This document discusses storage options for Docker containers and images. It introduces different storage drivers that can be used, such as AUFS, BTRFS, DeviceMapper, Overlay, and Overlay2. It also discusses using persistent storage for containers through creating named Docker volumes stored on NFS, BTRFS, or Gluster file systems. This allows stateful applications to have their data persisted even if containers are removed.

1. Storage-y things
Brian
Goff
Core Engineer @cpuguy83

2. Container & Image Storage
Agenda
Persistent Storage

3. Image &
Container
Storage

4. What storage driver
should I choose?

5. What driver should I choose?
• AUFS
• BTRFS
• DeviceMapper
• Overlay
• Overlay2 (new in 1.12!!!)
• ZFS
Container & Image Storage

6. Persistent
Storage

7. “Docker is for stateless
applications!”— Uninformed

8. How do I do X
with Docker?

9. Docker does not change
computing fundamentals

12. Storage is hard!

13. Share state by
communicating

14. We never lot anyone’s data – but we
had some data take some very, very
long vacations — Bryan Cantrill

15. Create a volume
$ docker volume create --name important_data
important_data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres
$ docker rm –f pgdb
$ # Oh no! I removed my database!... But I didn’t lose my data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres

16. Create a volume - NFS
$ docker volume create --name important_data --opt type=nfs --opt device=1.2.3.4:/export/path
important_data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres
$ docker rm –f pgdb
$ # Oh no! I removed my database!... But I didn’t lose my data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres

17. Create a volume - BTRFS
$ docker volume create --name important_data --opt type=btrfs --opt device=/dev/sdb
important_data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres
$ docker rm –f pgdb
$ # Oh no! I removed my database!... But I didn’t lose my data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres

18. Create a volume - Gluster
$ docker volume create --name important_data --driver glusterfs
important_data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres
$ docker rm –f pgdb
$ # Oh no! I removed my database!... But I didn’t lose my data
$ docker run –d –v important_data:/var/lib/postgresql/data –-name pgdb postgres

19. Storage-y things
Brian
Goff
Core Engineer @cpuguy83