545 lines
14 KiB
Nix
545 lines
14 KiB
Nix
# Examples of using the docker tools to build packages.
|
|
#
|
|
# This file defines several docker images. In order to use an image,
|
|
# build its derivation with `nix-build`, and then load the result with
|
|
# `docker load`. For example:
|
|
#
|
|
# $ nix-build '<nixpkgs>' -A dockerTools.examples.redis
|
|
# $ docker load < result
|
|
|
|
{ pkgs, buildImage, buildLayeredImage, fakeNss, pullImage, shadowSetup, buildImageWithNixDb, pkgsCross }:
|
|
|
|
rec {
|
|
# 1. basic example
|
|
bash = buildImage {
|
|
name = "bash";
|
|
tag = "latest";
|
|
contents = pkgs.bashInteractive;
|
|
};
|
|
|
|
# 2. service example, layered on another image
|
|
redis = buildImage {
|
|
name = "redis";
|
|
tag = "latest";
|
|
|
|
# for example's sake, we can layer redis on top of bash or debian
|
|
fromImage = bash;
|
|
# fromImage = debian;
|
|
|
|
contents = pkgs.redis;
|
|
runAsRoot = ''
|
|
mkdir -p /data
|
|
'';
|
|
|
|
config = {
|
|
Cmd = [ "/bin/redis-server" ];
|
|
WorkingDir = "/data";
|
|
Volumes = {
|
|
"/data" = {};
|
|
};
|
|
};
|
|
};
|
|
|
|
# 3. another service example
|
|
nginx = let
|
|
nginxPort = "80";
|
|
nginxConf = pkgs.writeText "nginx.conf" ''
|
|
user nobody nobody;
|
|
daemon off;
|
|
error_log /dev/stdout info;
|
|
pid /dev/null;
|
|
events {}
|
|
http {
|
|
access_log /dev/stdout;
|
|
server {
|
|
listen ${nginxPort};
|
|
index index.html;
|
|
location / {
|
|
root ${nginxWebRoot};
|
|
}
|
|
}
|
|
}
|
|
'';
|
|
nginxWebRoot = pkgs.writeTextDir "index.html" ''
|
|
<html><body><h1>Hello from NGINX</h1></body></html>
|
|
'';
|
|
in
|
|
buildLayeredImage {
|
|
name = "nginx-container";
|
|
tag = "latest";
|
|
contents = [
|
|
fakeNss
|
|
pkgs.nginx
|
|
];
|
|
|
|
extraCommands = ''
|
|
# nginx still tries to read this directory even if error_log
|
|
# directive is specifying another file :/
|
|
mkdir -p var/log/nginx
|
|
mkdir -p var/cache/nginx
|
|
'';
|
|
|
|
config = {
|
|
Cmd = [ "nginx" "-c" nginxConf ];
|
|
ExposedPorts = {
|
|
"${nginxPort}/tcp" = {};
|
|
};
|
|
};
|
|
};
|
|
|
|
# 4. example of pulling an image. could be used as a base for other images
|
|
nixFromDockerHub = pullImage {
|
|
imageName = "nixos/nix";
|
|
imageDigest = "sha256:85299d86263a3059cf19f419f9d286cc9f06d3c13146a8ebbb21b3437f598357";
|
|
sha256 = "19fw0n3wmddahzr20mhdqv6jkjn1kanh6n2mrr08ai53dr8ph5n7";
|
|
finalImageTag = "2.2.1";
|
|
finalImageName = "nix";
|
|
};
|
|
|
|
# 5. example of multiple contents, emacs and vi happily coexisting
|
|
editors = buildImage {
|
|
name = "editors";
|
|
contents = [
|
|
pkgs.coreutils
|
|
pkgs.bash
|
|
pkgs.emacs
|
|
pkgs.vim
|
|
pkgs.nano
|
|
];
|
|
};
|
|
|
|
# 6. nix example to play with the container nix store
|
|
# docker run -it --rm nix nix-store -qR $(nix-build '<nixpkgs>' -A nix)
|
|
nix = buildImageWithNixDb {
|
|
name = "nix";
|
|
tag = "latest";
|
|
contents = [
|
|
# nix-store uses cat program to display results as specified by
|
|
# the image env variable NIX_PAGER.
|
|
pkgs.coreutils
|
|
pkgs.nix
|
|
pkgs.bash
|
|
];
|
|
config = {
|
|
Env = [
|
|
"NIX_PAGER=cat"
|
|
# A user is required by nix
|
|
# https://github.com/NixOS/nix/blob/9348f9291e5d9e4ba3c4347ea1b235640f54fd79/src/libutil/util.cc#L478
|
|
"USER=nobody"
|
|
];
|
|
};
|
|
};
|
|
|
|
# 7. example of adding something on top of an image pull by our
|
|
# dockerTools chain.
|
|
onTopOfPulledImage = buildImage {
|
|
name = "onTopOfPulledImage";
|
|
tag = "latest";
|
|
fromImage = nixFromDockerHub;
|
|
contents = [ pkgs.hello ];
|
|
};
|
|
|
|
# 8. regression test for erroneous use of eval and string expansion.
|
|
# See issue #34779 and PR #40947 for details.
|
|
runAsRootExtraCommands = pkgs.dockerTools.buildImage {
|
|
name = "runAsRootExtraCommands";
|
|
tag = "latest";
|
|
contents = [ pkgs.coreutils ];
|
|
# The parens here are to create problematic bash to embed and eval. In case
|
|
# this is *embedded* into the script (with nix expansion) the initial quotes
|
|
# will close the string and the following parens are unexpected
|
|
runAsRoot = ''echo "(runAsRoot)" > runAsRoot'';
|
|
extraCommands = ''echo "(extraCommand)" > extraCommands'';
|
|
};
|
|
|
|
# 9. Ensure that setting created to now results in a date which
|
|
# isn't the epoch + 1
|
|
unstableDate = pkgs.dockerTools.buildImage {
|
|
name = "unstable-date";
|
|
tag = "latest";
|
|
contents = [ pkgs.coreutils ];
|
|
created = "now";
|
|
};
|
|
|
|
# 10. Create a layered image
|
|
layered-image = pkgs.dockerTools.buildLayeredImage {
|
|
name = "layered-image";
|
|
tag = "latest";
|
|
extraCommands = ''echo "(extraCommand)" > extraCommands'';
|
|
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
|
|
contents = [ pkgs.hello pkgs.bash pkgs.coreutils ];
|
|
};
|
|
|
|
# 11. Create an image on top of a layered image
|
|
layered-on-top = pkgs.dockerTools.buildImage {
|
|
name = "layered-on-top";
|
|
tag = "latest";
|
|
fromImage = layered-image;
|
|
extraCommands = ''
|
|
mkdir ./example-output
|
|
chmod 777 ./example-output
|
|
'';
|
|
config = {
|
|
Env = [ "PATH=${pkgs.coreutils}/bin/" ];
|
|
WorkingDir = "/example-output";
|
|
Cmd = [
|
|
"${pkgs.bash}/bin/bash" "-c" "echo hello > foo; cat foo"
|
|
];
|
|
};
|
|
};
|
|
|
|
# 12 Create a layered image on top of a layered image
|
|
layered-on-top-layered = pkgs.dockerTools.buildLayeredImage {
|
|
name = "layered-on-top-layered";
|
|
tag = "latest";
|
|
fromImage = layered-image;
|
|
extraCommands = ''
|
|
mkdir ./example-output
|
|
chmod 777 ./example-output
|
|
'';
|
|
config = {
|
|
Env = [ "PATH=${pkgs.coreutils}/bin/" ];
|
|
WorkingDir = "/example-output";
|
|
Cmd = [
|
|
"${pkgs.bash}/bin/bash" "-c" "echo hello > foo; cat foo"
|
|
];
|
|
};
|
|
};
|
|
|
|
# 13. example of running something as root on top of a parent image
|
|
# Regression test related to PR #52109
|
|
runAsRootParentImage = buildImage {
|
|
name = "runAsRootParentImage";
|
|
tag = "latest";
|
|
runAsRoot = "touch /example-file";
|
|
fromImage = bash;
|
|
};
|
|
|
|
# 14. example of 3 layers images This image is used to verify the
|
|
# order of layers is correct.
|
|
# It allows to validate
|
|
# - the layer of parent are below
|
|
# - the order of parent layer is preserved at image build time
|
|
# (this is why there are 3 images)
|
|
layersOrder = let
|
|
l1 = pkgs.dockerTools.buildImage {
|
|
name = "l1";
|
|
tag = "latest";
|
|
extraCommands = ''
|
|
mkdir -p tmp
|
|
echo layer1 > tmp/layer1
|
|
echo layer1 > tmp/layer2
|
|
echo layer1 > tmp/layer3
|
|
'';
|
|
};
|
|
l2 = pkgs.dockerTools.buildImage {
|
|
name = "l2";
|
|
fromImage = l1;
|
|
tag = "latest";
|
|
extraCommands = ''
|
|
mkdir -p tmp
|
|
echo layer2 > tmp/layer2
|
|
echo layer2 > tmp/layer3
|
|
'';
|
|
};
|
|
in pkgs.dockerTools.buildImage {
|
|
name = "l3";
|
|
fromImage = l2;
|
|
tag = "latest";
|
|
contents = [ pkgs.coreutils ];
|
|
extraCommands = ''
|
|
mkdir -p tmp
|
|
echo layer3 > tmp/layer3
|
|
'';
|
|
};
|
|
|
|
# 15. Environment variable inheritance.
|
|
# Child image should inherit parents environment variables,
|
|
# optionally overriding them.
|
|
environmentVariablesParent = pkgs.dockerTools.buildImage {
|
|
name = "parent";
|
|
tag = "latest";
|
|
config = {
|
|
Env = [
|
|
"FROM_PARENT=true"
|
|
"LAST_LAYER=parent"
|
|
];
|
|
};
|
|
};
|
|
|
|
environmentVariables = pkgs.dockerTools.buildImage {
|
|
name = "child";
|
|
fromImage = environmentVariablesParent;
|
|
tag = "latest";
|
|
contents = [ pkgs.coreutils ];
|
|
config = {
|
|
Env = [
|
|
"FROM_CHILD=true"
|
|
"LAST_LAYER=child"
|
|
];
|
|
};
|
|
};
|
|
|
|
environmentVariablesLayered = pkgs.dockerTools.buildLayeredImage {
|
|
name = "child";
|
|
fromImage = environmentVariablesParent;
|
|
tag = "latest";
|
|
contents = [ pkgs.coreutils ];
|
|
config = {
|
|
Env = [
|
|
"FROM_CHILD=true"
|
|
"LAST_LAYER=child"
|
|
];
|
|
};
|
|
};
|
|
|
|
# 16. Create another layered image, for comparing layers with image 10.
|
|
another-layered-image = pkgs.dockerTools.buildLayeredImage {
|
|
name = "another-layered-image";
|
|
tag = "latest";
|
|
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
|
|
};
|
|
|
|
# 17. Create a layered image with only 2 layers
|
|
two-layered-image = pkgs.dockerTools.buildLayeredImage {
|
|
name = "two-layered-image";
|
|
tag = "latest";
|
|
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
|
|
contents = [ pkgs.bash pkgs.hello ];
|
|
maxLayers = 2;
|
|
};
|
|
|
|
# 18. Create a layered image with more packages than max layers.
|
|
# coreutils and hello are part of the same layer
|
|
bulk-layer = pkgs.dockerTools.buildLayeredImage {
|
|
name = "bulk-layer";
|
|
tag = "latest";
|
|
contents = with pkgs; [
|
|
coreutils hello
|
|
];
|
|
maxLayers = 2;
|
|
};
|
|
|
|
# 19. Create a layered image with a base image and more packages than max
|
|
# layers. coreutils and hello are part of the same layer
|
|
layered-bulk-layer = pkgs.dockerTools.buildLayeredImage {
|
|
name = "layered-bulk-layer";
|
|
tag = "latest";
|
|
fromImage = two-layered-image;
|
|
contents = with pkgs; [
|
|
coreutils hello
|
|
];
|
|
maxLayers = 4;
|
|
};
|
|
|
|
# 20. Create a "layered" image without nix store layers. This is not
|
|
# recommended, but can be useful for base images in rare cases.
|
|
no-store-paths = pkgs.dockerTools.buildLayeredImage {
|
|
name = "no-store-paths";
|
|
tag = "latest";
|
|
extraCommands = ''
|
|
# This removes sharing of busybox and is not recommended. We do this
|
|
# to make the example suitable as a test case with working binaries.
|
|
cp -r ${pkgs.pkgsStatic.busybox}/* .
|
|
'';
|
|
};
|
|
|
|
nixLayered = pkgs.dockerTools.buildLayeredImageWithNixDb {
|
|
name = "nix-layered";
|
|
tag = "latest";
|
|
contents = [
|
|
# nix-store uses cat program to display results as specified by
|
|
# the image env variable NIX_PAGER.
|
|
pkgs.coreutils
|
|
pkgs.nix
|
|
pkgs.bash
|
|
];
|
|
config = {
|
|
Env = [
|
|
"NIX_PAGER=cat"
|
|
# A user is required by nix
|
|
# https://github.com/NixOS/nix/blob/9348f9291e5d9e4ba3c4347ea1b235640f54fd79/src/libutil/util.cc#L478
|
|
"USER=nobody"
|
|
];
|
|
};
|
|
};
|
|
|
|
# 21. Support files in the store on buildLayeredImage
|
|
# See: https://github.com/NixOS/nixpkgs/pull/91084#issuecomment-653496223
|
|
filesInStore = pkgs.dockerTools.buildLayeredImageWithNixDb {
|
|
name = "file-in-store";
|
|
tag = "latest";
|
|
contents = [
|
|
pkgs.coreutils
|
|
pkgs.nix
|
|
(pkgs.writeScriptBin "myscript" ''
|
|
#!${pkgs.runtimeShell}
|
|
cat ${pkgs.writeText "somefile" "some data"}
|
|
'')
|
|
];
|
|
config = {
|
|
Cmd = [ "myscript" ];
|
|
# For some reason 'nix-store --verify' requires this environment variable
|
|
Env = [ "USER=root" ];
|
|
};
|
|
};
|
|
|
|
# 22. 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;
|
|
};
|
|
|
|
# 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";
|
|
contents = [ pkgs.bash pkgs.coreutils ] ++ nonRootShadowSetup { uid = 999; user = "somebody"; };
|
|
};
|
|
|
|
# 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;
|
|
};
|
|
|
|
# layered image where a store path is itself a symlink
|
|
layeredStoreSymlink =
|
|
let
|
|
target = pkgs.writeTextDir "dir/target" "Content doesn't matter.";
|
|
symlink = pkgs.runCommand "symlink" {} "ln -s ${target} $out";
|
|
in
|
|
pkgs.dockerTools.buildLayeredImage {
|
|
name = "layeredstoresymlink";
|
|
tag = "latest";
|
|
contents = [ pkgs.bash symlink ];
|
|
} // { passthru = { inherit symlink; }; };
|
|
|
|
# image with registry/ prefix
|
|
prefixedImage = pkgs.dockerTools.buildImage {
|
|
name = "registry-1.docker.io/image";
|
|
tag = "latest";
|
|
config.Cmd = [ "${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" ];
|
|
};
|
|
|
|
# layered image with files owned by a user other than root
|
|
layeredImageWithFakeRootCommands = pkgs.dockerTools.buildLayeredImage {
|
|
name = "layered-image-with-fake-root-commands";
|
|
tag = "latest";
|
|
contents = [
|
|
pkgs.pkgsStatic.busybox
|
|
];
|
|
fakeRootCommands = ''
|
|
mkdir -p ./home/jane
|
|
chown 1000 ./home/jane
|
|
'';
|
|
};
|
|
|
|
# tarball consisting of both bash and redis images
|
|
mergedBashAndRedis = pkgs.dockerTools.mergeImages [
|
|
bash
|
|
redis
|
|
];
|
|
|
|
# tarball consisting of bash (without tag) and redis images
|
|
mergedBashNoTagAndRedis = pkgs.dockerTools.mergeImages [
|
|
bashNoTag
|
|
redis
|
|
];
|
|
|
|
# tarball consisting of bash and layered image with different owner of the
|
|
# /home/jane directory
|
|
mergedBashFakeRoot = pkgs.dockerTools.mergeImages [
|
|
bash
|
|
layeredImageWithFakeRootCommands
|
|
];
|
|
|
|
helloOnRoot = pkgs.dockerTools.streamLayeredImage {
|
|
name = "hello";
|
|
tag = "latest";
|
|
contents = [
|
|
(pkgs.buildEnv {
|
|
name = "hello-root";
|
|
paths = [ pkgs.hello ];
|
|
})
|
|
];
|
|
config.Cmd = [ "hello" ];
|
|
};
|
|
|
|
helloOnRootNoStore = pkgs.dockerTools.streamLayeredImage {
|
|
name = "hello";
|
|
tag = "latest";
|
|
contents = [
|
|
(pkgs.buildEnv {
|
|
name = "hello-root";
|
|
paths = [ pkgs.hello ];
|
|
})
|
|
];
|
|
config.Cmd = [ "hello" ];
|
|
includeStorePaths = false;
|
|
};
|
|
}
|