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The Future of Cloud Software Defined
Storage withCeph
2
Andrew Hatfield
Practice Lead – Cloud Storage and Big Data (ANZ)
Red Hat
andrew.hatfield@redhat.com
@andrewhatfield
/usr/bin/whoami
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Overview
● What is Ceph
● Integration with OpenStack
– Stuff you already know is cool
● New stuff coming
– Even more cool stuff!
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What is Ceph
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PROPRIETARY HARDWARE
PROPRIETARY SOFTWARE
SUPPORT & MAINTENANCE
COMPUTER DISK
COMPUTER DISK
COMPUTER DISK
STANDARDHARDWARE
OPEN SOURCE SOFTWARE
ENTERPRISEPRODUCTS & SERVICES
COMPUTER DISK
COMPUTER DISK
COMPUTER DISK
A Storage Revolution
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CEPH COMPONENTS
RGWweb services gateway
for object storage, compatible with S3 and
Swift
LIBRADOSclient library allowing apps to access RADOS (C, C++, Java, Python, Ruby, PHP)
RADOSsoftware-based, reliable, autonomous, distributed object store comprised of
self-healing, self-managing, intelligent storage nodes and lightweight monitors
RBDreliable, fully-distributed block device with cloud
platform integration
CEPHFSdistributed file system with POSIX semantics
and scale-out metadata management
APP HOST/VM CLIENT
RADOS CLUSTER
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APPLICATION
M M
M M
M
RADOS CLUSTER
OBJECT STORAGE DAEMONS
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FS
DISK
OSD
DISK
OSD
FS
DISK
OSD
FS
DISK
OSD
FS
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M
M
RADOS COMPONENTS
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OSDs: 10s to 10,000s in a cluster One per disk (or one per SSD, RAID group…) Serve stored objects to clients Intelligently peer for replication & recovery
Monitors: Maintain cluster membership and state Provide consensus for distributed decision-
making Small, odd number These do not serve stored objects to clients
M
CRUSH: DYNAMIC DATA PLACEMENT
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CRUSH: Pseudo-random placement algorithm
Fast calculation, no lookup Repeatable, deterministic
Statistically uniform distribution Stable mapping
Limited data migration on change Rule-based configuration
Infrastructure topology aware Adjustable replication Weighting
DATA IS ORGANIZED INTO POOLS
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CLUSTER
OBJECTS
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1001
0110 10 01
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POOLS(CONTAINING PGs)
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10 01 10 11
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POOLA
POOLB
POOL C
POOLD
OBJECTS
OBJECTS
OBJECTS
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Integration with OpenStack
THE RADOS GATEWAY
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M M
M
RADOS CLUSTER
RADOSGWLIBRADOS
socket
RADOSGWLIBRADOS
APPLICATION APPLICATION
REST
RADOSGW MAKES RADOS WEBBY
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RADOSGW: REST-based object storage proxy Uses RADOS to store objects API supports buckets, accounts Usage accounting for billing Compatible with S3 and Swift applications
RBD STORES VIRTUAL DISKS
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RADOS BLOCK DEVICE: Storage of disk images in RADOS Decouples VMs from host Images are striped across the cluster (pool) Snapshots Copy-on-write clones Support in:
Mainline Linux Kernel (2.6.39+) Qemu/KVM, native Xen coming soon OpenStack, CloudStack, Nebula, Proxmox
KERNEL MODULE FOR MAX FLEXIBLE!
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M M
RADOS CLUSTER
LINUX HOSTKRBD
STORING VIRTUAL DISKS
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M M
RADOS CLUSTER
HYPERVISORLIBRBD
VM
CEPH AND OPENSTACK
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RADOSGWLIBRADOS
M M
RADOS CLUSTER
OPENSTACKKEYSTONE CINDER GLANCE NOVASWIFT
LIBRBD LIBRBD
HYPER- VISOR
LIBRBD
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What is New()?
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Recent news
● Ceph continues to be the #1 storage choice for Open Stack (April User Survey)
● Ceph is now an openstack.org Reference Architecture (joining LVM & NFS)
● Ceph at Percona Live for MySQL Database-as-a-Service
● CephFS is now stable and ready for testing (Jewel release)
● ceph-ansible deployment in 2 commands
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● OpenStack Manila + CephFS for File-as-a-Service
● BlueStore – Direct to block device, no filesystem
● Active / Active Multi-master RGW for global object stores
● NFS Gateway for RGW (v4 only) for legacy access
● Active Directory support for RGW
● AWS4 Support
● Swift – Keystone v3, Object expiration, tenant namespaces, static large objects
● RBD mirroring
● Client IO prioritised over scrubbing
● Containerised Ceph
Work in Progress
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THANK YOU!
Andrew HatfieldPractice Lead - Cloud Storage and Big Data
andrew.hatfield@redhat.com
@andrewhatfield
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