Attempt to prevent zombie processes when run under systemd
When systemd restarts the transmission-openvpn container, it seems to
leave zombie processes as below.
    $ ps uaxww | grep Z
    root      1872  0.0  0.0      0     0 ?        Z    08:58   0:00 [transmission-da] <defunct>
The zombies do appear to be cleaned up by restarting docker itself, or
by stopping the transmission-openvpn service.
This is an attempt to prevent zombies being spawned via Yelp's
dumb-init, which correctly handles the signals that PID1 gets.
See: https://github.com/Yelp/dumb-init
			
			
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		| @@ -16,6 +16,9 @@ RUN apt-get update \ | ||||
|     && apt-get update \ | ||||
|     && apt-get install -y transmission-cli transmission-common transmission-daemon \ | ||||
|     && apt-get install -y openvpn curl rar unrar zip unzip \ | ||||
|     && curl -sLO https://github.com/Yelp/dumb-init/releases/download/v1.0.1/dumb-init_1.0.1_amd64.deb \ | ||||
|     && dpkg -i dumb-init_*.deb \ | ||||
|     && rm -rf dumb-init_*.deb \ | ||||
|     && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \ | ||||
|     && curl -L https://github.com/jwilder/dockerize/releases/download/v0.0.2/dockerize-linux-amd64-v0.0.2.tar.gz | tar -C /usr/local/bin -xzv | ||||
|  | ||||
| @@ -101,4 +104,4 @@ ENV OPENVPN_USERNAME=**None** \ | ||||
|  | ||||
| # Expose port and run | ||||
| EXPOSE 9091 | ||||
| CMD ["/etc/openvpn/start.sh"] | ||||
| CMD ["dumb-init", "/etc/openvpn/start.sh"] | ||||
|   | ||||
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