nginx-proxy/Dockerfile.alpine

# setup build arguments for version of dependencies to use
ARG NGINX_VERSION=1.19.3-alpine

ARG DOCKER_GEN_VERSION=0.7.4
ARG FOREGO_VERSION=0.16.1

# Use a specific version of golang to build both binaries
FROM golang:1.15.10-alpine as gobuilder
RUN apk add --no-cache git

# Build docker-gen from scratch
FROM gobuilder as dockergen

# Download the sources for the given version
ARG DOCKER_GEN_VERSION
ADD https://github.com/jwilder/docker-gen/archive/${DOCKER_GEN_VERSION}.tar.gz sources.tar.gz

# Move the sources into the right directory
RUN tar -xzf sources.tar.gz && \
   mkdir -p /go/src/github.com/jwilder/ && \
   mv docker-gen-* /go/src/github.com/jwilder/docker-gen

# Install the dependencies and make the docker-gen executable
WORKDIR /go/src/github.com/jwilder/docker-gen
RUN go get -v ./... && \
   CGO_ENABLED=0 GOOS=linux go build -ldflags "-X main.buildVersion=${DOCKER_GEN_VERSION}" ./cmd/docker-gen

# Build forego from scratch
# Because this relies on golang workspaces, we need to use go < 1.8. 
FROM gobuilder as forego

# Download the sources for the given version
ARG FOREGO_VERSION
ADD https://github.com/jwilder/forego/archive/v${FOREGO_VERSION}.tar.gz sources.tar.gz

# Move the sources into the right directory
RUN tar -xzf sources.tar.gz && \
   mkdir -p /go/src/github.com/ddollar/ && \
   mv forego-* /go/src/github.com/ddollar/forego

# Install the dependencies and make the forego executable
WORKDIR /go/src/github.com/ddollar/forego/
RUN go get -v ./... && \
   CGO_ENABLED=0 GOOS=linux go build -o forego .

# Build the final image
FROM nginx:$NGINX_VERSION
LABEL maintainer="Jason Wilder mail@jasonwilder.com"

# Install wget and install/updates certificates
RUN apk add --no-cache --virtual .run-deps \
    ca-certificates bash wget openssl \
    && update-ca-certificates


# Configure Nginx and apply fix for very long server names
RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
 && sed -i 's/worker_processes  1/worker_processes  auto/' /etc/nginx/nginx.conf

# Install Forego + docker-gen
COPY --from=forego /go/src/github.com/ddollar/forego/forego /usr/local/bin/forego
COPY --from=dockergen /go/src/github.com/jwilder/docker-gen/docker-gen /usr/local/bin/docker-gen

# Add DOCKER_GEN_VERSION environment variable
# Because some external projects rely on it
ARG DOCKER_GEN_VERSION
ENV DOCKER_GEN_VERSION=${DOCKER_GEN_VERSION}

COPY network_internal.conf /etc/nginx/

COPY . /app/
WORKDIR /app/

ENV DOCKER_HOST unix:///tmp/docker.sock

VOLUME ["/etc/nginx/certs", "/etc/nginx/dhparam"]

ENTRYPOINT ["/app/docker-entrypoint.sh"]
CMD ["forego", "start", "-r"]