Dockerfile

FROM ubuntu:20.04 as builder

WORKDIR /

RUN apt-get update && \
    apt-get install -y \
    curl \
    unzip \
    build-essential \
    autoconf \
    libgnutls28-dev \
    libgnutls28-dev \
    liblzo2-dev \
    libpam0g-dev \
    libtool \
    libssl-dev \
    net-tools

RUN curl -L https://github.com/OpenVPN/openvpn/archive/v2.5.1.zip -o openvpn.zip && \
    unzip openvpn.zip

COPY openvpn-v2.5.1-aws.patch openvpn-2.5.1

RUN cd openvpn-2.5.1 && \
    patch -p1 < openvpn-v2.5.1-aws.patch && \
    autoreconf -i -v -f && \
    ./configure && \
    make

RUN curl -L https://golang.org/dl/go1.15.4.linux-amd64.tar.gz -o go.tar.gz && \
    tar -C /usr/local -xzf go.tar.gz

ENV PATH=$PATH:/usr/local/go/bin

COPY server.go .

RUN go build server.go

FROM ubuntu:20.04

RUN apt-get update && \
    apt-get install -y \
    dnsutils \
    liblzo2-dev \
    openssl \
    net-tools

COPY --from=builder /openvpn-2.5.1/src/openvpn/openvpn /openvpn
COPY --from=builder /server /server
COPY entrypoint.sh /

ENTRYPOINT /entrypoint.sh