How to backup localhost databases

Learn how to configure Postgresus to backup PostgreSQL databases running on your host machine (localhost) when using Docker.

The problem

If you're running Postgresus in Docker and want to back up databases running on your host machine (localhost), you need to configure Docker to use host network mode.

By default, Docker containers run in an isolated network and cannot access services on localhost. The host network mode allows the container to share the host's network namespace.

Solution for Docker Compose

Update your docker-compose.yml file to use network_mode: host:

services:
  postgresus:
    container_name: postgresus
    image: rostislavdugin/postgresus:latest
    network_mode: host
    volumes:
      - ./postgresus-data:/postgresus-data
    restart: unless-stopped

Solution for Docker run

Use the --network host flag:

docker run -d \
  --name postgresus \
  --network host \
  -v ./postgresus-data:/postgresus-data \
  --restart unless-stopped \
  rostislavdugin/postgresus:latest