Icinga in Docker: which eMail client to use for notifications?

mcktr · January 19, 2021, 3:14pm

Hi,

I just saw that postfix is installed in the container.

Icinga/docker-icinga2/blob/68036a12182f7e7c047a9fd67714187bcb263169/deps.Dockerfile#L62


RUN cd /check_postgres ;\
	mkdir bin ;\
	perl Makefile.PL INSTALLSITESCRIPT=/usr/lib/nagios/plugins ;\
	make ;\
	make install "DESTDIR=$(pwd)/bin"
FROM debian:buster-slim
RUN ["/bin/bash", "-exo", "pipefail", "-c", "export DEBIAN_FRONTEND=noninteractive; apt-get update; apt-get install --no-install-{recommends,suggests} -y dumb-init libboost-{context,coroutine,date-time,filesystem,program-options,regex,system,thread}1.67 libedit2 libmariadb3 libmoosex-role-timer-perl libpq5 libssl1.1 mailutils monitoring-plugins openssh-client openssl postfix; apt-get clean; rm -vrf /var/lib/apt/lists/*"]
COPY --from=entrypoint /entrypoint/entrypoint /entrypoint
RUN ["adduser", "--system", "--group", "--home", "/var/lib/icinga2", "--disabled-login", "--force-badname", "--no-create-home", "--uid", "5665", "icinga"]
COPY --from=build /check_mssql_health/bin/ /
COPY --from=build /check_nwc_health/bin/ /
COPY --from=build /check_postgres/bin/ /
COPY --from=clone /check_ssl_cert/check_ssl_cert /usr/lib/nagios/plugins/check_ssl_cert

But for my understanding the postfix daemon is not usable since the container runs only one process: the Icinga 2 daemon, correct?

For me ssmtp or. msmtp looks promising, no running daemon is needed.

(german blog post)

Unfortunately the ssmtp debian package is currently unmaintained, msmtp looks like an alternative.

Both provide a symlink for sendmail, so sending E-Mails using mail should work.

Best regards
Michael