from image to Debian Buster (10)

Dockerfile

@@ -1,9 +1,7 @@
-# start from debian 9 slim version
-FROM debian:stretch-slim
-
-# enable backport repo
-RUN echo deb http://httpredir.debian.org/debian stretch-backports main | tee /etc/apt/sources.list.d/backports.list
+# start from debian 10 slim version
+FROM debian:buster-slim
 
+# install certbot, supervisor and utilities
 RUN apt-get update && apt-get install --no-install-recommends -yqq \
     gnupg \
     apt-transport-https \
@@ -12,18 +10,17 @@ RUN apt-get update && apt-get install --no-install-recommends -yqq \
     ca-certificates \
     curl \
     procps \
-    && apt-get install --no-install-recommends -yqq certbot -t stretch-backports \
+    && apt-get install --no-install-recommends -yqq certbot \
     && apt-get install --no-install-recommends -yqq supervisor \
     && apt-get clean autoclean && apt-get autoremove -y \
     && rm -rf /var/lib/apt/lists/*
 
 # install haproxy from official debian repos (https://haproxy.debian.net/)
 
 RUN curl https://haproxy.debian.net/bernat.debian.org.gpg | apt-key add -
-RUN echo deb http://haproxy.debian.net stretch-backports-2.0 main | tee /etc/apt/sources.list.d/haproxy.list
-
+RUN echo deb http://haproxy.debian.net buster-backports-2.0 main | tee /etc/apt/sources.list.d/haproxy.list
 RUN apt-get update \
-    && apt-get install -yqq haproxy=2.0.\* -t stretch-backports \
+    && apt-get install -yqq haproxy=2.0.\* \
     && apt-get clean autoclean && apt-get autoremove -y \
     && rm -rf /var/lib/apt/lists/*