SimpleDockerfile.Alpine

FROM mcr.microsoft.com/dotnet/core/aspnet:2.2-alpine3.9

# Declare ports above 1024 as an unprivileged non-root user cannot bind to > 1024
ENV ASPNETCORE_URLS http://+:5000;https://+:5001
EXPOSE 5000
EXPOSE 5001

ENV USERNAME=appuser
ENV GROUP=grp
ENV HOME=/home/${USERNAME}

RUN mkdir -p ${HOME}

# Create a group and an user (system account) which will execute the app
# Alpine uses addgroup and adduser and not groupadd and useradd
RUN addgroup -S ${GROUP} && adduser -S ${USERNAME} -G ${GROUP} -h ${HOME} -s /sbin/nologin

# Setup the app directory
ENV APP_HOME=${HOME}/app
RUN mkdir ${APP_HOME}
WORKDIR ${APP_HOME}

# Copy in the application code
ADD . ${APP_HOME}

# Change the context to the app user
USER ${USERNAME}

# Alpine docker image doesn't have bash installed by default.
#RUN apk add --no-cache bash

ENTRYPOINT ["dotnet", "k8s-friendly-aspnetcore.dll"]