FROM ubuntu:20.04

# install and configure munin
# hadolint ignore=DL3008

# hadolint ignore=DL3008
RUN apt-get update && \
	RUNLEVEL=1 DEBIAN_FRONTEND=noninteractive apt-get -y --no-install-recommends install \
		cron \
    munin \
    nginx \
    apache2 \
    wget \
    libapache2-mod-fcgid \
    libcgi-fast-perl \
    ssmtp \
		perl \
    mailutils \
    curl tzdata \
		munin-node \
    autoconf \
		libfile-readbackwards-perl \
	&& apt-get clean && \
	rm -rf /var/lib/apt/lists/* /var/tmp/* /tmp/*

RUN (cp /etc/munin/apache24.conf /etc/apache2/sites-available/000-default.conf) && \
    (sed -i 's/^Alias.*/Alias \/ \/var\/cache\/munin\/www\//g' /etc/apache2/sites-available/000-default.conf) && \
		(sed -i 's/Allow from .*/Satisfy Any/g' /etc/apache2/sites-available/000-default.conf) && \
    (sed -i 's/Order allow,deny.*/Allow from all/g' /etc/apache2/sites-available/000-default.conf) && \
    (mkdir -p /var/run/munin && \
    chown -R munin:munin /var/run/munin) && \
    (chfn -f 'munin' root) && \
    (/usr/sbin/a2enmod fcgid) && \
		rm -rf /etc/munin/plugins && \
		mkdir -p /etc/munin/plugins

COPY run.sh /usr/local/bin/run
COPY munin_stats /etc/munin/plugins/munin_stats
COPY munin_update /etc/munin/plugins/munin_update

RUN chmod +x /etc/munin/plugins/munin_stats && \
		chmod +x /etc/munin/plugins/munin_update && \
		chmod +x /usr/local/bin/run

COPY 000-default.conf /etc/apache2/sites-available/000-default.conf
COPY logrotate-munin /etc/logrotate.d/munin
COPY munin.conf /etc/munin/munin.conf
COPY ssmtp.conf /etc/ssmtp/ssmtp.conf
COPY revaliases /etc/ssmtp/revaliases
COPY munin_mail.conf /etc/munin/munin-conf.d/munin_mail.conf

# persist
VOLUME /var/lib/munin
VOLUME /var/log/munin
VOLUME /var/cache/munin

EXPOSE 80

# health check
HEALTHCHECK --interval=5m --timeout=3s \
  CMD curl -f http://localhost/munin/ || exit 1

# launcher
CMD ["/usr/local/bin/run"]