It's probably complaining about the relative path, try replacing `-v ./pg-data:/...

drewsberry 5 months ago | parent | context | favorite | on: How Postgres stores data on disk – this one's a pa...

It's probably complaining about the relative path, try replacing `-v ./pg-data:/var/lib/postgresql/data` with `-v "$PWD/pg-data:/var/lib/postgresql/data"`