build: change base centos:7 => debian:9 , dropping pgxc_ctl

As noted in the README for a couple of years, pgxc_ctl is no longer the
recommended way of using Postgres-XL Docker. In this build upgrade, it's
no longer compiled or included in the image, either.

Dockerfile

@@ -1,57 +1,39 @@
 #===============================================================================
-FROM centos:7
-
-MAINTAINER tiredpixel <tiredpixel@posteo.de>
+FROM debian:9
 
 ARG PG_HOME=/var/lib/postgresql
 ARG PG_LIB=/usr/local/lib/postgresql
 ARG PG_USER=postgres
 ARG PG_USER_HEALTHCHECK=_healthcheck
 #-------------------------------------------------------------------------------
-RUN yum -y install \
-        automake \
+RUN apt-get update && \
+    apt-get install -y \
         bison \
+        build-essential \
+        daemontools \
         flex \
-        gcc \
-        gcc-c++ \
-        git \
-        kernel-devel \
-        make \
-        readline-devel \
-        zlib-devel \
-    && \
-    yum clean all
+        libreadline-dev \
+        zlib1g-dev && \
+    rm -rf /var/lib/apt/lists/*
 
-RUN useradd ${PG_USER} -d ${PG_HOME} \
-    && \
-    mkdir -p ${PG_LIB} ${PG_HOME} \
-    && \
+RUN useradd ${PG_USER} -d ${PG_HOME} && \
+    mkdir -p ${PG_LIB} ${PG_HOME} && \
     chown -R ${PG_USER}:${PG_USER} ${PG_LIB} ${PG_HOME}
-
+#-------------------------------------------------------------------------------
 WORKDIR ${PG_HOME}
 
-COPY lib/ ./lib/
-RUN chown -R ${PG_USER}:${PG_USER} ${PG_HOME}
+COPY --chown=postgres:postgres lib/ ./lib/
 #-------------------------------------------------------------------------------
 USER ${PG_USER}
 
 WORKDIR ${PG_HOME}/lib/postgres-xl
 
-RUN ./configure --prefix ${PG_LIB} \
-    && \
-    make \
-    && \
-    cd contrib/pgxc_ctl \
-    && \
+RUN ./configure --prefix ${PG_LIB} && \
     make
 #-------------------------------------------------------------------------------
 USER root
 
-RUN make install \
-    && \
-    cd contrib/pgxc_ctl \
-    && \
-    make install
+RUN make install
 #-------------------------------------------------------------------------------
 USER ${PG_USER}
 

README.md

@@ -13,10 +13,7 @@ Previously, Postgres-XL Docker used pgxc_ctl for initialisation and control,
 running SSH servers as well as database services. This has now been completely
 redesigned to run database services directly without SSH, initialising using
 included helper scripts, and allowing full flexibility with regard to cluster
-topologies.
-
-The pgxc_ctl binary continues to be compiled and provided in the image in case
-people find it useful, but this might change in the future, since the up-to-date
+topologies. The pgxc_ctl binary is no longer included in the image, since the
 recommended Postgres-XL Docker workflow is to *not* use it.