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Documentation for dotnet distroless build

Image Contents

This image definition contains a minimal Linux, dotnet-based coreCLR runtime.

Specifically, the image contains everything in the /cc image, plus:

    base = "//cc:cc",
    debs = [
        packages["libcurl3"],
        packages["libgssapi-krb5-2"],
        packages["libicu57"],
        packages["liblttng-ust0"],
        packages["libssl1.0.2"],
        packages["libunwind8"],
        packages["libuuid1"],
        packages["zlib1g"],
        packages["curl"],
        packages["libcomerr2"],
        packages["libidn2-0"],
        packages["libk5crypto3"],
        packages["libkrb5-3"],
        packages["libldap-2.4-2"],
        packages["libldap-common"],
        packages["libsasl2-2"],
        packages["libnghttp2-14"],
        packages["libpsl5"],
        packages["librtmp1"],
        packages["libssh2-1"],
        packages["libkeyutils1"],
        packages["libkrb5support0"],
        packages["libunistring0"],
        packages["libgnutls30"],
        packages["libgmp10"],
        packages["libhogweed4"],
        packages["libidn11"],
        packages["libnettle6"],
        packages["libp11-kit0"],
        packages["libffi6"],
        packages["libtasn1-6"],
        packages["libsasl2-modules-db"],
        packages["libdb5.3"],
        packages["libgcrypt20"],
        packages["libgpg-error0"],
        packages["libacl1"],
        packages["libattr1"],
        packages["libselinux1"],
        packages["libpcre3"],
        packages["libbz2-1.0"],
        packages["liblzma5"],
    ],

Note, these dependencies are from the coreclr runtime and runtime-deps that also install curl

# apt-get install apt-rdepends
# apt-rdepends curl

NOTE bazel does not support dotnet build rules yet (see issue #39) so unlike other distroless rules in this repo, users will need to compile and generate your dotnet binary outside of bazel manually. Instructions to generate the default binary files is described below.

Usage

The entrypoint of this image is left unset so this image expects users to supply a the full 'dotnet' and path to the generated .dll file in the CMD.

Example Hello World

To build directly:

$ dotnet --version
2.0.0

$ docker --version
Docker version 17.05.0-ce, build 89658be

then

$ mkdir console && cd console
$ dotnet new console

create a Dockerfile

FROM microsoft/dotnet:2.0.0-sdk AS build-env
ADD . /app
WORKDIR /app
RUN dotnet restore
RUN dotnet publish  -c Release

FROM gcr.io/distroless/dotnet
WORKDIR /app
COPY --from=build-env /app /app/
ENTRYPOINT ["dotnet", "bin/Release/netcoreapp2.0/console.dll"]

then

$ docker build -t myapp .

$ docker run -t myapp
Hello World!

Example Hello World with bazel

See the dotnet Hello World directory for an example and examples/dotnet/BUILD using bazel:

docker_build(
    name = "hello",
    base = "//dotnet:dotnet",
    cmd = [
        "dotnet",
        "/bin/Release/netcoreapp2.0/hello.dll",
    ],
    files = [":bin"],
)

Prerequsite

Since the binary build happens outside of bazel, we need to build a binary out-of-band.

Requires a local installation of dotnet 2.0.0:

dotnet --version
2.0.0

Build and test dotnet locally

cd examples/dotnet

dotnet restore
dotnet publish -c Release

dotnet bin/Release/netcoreapp2.0/publish/hello.dll
Hello World

Build distroless image

bazel build examples/dotnet:hello
bazel run examples/dotnet:hello

Test distroless image

docker run -t bazel/examples/dotnet:hello

Optionally generate platform-target binary

The entrypoint is left unset because users can generate a platform-specific binary to execute directly:

eg. if built on a linux workstation, edit:

examples/dotnet/hello.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
    <RuntimeIdentifiers>ubuntu.14.04-x64;</RuntimeIdentifiers>    
  </PropertyGroup>
</Project>

then

cd examples/dotnet

dotnet restore -r ubuntu.14.04-x64
dotnet publish -c Release -r ubuntu.14.04-x64

which will generate a contained binary:

$ bin/Release/netcoreapp2.0/ubuntu.14.04-x64/publish/hello 
Hello World

which in turn makes the build rule just

docker_build(
    name = "hello",
    base = "//dotnet:dotnet",
    cmd = [
        "/bin/Release/netcoreapp2.0/ubuntu.14.04-x64/publish/hello",
    ],
    files = [":bin"],
)

Running Tests

$ bazel test examples/dotnet:hello_test

Generating default binary files

The files under the examples/dotnet/bin/ folder is currently part of the repo but is generated by using the default dotnet commands:

cd examples/dotnet

dotnet restore
dotnet publish -c Release