PGPool2 3.7.5 at debian9 docker image

docker run -it --rm -v $(pwd)/pgpool.conf:/etc/pgpool/pgpool.conf smirart/pgpool:latest

docker-compose up -d

pgpool needs three configuration files: pgpool.conf, pcp.conf, pool_hba.conf. You can add your own conf-file to /etc/pgpool/ directory before use and docker-entrypoint will load that. Otherwise will be used standart configurations.