Dockerfile

FROM alpine:3.23.4

LABEL authors="nVentiveUX <https://github.com/nVentiveUX>"
LABEL license="MIT"
LABEL description="Docker image for syncthing installation. Think for ARM / x64 devices."

SHELL [ "/bin/ash", "-eo", "pipefail", "-c" ]

# User definition environment variables
ENV SYNCTHING_USER="syncthing" \
    SYNCTHING_USER_UID=1000 \
    SYNCTHING_GROUP="syncthing" \
    SYNCTHING_GROUP_GID=1000 \
    SYNCTHING_ADMIN_USER="admin" \
    SYNCTHING_VERSION="2.1.1" \
    SYNCTHING_ARCH="amd64"

RUN set -x \
    && apk add --no-cache \
    bash \
    coreutils \
    py3-bcrypt \
    py3-cryptography \
    shadow \
    su-exec \
    && tarball="syncthing-linux-${SYNCTHING_ARCH}-v${SYNCTHING_VERSION}.tar.gz" \
    && wget --quiet \
    "https://github.com/syncthing/syncthing/releases/download/v${SYNCTHING_VERSION}/$tarball" \
    "https://github.com/syncthing/syncthing/releases/download/v${SYNCTHING_VERSION}/sha256sum.txt.asc" \
    && grep -E " ${tarball}\$" sha256sum.txt.asc | sha256sum -c - \
    && rm -rf "$GNUPGHOME" sha256sum.txt.asc \
    && dir="$(basename "$tarball" .tar.gz)" \
    && bin="$dir/syncthing" \
    && tar -xvzf "$tarball" "$bin" \
    && rm "$tarball" \
    && mv "$bin" /usr/local/bin/syncthing \
    && rmdir "$dir" \
    && mkdir -p /etc/syncthing /var/lib/syncthing

COPY rootfs/ /

VOLUME ["/etc/syncthing", "/var/lib/syncthing"]

EXPOSE 8384/tcp 22000/tcp 22000/udp 21027/udp

ENTRYPOINT ["/docker-entrypoint.sh"]

CMD ["syncthing", "--home=/etc/syncthing", "--logflags=0"]