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Raphael MANSUY
Raphael MANSUY

Posted on • Updated on • Originally published at elitizon.com

Postgres up and running in less than 3 minutes with docker-compose 🚀

Run Postgres using "docker-compose"

Create a local directory called "postgres"

$ mkdir postgres
$ cd ./postgres
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Create a "pgdata" directory inside "postgres" directory

$ cd ./postgres
$ mkdir ./pgdata
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👉 As a docker container is "stateless" we must create the directory "pgdata" to keep the data when the container is shut down.

Create a file called "docker-compose.yml" in "postgres" directory

$ touch ./docker-compose.yml
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📄 docker-compose.yml file

version: "3.8"
services:
  db:
    image: "postgres:13"
    ports:
      - "5432:5432"
    volumes:
      - ./pgdata:/var/lib/postgresql/data
    environment:
      - POSTGRES_USER=dbuser
      - POSTGRES_PASSWORD=admin2021
      - POSTGRES_DB=todoapp
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  • This file creates a host called "db" from a Postgres version 13 image. The TCP port 5432 (postgres) of the host "db" is exposed externally as TCP port 5432.

  • The local directory "./pgdata" is mapped as "/var/lib/postprogressql/data" inside the "db" host

  • The username, password and database name are exposed as an environment variable

Run the container in detached mode

$ docker-compose up -d
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List of running docker containers

$ docker-compose ps
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Run command inside the container

$ docker-compose run db bash
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Connect postgres inside the host

$ psql  --host=db --username=dbuser --dbname=todoapp
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Connect to "postgres" from outside

$ psql --host=localhost --username=dbuser --dbname=todoapp
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stop container

$ docker-compose down
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Et voilà 🎉 !

Discussion (3)

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kotrotko profile image
kotrotko • Edited on

Thank you so much, it is very useful for newbies like me) At the same time, if I try

psql --host=db --username=dbuser --dbname=todoapp

, I get

psql: error: could not translate host name "db" to address: nodename nor servname provided, or not known

. Other commands work as expected. What does it mean and how to fix it?

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nsmorisset profile image
nsmorisset

Hi,
For me it's ok with:
psql --host=database --username=dbuser --dbname=todoapp
but I do not know why

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timbogdanov profile image
Tim Bogdanov

question:
my set up is very similar, when booting up the container, and logining into psql with username db and host it create a different ip address for the database container every time, in the env of my project id have to constently change this. How could I hardcode localhost in the postgres docker-compose.yaml file, so that when ever i boot up the containers the db container will always host at 127.0.0.1?