Add pgbouncer

net/pgbouncer/Dockerfile

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+FROM ubuntu:14.04
+
+RUN apt-get update && apt-get -y install wget
+RUN wget --quiet --no-check-certificate -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
+RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list
+RUN apt-get update
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install pgbouncer
+
+ADD run.sh /run.sh
+
+EXPOSE 5432
+CMD /run.sh

net/pgbouncer/README.md

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+# `docker-pgbouncer`
+
+docker image for pgbouncer
+
+Example usage:
+`docker run -i -t -d -p 6432:6432 --link postgres:pg xena/docker-pgbouncer`
+
+This requires a link (named pg) to a postgres container or manually configured 
+environment variables as follows:
+
+`PG_PORT_5432_TCP_ADDR` (default: <empty>)
+
+`PG_PORT_5432_TCP_PORT` (default: <empty>)
+
+`PG_ENV_POSTGRESQL_USER` (default: <empty>)
+
+`PG_ENV_POSTGRESQL_PASS` (default: <empty>)
+
+Based on https://github.com/mbentley/dockerfiles/tree/master/ubuntu/pgbouncer

net/pgbouncer/run.sh

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+#!/bin/bash
+set -e
+
+PG_PORT_5432_TCP_ADDR=${PG_PORT_5432_TCP_ADDR:-}
+PG_PORT_5432_TCP_PORT=${PG_PORT_5432_TCP_PORT:-}
+PG_ENV_POSTGRESQL_USER=${PG_ENV_POSTGRESQL_USER:-}
+PG_ENV_POSTGRESQL_PASS=${PG_ENV_POSTGRESQL_PASS:-}
+
+if [ ! -f /etc/pgbouncer/pgbconf.ini ]
+then
+cat << EOF > /etc/pgbouncer/pgbconf.ini
+[databases]
+* = host=${PG_PORT_5432_TCP_ADDR} port=${PG_PORT_5432_TCP_PORT}
+
+[pgbouncer]
+logfile = /var/log/postgresql/pgbouncer.log
+pidfile = /var/run/postgresql/pgbouncer.pid
+;listen_addr = *
+listen_addr = 0.0.0.0
+listen_port = 5432
+unix_socket_dir = /var/run/postgresql
+;auth_type = any
+auth_type = trust
+auth_file = /etc/pgbouncer/userlist.txt
+pool_mode = session
+server_reset_query = DISCARD ALL
+max_client_conn = 100
+default_pool_size = 20
+ignore_startup_parameters = extra_float_digits
+EOF
+fi
+
+if [ ! -s /etc/pgbouncer/userlist.txt ]
+then
+	echo '"'"${PG_ENV_POSTGRESQL_USER}"'" "'"${PG_ENV_POSTGRESQL_PASS}"'"'  > /etc/pgbouncer/userlist.txt
+fi
+
+chown -R postgres:postgres /etc/pgbouncer
+chown root:postgres /var/log/postgresql
+chmod 1775 /var/log/postgresql
+chmod 640 /etc/pgbouncer/userlist.txt
+
+/usr/sbin/pgbouncer -u postgres /etc/pgbouncer/pgbconf.ini