## PostgreSQL and pgAdmin
This example provides a base setup for using [PostgreSQL](https://www.postgresql.org/) and [pgAdmin](https://www.pgadmin.org/).
More details on how to customize the installation and the compose file can be found [here (PostgreSQL)](https://hub.docker.com/_/postgres) and [here (pgAdmin)](https://www.pgadmin.org/docs/pgadmin4/latest/container_deployment.html).

Project structure:
```
.
├── .env
├── docker-compose.yaml
└── README.md
```

[_docker-compose.yaml_](docker-compose.yaml)
``` yaml
services:
  postgres:
    image: postgres:latest
    ...
  pgadmin:
    image: dpage/pgadmin4:latest
```

## Configuration

### .env
Before deploying this setup, you need to configure the following values in the [.env](.env) file.
- POSTGRES_USER
- POSTGRES_PW
- POSTGRES_DB (can be default value)
- PGADMIN_MAIL
- PGADMIN_PW

## Deploy with docker-compose
When deploying this setup, the pgAdmin web interface will be available at port 5050 (e.g. http://localhost:5050).  

``` shell
$ docker-compose up
Starting postgres ... done
Starting pgadmin ... done
```

## Add postgres database to pgAdmin
After logging in with your credentials of the .env file, you can add your database to pgAdmin. 
1. Right-click "Servers" in the top-left corner and select "Create" -> "Server..."
2. Name your connection
3. Change to the "Connection" tab and add the connection details:
- Hostname: "postgres" (this would normally be your IP address of the postgres database - however, docker can resolve this container ip by its name)
- Port: "5432"
- Maintenance Database: $POSTGRES_DB (see .env)
- Username: $POSTGRES_USER (see .env)
- Password: $POSTGRES_PW (see .env)
  
## Expected result

Check containers are running:
```
$ docker ps
CONTAINER ID   IMAGE                           COMMAND                  CREATED             STATUS                 PORTS                                                                                  NAMES
849c5f48f784   postgres:latest                 "docker-entrypoint.s…"   9 minutes ago       Up 9 minutes           0.0.0.0:5432->5432/tcp, :::5432->5432/tcp                                              postgres
d3cde3b455ee   dpage/pgadmin4:latest           "/entrypoint.sh"         9 minutes ago       Up 9 minutes           443/tcp, 0.0.0.0:5050->80/tcp, :::5050->80/tcp                                         pgadmin
```

Stop the containers with
``` shell
$ docker-compose down
# To delete all data run:
$ docker-compose down -v
```
