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CONTAINERS AND DATA PERSISTENCECLINT KITSON – DEVELOPER ADVOCATE - @CLINTONSKITSON

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A TYPICAL MICROS-SERVICE

APPLICATION ARCHITECTURE

Low Latency Please

Load Balancing

Routing

Services

Persistence

Non-Persistence

VM Cloud

12-Factor AppWithout Persistence

Persistence is Evolving

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PERSISTENCE IS EVOLVING

VM CONTAINERCLOUD

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“LIBRARY” CONTAINERS W/ DATA??

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A DATABASE IS AN APP

- EASY FOR DEV & TEST- STORAGE IS ORCHESTRATED OUTSIDE OF CONTAINER ENGINE- TYPICALLY AN OPS ASSISTED WORKFLOW- DOCKER EXTENSIONS WILL HELP CREATED HOOKS FOR EXTENSIBILITY

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TODAYS APPROACH TO PERSISTENCE

CONTAINER OS

CONTAINER CONTAINER with MOUNT

/var/lib/docker/graphdriver/.. /mnt/PersistentData

- MOUNT A DIRECTORY TO A CONTAINER

- TYPICAL ECO-SYSTEM APPROACH

Block/NAS

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BUT..- CAN A CONTAINER LIVE ON PERSISTENT STORAGE AND/OR INCLUDE A MOUNT- CAN WE DEFINE A STORAGE POLICY WITH A CONTAINER- CAN WE DIFFERENTIATE STORAGE SERVICE AT A CONTAINER LEVEL

..HENCE, CAN CONTAINER ENGINE TO INDEPENDENTLY MANAGE STORAGE

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DOGGED & REXRAY

Block, NAS

CoreOS, Atomic, Photon

vCloud,OpenStack,

EC2, vSphere,KVM,

Xen, Physical

Storage

Docker, Rocket, Garden, Photon

Kubernetes, Mesos, Swarm

Agnostic of the stack

1) Apply Storage Policies to Containers

2) Provide Container level Data Services

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PROJECT MUTT CUTTS

Container Storage Requirements Embedded in Container Manifestor Requested with Container or Container Volume creation

Container Engine uses Storage Driver to Create/Map/Mount Storage from Rexray for Persistent use cases

DVOL

github.com/emccode/dogged

Container Engine determines underlying storage capabilities from Hypervisor/SDS

github.com/emccode/rexray

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VIDEO – DOGGED+DOCKER

- CONTAINER DATA VOLUME MANAGEMENT- DATA VOLUME STORAGE POLICY- DATA VOLUME SNAPSHOTS- DATA VOLUME REPLICATION