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‎README.md

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# postgres-with-pgpool2
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This Dockerfile is a mix of postgres and docker-pgpool2.
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THIS IS A WORK IN PROGRESS, DON'T USE IT FOR NOW.
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Default users/passwords are docker/docker.
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Connect to pgpoolAdmin using your web browser pointed at the port mapped to 80.
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Connect your pg client to the port mapped to 9999.
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Some settings you may wish to change:
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* listen_addresses: to `*` so pgpool allows connections from anywhere
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* enable_pool_hba: on so you can use md5 auth (using PG_REPL_USER/PG_REPL_PASS)
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‎pgpool2/Dockerfile

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FROM postgres:9.4
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RUN apt-get update
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# We'll need postgresql-server-dev-9.4 to build pgpool extensions,
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# apache and php to run pgpoolAdmin
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RUN apt-get install -y postgresql-server-dev-9.4 apache2 libapache2-mod-php5 curl build-essential
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RUN curl -L -o pgpool-II-3.4.0.tar.gz http://www.pgpool.net/download.php?f=pgpool-II-3.4.0.tar.gz
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RUN tar zxvf pgpool-II-3.4.0.tar.gz
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# Build pgpool2
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WORKDIR /pgpool-II-3.4.0
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RUN ./configure
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RUN make & make install
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# Build pgpool2 extensions for postgres
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WORKDIR /pgpool-II-3.4.0/src/sql
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RUN make & make install
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RUN ldconfig
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# clean up
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RUN rm -rf /pgpool-II-3.4.0 & rm /pgpool-II-3.4.0.tar.gz
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# Install pgpoolAdmin
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WORKDIR /var/www
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RUN rm index.html
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RUN curl -O http://www.pgpool.net/mediawiki/images/pgpoolAdmin-3.2.2.tar.gz
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RUN tar --strip-components=1 -zxvf pgpoolAdmin-3.2.2.tar.gz
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ENV APACHE_RUN_USER www-data
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ENV APACHE_RUN_GROUP www-data
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ENV APACHE_LOG_DIR /var/log/apache2
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ENV PG_REPL_USER docker
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ENV PG_REPL_PASS docker
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ENV PCP_USER docker
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ENV PCP_PASS docker
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ADD ./pgmgt.conf.php /var/www/conf/
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ADD ./pool_hba.conf /usr/local/etc/
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ADD setup.sh /var/www/
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RUN sh ./setup.sh
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EXPOSE 80
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EXPOSE 9999
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# Add pgpool extension to the database template
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ADD init_sql.sh /docker-entrypoint-initdb.d/

‎pgpool2/init_sql.sh

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#!/bin/bash
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echo "******CREATING PGPOOL EXTENSIONS******"
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gosu postgres postgres --single template1 <<- EOSQL
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CREATE EXTENSION pgpool_regclass;
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CREATE EXTENSION pgpool_recovery;
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CREATE EXTENSION pgpool_adm
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EOSQL

‎pgpool2/pgmgt.conf.php

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<?php
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define('_PGPOOL2_LANG', 'en');
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define('_PGPOOL2_CONFIG_FILE', '/usr/local/etc/pgpool.conf');
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define('_PGPOOL2_PASSWORD_FILE', '/usr/local/etc/pcp.conf');
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define('_PGPOOL2_COMMAND', '/usr/local/bin/pgpool');
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define('_PGPOOL2_CMD_OPTION_C', '0');
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define('_PGPOOL2_CMD_OPTION_LARGE_D', '0');
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define('_PGPOOL2_CMD_OPTION_D', '0');
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define('_PGPOOL2_CMD_OPTION_M', 'f');
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define('_PGPOOL2_CMD_OPTION_N', '1');
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define('_PGPOOL2_LOG_FILE', '/tmp/pgpool.log');
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define('_PGPOOL2_PCP_DIR', '/usr/local/bin');
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define('_PGPOOL2_PCP_HOSTNAME', 'localhost');
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define('_PGPOOL2_PCP_TIMEOUT', '10');
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define('_PGPOOL2_STATUS_REFRESH_TIME', '10');
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?>

‎pgpool2/pool_hba.conf

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# pgpool Client Authentication Configuration File
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# ===============================================
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#
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# The format rule in this file follows the rules in the PostgreSQL
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# Administrator's Guide. Refer to chapter "Client Authentication" for a
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# complete description. A short synopsis follows.
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#
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# This file controls: which hosts are allowed to connect, how clients
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# are authenticated, which user names they can use, which databases they
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# can access. Records take one of these forms:
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#
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# local DATABASE USER METHOD [OPTION]
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# host DATABASE USER CIDR-ADDRESS METHOD [OPTION]
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#
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# (The uppercase items must be replaced by actual values.)
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#
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# The first field is the connection type: "local" is a Unix-domain
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# socket, "host" is either a plain or SSL-encrypted TCP/IP socket.
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#
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# DATABASE can be "all", "sameuser", a database name, or a comma-separated
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# list thereof. Note that "samegroup" like in PostgreSQL's pg_hba.conf
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# file is not supported, since pgpool does not know which group a user
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# belongs to. Also note that the database specified here may not exist in
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# the backend PostgreSQL. pgpool will authenticate based on the database's
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# name, not based on whether it exists or not.
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#
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# USER can be "all", a user name, or a comma-separated list thereof. In
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# both the DATABASE and USER fields you can also write a file name prefixed
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# with "@" to include names from a separate file. Note that a group name
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# prefixed with "+" like in PostgreSQL's pg_hba.conf file is not supported
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# because of the same reason as "samegroup" token. Also note that a user
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# name specified here may not exist in the backend PostgreSQL. pgpool will
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# authenticate based on the user's name, not based on whether he/she exists.
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#
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# CIDR-ADDRESS specifies the set of hosts the record matches.
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# It is made up of an IP address and a CIDR mask that is an integer
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# (between 0 and 32 (IPv4) that specifies the number of significant bits in
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# the mask. Alternatively, you can write an IP address and netmask in
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# separate columns to specify the set of hosts.
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#
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# METHOD can be "trust", "reject", "md5" or "pam". Note that "pam" sends passwords
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# in clear text.
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#
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# OPTION is the name of the PAM service. Default service name is "pgpool"
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#
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# Database and user names containing spaces, commas, quotes and other special
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# characters must be quoted. Quoting one of the keywords "all" or "sameuser"
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# makes the name lose its special character, and just match a database or
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# username with that name.
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#
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# This file is read on pgpool startup. If you edit the file on a running
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# system, you have to restart the pgpool for the changes to take effect.
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# Put your actual configuration here
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# ----------------------------------
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#
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# If you want to allow non-local connections, you need to add more
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# "host" records. In that case you will also need to make pgpool listen
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# on a non-local interface via the listen_addresses configuration parameter.
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#
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# TYPE DATABASE USER CIDR-ADDRESS METHOD
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# "local" is for Unix domain socket connections only
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local all all trust
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# IPv4 local connections:
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host all all 0.0.0.0/0 md5

‎pgpool2/setup.sh

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chown -R www-data .
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chmod 755 /usr/local/bin/pgpool
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chmod 755 /usr/local/bin/pcp_*
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chmod 777 templates_c
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chmod 644 conf/pgmgt.conf.php
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cp /usr/local/etc/pgpool.conf.sample /usr/local/etc/pgpool.conf
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cp /usr/local/etc/pcp.conf.sample /usr/local/etc/pcp.conf
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chown -R www-data /usr/local/etc
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echo ${PCP_USER}:`pg_md5 ${PCP_PASS}` >> /usr/local/etc/pcp.conf
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mkdir /var/run/pgpool
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chown www-data /var/run/pgpool
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rm -rf /var/www/install
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cd /usr/local/etc
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pg_md5 -m -u $PG_REPL_USER $PG_REPL_PASS
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chown www-data pool_passwd

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