MailHog/Dockerfile

#
# MailHog Dockerfile
#

FROM golang:1.18-alpine as builder

# Install MailHog:
RUN apk --no-cache add --virtual build-dependencies \
    git \
  && mkdir -p /root/gocode \
  && export GOPATH=/root/gocode \
  && go install github.com/mailhog/MailHog@latest

FROM alpine:3
# Add mailhog user/group with uid/gid 1000.
# This is a workaround for boot2docker issue #581, see
# https://github.com/boot2docker/boot2docker/issues/581
RUN adduser -D -u 1000 mailhog

COPY --from=builder /root/gocode/bin/MailHog /usr/local/bin/

USER mailhog

WORKDIR /home/mailhog

ENTRYPOINT ["MailHog"]

# Expose the SMTP and HTTP ports:
EXPOSE 1025 8025
Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00			`#`
			`# MailHog Dockerfile`
			`#`
Example Dockerfile 2014-10-29 17:01:13 +00:00
Update Dockerfile to go1.18 syntax As of 1.18, `go get <package>` no longer builds executables. `go install` should be used to install an executable instead. See the deprecation message for more information: https://go.dev/doc/go-get-install-deprecation Pinning to a specific go Docker image will help keep things from breaking unexpectedly in the future 2022-03-17 19:15:45 +00:00			`FROM golang:1.18-alpine as builder`
Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00
			`# Install MailHog:`
			`RUN apk --no-cache add --virtual build-dependencies \`
			`git \`
			`&& mkdir -p /root/gocode \`
			`&& export GOPATH=/root/gocode \`
Update Dockerfile to go1.18 syntax As of 1.18, `go get <package>` no longer builds executables. `go install` should be used to install an executable instead. See the deprecation message for more information: https://go.dev/doc/go-get-install-deprecation Pinning to a specific go Docker image will help keep things from breaking unexpectedly in the future 2022-03-17 19:15:45 +00:00			`&& go install github.com/mailhog/MailHog@latest`
Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00
feat: use multistage build to minimize container size 2020-09-30 14:49:03 +00:00			`FROM alpine:3`
Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00			`# Add mailhog user/group with uid/gid 1000.`
			`# This is a workaround for boot2docker issue #581, see`
			`# https://github.com/boot2docker/boot2docker/issues/581`
			`RUN adduser -D -u 1000 mailhog`

feat: use multistage build to minimize container size 2020-09-30 14:49:03 +00:00			`COPY --from=builder /root/gocode/bin/MailHog /usr/local/bin/`

Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00			`USER mailhog`
Example Dockerfile 2014-10-29 17:01:13 +00:00
Optimise the Dockerfile for Docker Hub Automated Builds. Installs ca-certificates, required for the "release message" feature. With the current [mailhog/mailhog](https://hub.docker.com/r/mailhog/mailhog/) docker image, releasing messages to an SMTP server via TLS fails: > Failed to release message: x509: failed to load system roots and no roots > provided Removes any build dependencies after install, optimising docker image size. The image size is about the same as the Rocker based build, but works with plain Docker and can therefore be used via Docker Hub Automated Builds. Runs with a non-privileged user account instead of as root, increasing security. Assigning the user ID 1000 allows host volume mounts (e.g. for maildir storage) to work seamlessly with docker-machine. Installs MailHog in `/usr/local/bin`, which is in the system `PATH` and allows to use a simplified entrypoint (`MailHog`). 2016-10-23 10:42:22 +00:00			`WORKDIR /home/mailhog`

			`ENTRYPOINT ["MailHog"]`

			`# Expose the SMTP and HTTP ports:`
			`EXPOSE 1025 8025`