Cant access sdb disk when adding library

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Volume mounts for docker containers require a declaration. I like Portainer for a quick glimpse of what's up, but it's a UI layer of abstraction on top of so many already abstracted layers that it removes you from what's happening.

My advice? Think about the question @TheDreadPirate asked and think about what you want to learn. Linux? Focus on that and how to tackle installation, package manager, dependencies, permissions, etc. Docker and/or Compose? Run it from the terminal before you throw Portainer or another GUI at it. Get comfortable building run commands or Compose files, extending from individual compose files to a master, reading run commands into a compose format. Get used to the nomenclature and environment by picking your projects (you've done great by choosing a project you want to tackle) and then narrowing the focus on how you want to run it. Pick your OS, your virtualization, etc.

As it stands, you're asking questions about why an impractical setup that likely nobody else would have isn't working. It makes for difficult troubleshooting and I don't think will provide a useful learning experience for you.