Switch from my_init to dumb-init, avoiding python3 dependency

We're using version 1.2.0 of dumb-init, the latest stable version.

Author: robinsmidsrod

Dockerfile

@@ -7,11 +7,11 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get -q -y update \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install apt-utils \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" dist-upgrade \
- && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install isc-dhcp-server man python3 \
+ && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install isc-dhcp-server man \
  && apt-get -q -y autoremove \
  && apt-get -q -y clean \
  && rm -rf /var/lib/apt/lists/*
 
-COPY util/my_init.py /sbin/my_init
+COPY util/dumb-init_1.2.0_amd64 /usr/bin/dumb-init
 COPY util/entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -55,12 +55,12 @@ This image uses the following software components:
 
  * Ubuntu Linux distribution from <https://www.ubuntu.com>.
  * ISC DHCP server from <https://www.isc.org/downloads/dhcp/>.
- * Docker-optimized my_init from <https://github.com/phusion/baseimage-docker>.
+ * Dumb-init from <https://github.com/Yelp/dumb-init>.
 
 Copyright & License
 ===================
 
-This project is copyright 2016 Robin Smidsrød <[email protected]>.
+This project is copyright 2017 Robin Smidsrød <[email protected]>.
 
 It is licensed under the Apache 2.0 license.
 

util/dumb-init_1.2.0_amd64

@@ -13,7 +13,7 @@ if [ -z "$1" ]; then
     IFACE=" "
 fi
 
-init="/sbin/my_init --skip-startup-files --skip-runit"
+init="/usr/bin/dumb-init"
 
 if [ -n "$IFACE" ]; then
     # Run dhcpd for specified interface or all interfaces