How to install PostgreSQL and pgAdmin on Docker

In this article, we will look at how to install it in a Docker container using docker-compose as well.
 

But first, you need to update the OS packages.
 

apt update

Install the necessary packages and add a new repository:

apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt key add - add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"[/code] Update the packages with the new repository: 

apt update

Now let's install Docker itself.

apt-get install docker-ce docker-ce-cli containerd.io
Let's check the version:

docker --version

Let's check the status:

systemctl status docker

If it does not start, then run:

systemctl start docker

And add to autorun.

systemctl enable docker

curl -L "https://github.com/docker/compose/releases/download/1.25.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin /docker-compose

Set permissions to launch.

chmod +x /usr/local/bin/docker-compose

Check how Docker-Compose was installed:

docker-compose --version

Let's create a *.yaml file for Docker-Compose.

To navigate in the future in what we have installed, let's create a separate folder for this project in the /home directory and go to it.

mkdir /home/postgres && cd /home/postgres

You can also use a different directory to host this and other projects.

Let's use the repository to create the docker-compose.yaml file at https://hub.docker.com/_/postgres

Create a docker-compose.yaml or docker-compose.yml file,

vim docker-compose.yaml

And add the following code to it:

version: '3.8'
services:
  db_postgres:
    image:postgres
    container_name: postgres
    restart: always
    environment:
      POSTGRES_USER:root
      POSTGRES_PASSWORD: root
      POSTGRES_DB: test_db
    ports:
      - "54320:5432"
    volumes:
      - local_pgdаta:/var/lib/postgresql/data
  pgadmin4:
    container_name: pgadmin4
    image:dpage/pgadmin4
    restart: always
    environment:
      PGADMIN_DEFAULT_EMAIL: [email protected]
      PGADMIN_DEFAULT_PASSWORD: root
    ports:
      - "5050:80"
    volumes:
      - pgadmin-dаta:/var/lib/pgadmin
volumes:
  local_pgdаta:
  pgadmin-dаta:

Where:

container_name: name of your container;
POSTGRES_USER: The user for the database being created;
POSTGRES_PASSWORD: password for the user we are creating;
POSTGRES_DB: database name;
PGADMIN_DEFAULT_EMAIL: mail/user for authorization in pgadmin;
PGADMIN_DEFAULT_PASSWORD: password for the pgadmin user;
5050:80: the port on which pgadmin is running.

Run our script (for this you need to be in the directory where our file was created. In this case, it is /home/postgres):

docker-compose up -d

We are waiting for the download of images, and deployment.

We check:

docker-compose ps

or

docker ps

Now you can use the container IP with port 54320, or the name of the postgres container with port 54320 (IP:54320 or postgres:54320) to connect the database.

To view the logs, use the command

docker logs -f postgres

To configure pgadmin - open a browser and go to - http://YOUR_IP_SERVER:5050/ . In the connection details for the hostname, specify the postgreSQL container name or the mail that was specified in PGADMIN_DEFAULT_EMAIL and the root password


Now let's connect the postgreSQL database server to pgadmin4.


We enter the data indicated by docker-compose.yaml


Now you can create postgreSQL databases in pgadmin4.