Backing Up PostgreSQL Running in Another Docker Container

[xd003]

I'm currently running backrest in a Docker container and would like to back up a PostgreSQL database using pg_dump that is running in a separate Docker container. My plan is to use the CONDITION_SNAPSHOT_START hook to trigger a Bash script that executes the following command:

docker exec -e PGPASSWORD="mypass" <your_container_name_or_id> \
  pg_dump -Fc -h "${PG_HOST}" -p 5432 -d "${PG_DBNAME}" -U "${PG_USERNAME}" \
  > "${BACKUP_FILE_DB_POSTGRESQL}"

Given that backrest itself is running inside a container, what is the recommended approach to perform this kind of inter-container operation? This seems like a fairly common use case, so I'm wondering if there's a more standardized or seamless solution that others typically use to achieve this.

[xd003]

After reviewing similar discussions in the issues section, I've concluded that the simplest and most effective solution is to mount the Docker socket as a volume. This allows the Backrest container to directly reference other containers by their names.