diff --git a/Dockerfile b/Dockerfile
index 00b7816..645f442 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,30 +3,29 @@ FROM ubuntu:20.04
 # install and configure munin
 # hadolint ignore=DL3008
 RUN apt-get update -qq \
-    && RUNLEVEL=1 \
     DEBIAN_FRONTEND=noninteractive \
     apt-get install -y -qq cron munin nginx apache2 wget libapache2-mod-fcgid libcgi-fast-perl ssmtp mailutils curl tzdata autoconf --no-install-recommends \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-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
+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)
 
-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
-COPY slack_munin.sh /usr/local/bin/notify_slack_munin
-RUN chmod +x /usr/local/bin/notify_slack_munin
-COPY munin_slack.conf /etc/munin/munin-conf.d/munin_slack.conf
+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)
+COPY (slack_munin.sh /usr/local/bin/notify_slack_munin)
+RUN (chmod +x /usr/local/bin/notify_slack_munin)
+COPY (munin_slack.conf /etc/munin/munin-conf.d/munin_slack.conf)
 
 # copy launcher
 COPY run.sh /usr/local/bin/run