Can't edit my comment (#2) so I just wanted to correct the sentence
"That's (most likely) the reason why the official HAProxy docker image
builds on Alpine Linux which uses Open RC as init system.". The official
HAProxy Docker image runs on Debian but also supports Alpine Linux. The
big difference there: They don't install HAProxy from a deb package but
rather build HAProxy from source (during image build).

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https://bugs.launchpad.net/bugs/1855140

Title:
  haproxy package misses creation of default stats socket path in Docker
  container

Status in haproxy package in Ubuntu:
  New

Bug description:
  When installing the haproxy package from the current Ubuntu 18.04
  Bionic repos, the package does not install the directory /run/haproxy.
  This directory is mentioned in the default config file
  /etc/haproxy/haproxy.cfg:

   stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd
  listeners

  Starting HAProxy manually will show the following error:

  # /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg
  [ALERT] 337/154339 (24) : Starting frontend GLOBAL: cannot bind UNIX socket 
[/run/haproxy/admin.sock]

  After manual creation of the directory, the start works:

  # mkdir /run/haproxy

  # /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg

  # ps auxf
  USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
  root        10  0.1  0.0  18616  3416 pts/0    Ss   15:42   0:00 /bin/bash
  root        32  0.0  0.0  34400  2900 pts/0    R+   15:45   0:00  \_ ps auxf
  root         1  0.0  0.0  18376  3016 ?        Ss   15:40   0:00 bash 
/root/entrypoint.sh
  haproxy     31  0.0  0.0  54284  1252 ?        Ss   15:45   0:00 
/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg

  This can be reproduced with a simple Docker container the following
  Dockerfile:

  ----------------------------------------------
  FROM ubuntu:18.04
  MAINTAINER Claudio Kuenzler <c...@claudiokuenzler.com>

  # install packages
  RUN apt-get update \
    && apt-get install -y -qq haproxy

  CMD ["/usr/sbin/haproxy","-f","/etc/haproxy/haproxy.cfg"]
  ----------------------------------------------

  Checking the haproxy package for the run directory shows nothing:

  # dpkg -L haproxy | grep run ; date
  Wed Dec  4 15:58:52 UTC 2019

  *******************************************

  Update: After analysis of the haproxy package (see
  https://www.claudiokuenzler.com/blog/917/haproxy-ubuntu-18.04-docker-
  image-not-starting-cannot-bind-unix-socket), it turns out that the
  /run/haproxy directory is defined in debian/haproxy.tmpfile. However
  tmpfile's are only considered in systems with SystemD. As Docker
  containers run without Systemd, this directory is never created.

  Suggestion: Do not rely on Systemd to create /run/haproxy. Maybe use
  debian/haproxy.dirs? However the permissions are not set in this case.

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