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docker: Reduce Docker image layers

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This patch halves the Docker image layers by following the best practice
of grouping some of the related commands together.

https://github.com/albertito/chasquid/pull/68

Amended-by: Alberto Bertogli <albertito@blitiri.com.ar>
  Adjusted commit message, adjust comment location.
This commit is contained in:
Guiorgy
2025-08-02 22:06:04 +04:00
committed by Alberto Bertogli
parent 3ff26fa145
commit 68ba0d2600
1 changed files with 17 additions and 22 deletions
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39
docker/Dockerfile
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@@ -11,8 +11,8 @@
FROM golang:latest AS build
WORKDIR /go/src/blitiri.com.ar/go/chasquid
COPY . .
RUN go get -d ./...
RUN go install ./...
RUN go get -d ./... && \
go install ./...
# Create the image.
FROM debian:stable
@@ -23,19 +23,16 @@ ENV DEBIAN_FRONTEND=noninteractive
# Install the packages we need.
# This includes chasquid, which sets up good defaults.
RUN apt-get update -q
RUN apt-get install -y -q \
chasquid \
dovecot-lmtpd dovecot-imapd dovecot-pop3d \
dovecot-sieve dovecot-managesieved \
acl libcap2-bin sudo certbot
RUN apt-get update -q && \
apt-get install -y -q \
chasquid \
dovecot-lmtpd dovecot-imapd dovecot-pop3d \
dovecot-sieve dovecot-managesieved \
acl libcap2-bin sudo certbot
# Copy the binaries. This overrides the debian packages with the ones we just
# built above.
COPY --from=build /go/bin/chasquid /usr/bin/
COPY --from=build /go/bin/chasquid-util /usr/bin/
COPY --from=build /go/bin/smtp-check /usr/bin/
COPY --from=build /go/bin/mda-lmtp /usr/bin/
COPY --from=build /go/bin/chasquid /go/bin/chasquid-util /go/bin/smtp-check /go/bin/mda-lmtp /usr/bin/
# Let chasquid bind privileged ports, so we can run it as its own user.
RUN setcap CAP_NET_BIND_SERVICE=+eip /usr/bin/chasquid
@@ -45,8 +42,7 @@ COPY docker/dovecot.conf /etc/dovecot/dovecot.conf
COPY docker/chasquid.conf /etc/chasquid/chasquid.conf
# Copy utility scripts.
COPY docker/add-user.sh /
COPY docker/entrypoint.sh /
COPY docker/add-user.sh docker/entrypoint.sh /
# chasquid: SMTP, submission, submission+tls.
EXPOSE 25 465 587
@@ -62,15 +58,14 @@ EXPOSE 80 443
VOLUME /data
# Put some directories where we expect persistent user data into /data.
RUN rmdir /etc/chasquid/domains/
RUN ln -sf /data/chasquid/domains/ /etc/chasquid/domains
RUN rm -rf /etc/letsencrypt/
RUN ln -sf /data/letsencrypt/ /etc/letsencrypt
# Give the chasquid user access to the necessary configuration.
RUN setfacl -R -m u:chasquid:rX /etc/chasquid/
RUN mv /etc/chasquid/certs/ /etc/chasquid/certs-orig
RUN ln -s /etc/letsencrypt/live/ /etc/chasquid/certs
RUN rmdir /etc/chasquid/domains/ && \
ln -sf /data/chasquid/domains/ /etc/chasquid/domains && \
rm -rf /etc/letsencrypt/ && \
ln -sf /data/letsencrypt/ /etc/letsencrypt && \
setfacl -R -m u:chasquid:rX /etc/chasquid/ && \
mv /etc/chasquid/certs/ /etc/chasquid/certs-orig && \
ln -s /etc/letsencrypt/live/ /etc/chasquid/certs
# NOTE: Set AUTO_CERTS="example.com example.org" to automatically obtain and