Now I share with everyone how to install PostgreSQL using Docker Compose . When it comes to Docker, everyone has probably used it before. In previous articles I also shared about Docker , you can review it here.

Create A Application Laravel 8 + Docker

Create A Example Application Web PHP + Docker (Phpmyadmin , Mysql , Nginx)

First, create yourself a docker-compose.yml file and copy the code

version: '3.8'
services:
    postgres_db:
        image: postgres:13.5
        container_name: PostgresCount
        restart: always
        environment:
            - POSTGRES_USER=hoadev
            - POSTGRES_PASSWORD=hoadev123
            - POSTGRES_DB=hoadev_db
        volumes:
            - postgres_db:/var/lib/postgresql/data
        ports:
            - '5432:5432'
volumes:
    postgres_db:
        driver: local

• version : specifies the version of the Docker Compose file. In my case, it is "3.8".

• service : defines the services that need to be executed using Docker Compose

• postgres_db : is the name of the Postgres service.

• image : defines the image to use, i.e. "postgres:latest ".

• container_name : represents the container name, i.e. PostgresCont . it is the name of the container

• environment : set environment variables in Postgresql. For example: POSTGRES_USER , POSTGRES_PASSWORD , POSTGRES_DB ,...

• port : set the communication port for it " 5432:5432 "

• volumes : set up a volume to persist Postgres data

Okay, now let's open the command and run the command to run it

docker-compose up -d
docker-compose ps

Above you have run successfully, you will see the name of the container is "PostgresCount"

Now our job is to run the bash command, to access the container

docker-compose exec -it <container-name>

Here our container name is "PostgresCount" so we will run the following command:

docker-compose exec -it PostgresCount bash

If you run the above command and you encounter this message:

service "PostgresCount" is not running

Don't worry, we have a way to run the above command, by directly running the name of the service "postgres_db"

docker-compose exec -it postgres_db bash

Okay, now that you're in root, the next thing is to login to postgres

# psql -U <user> -d <database>

user : user name that we installed in the environment, of the docker-compose.yml file

database : the database name is also named in the environment****

# psql -U hoadev -d hoadev_db

You can run the command \l to display all databases

Okay, you have successfully entered this point, the rest you just need to write a few query statements in SQL like (create, read, delete, select,....)

Okay, let's learn more about query statements in postgresql to test, see you in the next sharing post. You can see more here:

How To Create Data Queries in PostgreSQL By Using the Select Command

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The article : Install PostgreSQL Using Docker Compose