Dockerfile

FROM alpine:3.20.1 as openssl-builder

ENV OPENSSL_URL https://www.openssl.org/source/openssl-3.3.1.tar.gz
ENV OPENSSL_SHA256 777cd596284c883375a2a7a11bf5d2786fc5413255efab20c50d6ffe6d020b7e

RUN set -eux; \
  \
  apk add --no-cache \
    build-base \
    perl \
    wget \
    tar \
    linux-headers

RUN set -eux; \
  \
  wget -O openssl.tar.gz "$OPENSSL_URL"; \
  echo "$OPENSSL_SHA256 *openssl.tar.gz" | sha256sum -c; \
  mkdir -p /usr/src/openssl; \
  tar -xzf openssl.tar.gz -C /usr/src/openssl --strip-components=1; \
  rm openssl.tar.gz; \
  cd /usr/src/openssl; \
  ./config \
    --prefix=/opt/openssl \
    --openssldir=/opt/openssl \
    enable-ssl3 \
    enable-ssl3-method \
    no-tests \
    no-shared; \
  nproc="$(getconf _NPROCESSORS_ONLN)"; \
  eval "make -j '$nproc'"; \
  eval "make install_sw install_ssldirs"; \
  cd /; \
  rm -rf /usr/src/openssl


FROM alpine:3.20.1

# runtime dependencies
RUN set -eux; \
  apk add --no-cache \
# @system-ca: https://github.com/docker-library/haproxy/pull/216
    ca-certificates \
  ;

# roughly, https://git.alpinelinux.org/aports/tree/main/haproxy/haproxy.pre-install?h=3.12-stable
RUN set -eux; \
  addgroup --gid 99 --system haproxy; \
  adduser \
    --disabled-password \
    --home /var/lib/haproxy \
    --ingroup haproxy \
    --no-create-home \
    --system \
    --uid 99 \
    haproxy \
  ; \
  mkdir /var/lib/haproxy; \
  chown haproxy:haproxy /var/lib/haproxy

COPY --from=openssl-builder /opt/openssl /opt/openssl

ENV HAPROXY_VERSION 3.0.2
ENV HAPROXY_URL https://www.haproxy.org/download/3.0/src/haproxy-3.0.2.tar.gz
ENV HAPROXY_SHA256 9672ee43b109f19356c35d72687b222dcf82b879360c6e82677397376cf5dc36

# see https://sources.debian.net/src/haproxy/jessie/debian/rules/ for some helpful navigation of the possible "make" arguments
RUN set -eux; \
  \
  apk add --no-cache --virtual .build-deps \
    gcc \
    musl-dev \
    linux-headers \
    lua5.4-dev \
    make \
    pcre2-dev \
    readline-dev \
    tar \
  ; \
  \
  wget -O haproxy.tar.gz "$HAPROXY_URL"; \
  echo "$HAPROXY_SHA256 *haproxy.tar.gz" | sha256sum -c; \
  mkdir -p /usr/src/haproxy; \
  tar -xzf haproxy.tar.gz -C /usr/src/haproxy --strip-components=1; \
  rm haproxy.tar.gz; \
  \
  makeOpts=' \
    TARGET=linux-musl \
    USE_GETADDRINFO=1 \
    USE_LUA=1 LUA_INC=/usr/include/lua5.4 LUA_LIB=/usr/lib/lua5.4 \
    USE_OPENSSL=1 SSL_INC=/opt/openssl/include SSL_LIB=/opt/openssl/lib64 \
    USE_PCRE2=1 USE_PCRE2_JIT=1 \
    USE_PROMEX=1 \
    \
    EXTRA_OBJS=" \
    " \
  '; \
  \
  nproc="$(getconf _NPROCESSORS_ONLN)"; \
  eval "make -C /usr/src/haproxy -j '$nproc' all $makeOpts"; \
  eval "make -C /usr/src/haproxy install-bin $makeOpts"; \
  \
  mkdir -p /usr/local/etc/haproxy; \
  cp -R /usr/src/haproxy/examples/errorfiles /usr/local/etc/haproxy/errors; \
  rm -rf /usr/src/haproxy; \
  \
  runDeps="$( \
    scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
      | tr ',' '\n' \
      | sort -u \
      | awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
  )"; \
  apk add --no-network --virtual .haproxy-rundeps $runDeps; \
  apk del --no-network .build-deps; \
  \
# smoke test
  haproxy -v

# https://www.haproxy.org/download/1.8/doc/management.txt
# "4. Stopping and restarting HAProxy"
# "when the SIGTERM signal is sent to the haproxy process, it immediately quits and all established connections are closed"
# "graceful stop is triggered when the SIGUSR1 signal is sent to the haproxy process"
STOPSIGNAL SIGUSR1

COPY docker-entrypoint.sh /

USER haproxy

# https://github.com/docker-library/haproxy/issues/200
WORKDIR /var/lib/haproxy

ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["haproxy", "-f", "/usr/local/etc/haproxy/haproxy.cfg"]