Postgres for Rails setup that works, one shell script and database config

database.yml

default: &default
  timeout: 5000
  adapter: postgresql
  encoding: unicode
  database: sample_postgres_development
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: xxx
  password: xxx
  host: localhost
  port: 5432

development:
  <<: *default
  database: xxx

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: xxx_test

production:
  <<: *default
  database: xxx

run_postgres.sh

#!/bin/bash

CID=$(
	docker run -d -v xxx:/var/lib/postgresql/data \
	-p 127.0.0.1:5432:5432 -e POSTGRES_USER=xxx \
	-e POSTGRES_PASSWORD=xxx postgres
)
IPADDR=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' $CID)

cat << EOF
=== DOCKER INFO: ===
IP/PORT: $IPADDR:5432
=== COMMANDS HELP: ===
psql -U xxx
	Run PostgreSQL CLI
\c xxx
	Connect to the database
\dt+
	List tables in the database
exit
	Exit from PostgreSQL CLI
EOF

docker exec -ti $CID bash