loki/clients/cmd/promtail/Dockerfile.arm32

FROM golang:1.23-bullseye as build

COPY . /src/loki
WORKDIR /src/loki
# Backports repo required to get a libsystemd version 246 or newer which is required to handle journal +ZSTD compression
RUN echo "deb http://deb.debian.org/debian bullseye-backports main" >> /etc/apt/sources.list
RUN apt-get update && apt-get install -t bullseye-backports -qy libsystemd-dev
RUN make clean && make BUILD_IN_CONTAINER=false PROMTAIL_JOURNAL_ENABLED=true promtail

# Promtail requires debian or ubuntu as the base image to support systemd journal reading
FROM public.ecr.aws/ubuntu/ubuntu:noble
# tzdata required for the timestamp stage to work
# Backports repo required to get a libsystemd version 246 or newer which is required to handle journal +ZSTD compression
RUN echo "deb http://deb.debian.org/debian bullseye-backports main" >> /etc/apt/sources.list
RUN apt-get update && \
  apt-get install -qy \
  tzdata ca-certificates
RUN apt-get install -t bullseye-backports -qy libsystemd-dev && \
  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
COPY --from=build /src/loki/clients/cmd/promtail/promtail /usr/bin/promtail
COPY clients/cmd/promtail/promtail-local-config.yaml /etc/promtail/local-config.yaml
COPY clients/cmd/promtail/promtail-docker-config.yaml /etc/promtail/config.yml

# Drone CI builds arm32 images using armv8l rather than armv7l. Something in
# our build process above causes ldconfig to be rerun and removes the armhf
# library that debian:stretch-slim on ARM comes with. Symbolically linking to
# ld-linux.so.3 fixes the problem and allows Promtail to start.
#
# This process isn't necessary when building on armv7l so we only do it if the
# library was removed.
RUN sh -c '[ ! -f /lib/ld-linux-armhf.so.3 ] && echo RE-LINKING LD-LINUX-ARMHF.SO.3 && ln -s /lib/ld-linux.so.3 /lib/ld-linux-armhf.so.3'

ENTRYPOINT ["/usr/bin/promtail"]
CMD ["-config.file=/etc/promtail/config.yml"]