# Usage

## Authentication

Do not forget to create and/or edit `~/.pgpass` file providing all needed passwords for each host:

The format is the following:
```properties
hostname:port:database:username:password
```

Example

```properties
localhost:5432:*:postgres:pg_password_1
localhost:5433:*:postgres:pg_password_2
```

## Scheduling

### Systemd

#### Service

`/etc/systemd/system/postgresql_backup.service`

```ini
[Unit]
Description=PostgreSQL backup Script

[Service]
Type=oneshot
WorkingDirectory=/root/scripts/postgresql_backup
ExecStart=/root/scripts/postgresql_backup/pg_backup.sh
```

#### Timer

`/etc/systemd/system/postgresql_backup.timer`

```ini
[Unit]
Description=Run Backup Script Every Night

[Timer]
OnCalendar=*-*-* 22:00:00
Unit=postgresql_backup.service

[Install]
WantedBy=timers.target
```

Then:

```shell
systemctl enable postgresql_backup.timer --now
```