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How to choose a named stage in a Docker file to use by App Platform

Posted December 15, 2020 223 views
DockerDigitalOcean App Platform

I have a mono repo that has a multi-stage docker file and from that I’m trying to deploy two components (web service and static site).

Here is my docker file

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /app

COPY . .
RUN dotnet tool restore

RUN dotnet restore

RUN dotnet publish src/Server -c release -o /deploy/server

RUN dotnet fable src/Client

FROM node:12 AS client
WORKDIR /app
COPY --from=build /app ./
RUN npm install
RUN npm run build

FROM mcr.microsoft.com/dotnet/runtime:5.0 AS server
WORKDIR /deploy/server
COPY --from=build /deploy/server ./
EXPOSE 80
ENTRYPOINT ["dotnet", "Server.dll"]

My webservice component works fine as the server *stage is the last stage but the static site I’m not sure how to tell App Platform to stop at *client

From what I understand you can tell docker to stop at a specific stage.

What is the best way to achieve this using App Platform?

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TWith2Sugars
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TWith2Sugars

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1 answer
kamaln7 December 15, 2020

Hi @TWith2Sugars!

What I’d recommend is splitting your Dockerfiles into two, like so:

Dockerfile.server
FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /app

COPY . .
RUN dotnet tool restore

RUN dotnet restore

RUN dotnet publish src/Server -c release -o /deploy/server

RUN dotnet fable src/Client

FROM mcr.microsoft.com/dotnet/runtime:5.0 AS server
WORKDIR /deploy/server
COPY --from=build /deploy/server ./
EXPOSE 80
ENTRYPOINT ["dotnet", "Server.dll"]
Dockerfile.client
FROM node:12 AS client
WORKDIR /app
COPY . .
RUN npm install
RUN npm run build

Then, you can set the dockerfile_path property on your Service component to Dockerfile.server and Dockerfile.client on your Static Site component. Make sure to set the output directory on the Static Site to /app/dist or wherever the files are generated.

You’ll need to edit your app specification directly using doctl to set the dockerfile_path field.

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  • TWith2Sugars December 15, 2020
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  • TWith2Sugars December 18, 2020

    Thanks, I’ve done just that and it has worked.

    For anyone else who is using Fable/SAFE Stack this is my docker file:

    Docker.server

    FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /app

COPY . .
RUN dotnet tool restore

RUN dotnet restore

RUN dotnet publish src/Server -c release -o /deploy/server

# final stage/image
FROM mcr.microsoft.com/dotnet/runtime:5.0 AS server
WORKDIR /deploy/server
COPY --from=build /deploy/server ./
EXPOSE 80
ENTRYPOINT ["dotnet", "Server.dll"]

    Docker.client

    FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /app

COPY . .
RUN dotnet tool restore

RUN dotnet restore

RUN dotnet fable src/Client

FROM node:12 AS client
WORKDIR /app
COPY --from=build /app ./
RUN npm install
RUN npm run build
    Reply Report

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