nixpkgs/pkgs/build-support/docker/examples.nix
Antoine Eiche df589a438e dockerTools.buildImageWithNixDb: populate the Nix Db of the image Nix store
Currently, the contents closure is copied to the layer but there is no
nix database initialization. If pkgs.nix is added in the contents,
nix-store doesn't work because there is no nix database.

From the contents of the layer, this commit generates and loads the
database in the nix store of the container. This only works if there
is no parent layer that already have a nix store (to support several
nix layers, we would have to merge nix databases of parent layers).

We also add an example to play with the nix store inside the
container. Note it seems `more` is a missing dependency of the nix
package!
2017-09-20 20:14:24 +02:00

118 lines
2.8 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, pullImage, shadowSetup, buildImageWithNixDb }:
rec {
# 1. basic example
bash = buildImage {
name = "bash";
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 nginx nginx;
daemon off;
error_log /dev/stdout info;
pid /dev/null;
events {}
http {
access_log /dev/stdout;
server {
listen ${nginxPort};
index index.html;
location / {
root ${nginxWebRoot};
}
}
}
'';
nginxWebRoot = pkgs.writeTextDir "index.html" ''
<html><body><h1>Hello from NGINX</h1></body></html>
'';
in
buildImage {
name = "nginx-container";
contents = pkgs.nginx;
runAsRoot = ''
#!${pkgs.stdenv.shell}
${shadowSetup}
groupadd --system nginx
useradd --system --gid nginx nginx
'';
config = {
Cmd = [ "nginx" "-c" nginxConf ];
ExposedPorts = {
"${nginxPort}/tcp" = {};
};
};
};
# 4. example of pulling an image. could be used as a base for other images
nixFromDockerHub = pullImage {
imageName = "nixos/nix";
imageTag = "1.11";
# this hash will need change if the tag is updated at docker hub
sha256 = "18xvcnl0yvj9kfi5bkimrhhjaa8xhm3jhshh2xd7c0sbfrmfqzvi";
};
# 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
];
};
# 5. 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";
contents = [
# nix-store -qR uses the 'more' program which is not included in
# the pkgs.nix dependencies. We then have to manually get it
# from the 'eject' package:/
pkgs.eject
pkgs.nix
];
};
}