/src/libutil/util.cc#L478
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"USER=nobody"
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];
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};
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};
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2020-07-18 16:06:22 +00:00
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# 19. Support files in the store on buildLayeredImage
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# See: https://github.com/NixOS/nixpkgs/pull/91084#issuecomment-653496223
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filesInStore = pkgs.dockerTools.buildLayeredImageWithNixDb {
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name = "file-in-store";
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|
|
tag = "latest";
|
|
|
|
|
contents = [
|
|
|
|
|
pkgs.coreutils
|
|
|
|
|
pkgs.nix
|
|
|
|
|
(pkgs.writeScriptBin "myscript" ''
|
|
|
|
|
#!${pkgs.runtimeShell}
|
|
|
|
|
cat ${pkgs.writeText "somefile" "some data"}
|
|
|
|
|
'')
|
|
|
|
|
];
|
|
|
|
|
config = {
|
|
|
|
|
Cmd = [ "myscript" ];
|
|
|
|
|
# For some reason 'nix-store --verify' requires this environment variable
|
|
|
|
|
Env = [ "USER=root" ];
|
|
|
|
|
};
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
# 20. Ensure that setting created to now results in a date which
|
|
|
|
|
# isn't the epoch + 1 for layered images.
|
|
|
|
|
unstableDateLayered = pkgs.dockerTools.buildLayeredImage {
|
|
|
|
|
name = "unstable-date-layered";
|
|
|
|
|
tag = "latest";
|
|
|
|
|
contents = [ pkgs.coreutils ];
|
|
|
|
|
created = "now";
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
# buildImage without explicit tag
|
|
|
|
|
bashNoTag = pkgs.dockerTools.buildImage {
|
|
|
|
|
name = "bash-no-tag";
|
|
|
|
|
contents = pkgs.bashInteractive;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
# buildLayeredImage without explicit tag
|
|
|
|
|
bashNoTagLayered = pkgs.dockerTools.buildLayeredImage {
|
|
|
|
|
name = "bash-no-tag-layered";
|
|
|
|
|
contents = pkgs.bashInteractive;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
# buildImage without explicit tag
|
|
|
|
|
bashNoTagStreamLayered = pkgs.dockerTools.streamLayeredImage {
|
|
|
|
|
name = "bash-no-tag-stream-layered";
|
|
|
|
|
contents = pkgs.bashInteractive;
|
|
|
|
|
};
|
|
|
|
|
|
2020-08-20 17:08:02 +00:00
|
|
|
# buildLayeredImage with non-root user
|
|
|
|
|
bashLayeredWithUser =
|
|
|
|
|
let
|
|
|
|
|
nonRootShadowSetup = { user, uid, gid ? uid }: with pkgs; [
|
|
|
|
|
(
|
|
|
|
|
writeTextDir "etc/shadow" ''
|
|
|
|
|
root:!x:::::::
|
|
|
|
|
${user}:!:::::::
|
|
|
|
|
''
|
|
|
|
|
)
|
|
|
|
|
(
|
|
|
|
|
writeTextDir "etc/passwd" ''
|
|
|
|
|
root:x:0:0::/root:${runtimeShell}
|
|
|
|
|
${user}:x:${toString uid}:${toString gid}::/home/${user}:
|
|
|
|
|
''
|
|
|
|
|
)
|
|
|
|
|
(
|
|
|
|
|
writeTextDir "etc/group" ''
|
|
|
|
|
root:x:0:
|
|
|
|
|
${user}:x:${toString gid}:
|
|
|
|
|
''
|
|
|
|
|
)
|
|
|
|
|
(
|
|
|
|
|
writeTextDir "etc/gshadow" ''
|
|
|
|
|
root:x::
|
|
|
|
|
${user}:x::
|
|
|
|
|
''
|
|
|
|
|
)
|
|
|
|
|
];
|
|
|
|
|
in
|
|
|
|
|
pkgs.dockerTools.buildLayeredImage {
|
|
|
|
|
name = "bash-layered-with-user";
|
|
|
|
|
tag = "latest";
|
2020-09-25 04:45:31 +00:00
|
|
|
contents = [ pkgs.bash pkgs.coreutils ] ++ nonRootShadowSetup { uid = 999; user = "somebody"; };
|
2020-08-20 17:08:02 +00:00
|
|
|
};
|
|
|
|
|
|
2020-11-21 19:51:51 +00:00
|
|
|
# basic example, with cross compilation
|
|
|
|
|
cross = let
|
|
|
|
|
# Cross compile for x86_64 if on aarch64
|
|
|
|
|
crossPkgs =
|
|
|
|
|
if pkgs.system == "aarch64-linux" then pkgsCross.gnu64
|
|
|
|
|
else pkgsCross.aarch64-multiplatform;
|
|
|
|
|
in crossPkgs.dockerTools.buildImage {
|
|
|
|
|
name = "hello-cross";
|
|
|
|
|
tag = "latest";
|
|
|
|
|
contents = crossPkgs.hello;
|
|
|
|
|
};
|
|
|
|
|
|
2021-01-05 17:05:55 +00:00
|
|
|
# layered image where a store path is itself a symlink
|
|
|
|
|
layeredStoreSymlink =
|
|
|
|
|
let
|
|
|
|
|
target = pkgs.writeTextDir "dir/target" "Content doesn't matter.";
|
|
|
|
|
symlink = pkgs.runCommandNoCC "symlink" {} "ln -s ${target} $out";
|
|
|
|
|
in
|
|
|
|
|
pkgs.dockerTools.buildLayeredImage {
|
|
|
|
|
name = "layeredstoresymlink";
|
|
|
|
|
tag = "latest";
|
|
|
|
|
contents = [ pkgs.bash symlink ];
|
|
|
|
|
} // { passthru = { inherit symlink; }; };
|
2021-03-12 07:09:13 +00:00
|
|
|
|
|
|
|
|
# image with registry/ prefix
|
|
|
|
|
prefixedImage = pkgs.dockerTools.buildImage {
|
|
|
|
|
name = "registry-1.docker.io/image";
|
|
|
|
|
tag = "latest";
|
|
|
|
|
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
# layered image with registry/ prefix
|
|
|
|
|
prefixedLayeredImage = pkgs.dockerTools.buildLayeredImage {
|
|
|
|
|
name = "registry-1.docker.io/layered-image";
|
|
|
|
|
tag = "latest";
|
|
|
|
|
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
|
|
|
|
|
};
|
2020-04-24 23:36:52 +00:00
|
|
|
}
|
