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Harden Dockerfile to match MCR production patterns

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Add ca-certificates and tzdata packages, fix user creation with proper
home directory and nologin shell, combine RUN commands into a single
layer, add VOLUME/WORKDIR declarations, and reorder USER after volume
setup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Kyle Isom
2026-03-26 21:02:05 -07:00
parent 5efd51b3d7
commit efd307f7fd
1 changed files with 17 additions and 2 deletions
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19
Dockerfile
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@@ -13,11 +13,26 @@ RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.version=${VERSION}"
FROM alpine:3.21
RUN addgroup -S mcns && adduser -S mcns -G mcns
RUN apk add --no-cache ca-certificates tzdata \
&& addgroup -S mcns \
&& adduser -S -G mcns -h /srv/mcns -s /sbin/nologin mcns \
&& mkdir -p /srv/mcns && chown mcns:mcns /srv/mcns
COPY --from=builder /build/mcns /usr/local/bin/mcns
# /srv/mcns is the single volume mount point.
# It must contain:
# mcns.toml — configuration file
# certs/ — TLS certificate and key
# mcns.db — created automatically on first run
VOLUME /srv/mcns
WORKDIR /srv/mcns
EXPOSE 53/udp 53/tcp
EXPOSE 8443
EXPOSE 9443
USER mcns
EXPOSE 53/udp 53/tcp 8443 9443
ENTRYPOINT ["mcns"]
CMD ["server", "--config", "/srv/mcns/mcns.toml"]