diff --git a/Dockerfile b/Dockerfile
index b5acb73..7d9f5e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,26 @@
 FROM ubuntu:20.04
 
 # install and configure munin
-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
+# hadolint ignore=DL3008
+
+# hadolint ignore=DL3008
+RUN apt-get update && \
+	apt-get -y --no-install-recommends install \
+		cron \
+    munin \
+    nginx \
+    apache2 \
+    wget \
+    libapache2-mod-fcgid \
+    libcgi-fast-perl \
+    ssmtp \
+    mailutils \
+    curl tzdata \
+    autoconf
+	&& apt-get clean && \
+  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)
 RUN (sed -i 's/^Alias.*/Alias \/ \/var\/cache\/munin\/www\//g' /etc/apache2/sites-available/000-default.conf)
 RUN (sed -i 's/Allow from .*/Satisfy Any/g' /etc/apache2/sites-available/000-default.conf)