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Wednesday, October 17 • 11:00am - 11:40am
How DreamHost builds a Public Cloud with OpenStack

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DreamHost is launching several public cloud offerings, and along the way
we have learned a lot of information. The goal of this talk is to share
some of the lessons, tips, and tricks we have learned while designing
public cloud architectures.

Talk Outline and Notes:
The problems: Scale, Speed, Monitoring, Uptime, Security, Cost.
The domains: Networking, Storage, Hypervisors.

Scale: The pervasive problem. There are obvious issues (Data Center
Size, Network Switching Architecture, etc), but there are also the
not-so-obvious problems: DNS zone sizes and rebuild times, ARP/ND table
sizes, growing beyond Ethernet VLANs, and multiplication factor on small
delays. IPv6 is a requirement, not a nice to have, because we're out of

Speed: Disk I/O, Memory I/O, Network I/O, and CPU time all matter.
Performance cannot be cloud washed any longer. Beyond the user focused
problems there are pressing concerns inside the provider as well: how
fast can you expand? Automation is a requirement here that may cause
some initial delays will pay off long term.

Monitoring: Start with simple service monitoring via Nagios, then go
deeper. Agents on every everything. "Graph all the things" (we use

Uptime: Decouple everything. Have multiple paths. Maintenance windows
are a thing of the past. HA is no longer an option, it's a requirement.
DevOps is the start, but planning and testing are critical.

Security: IPv6 is not IPv4 with more addresses; there are solutions to
common problems (ND replaces ARP), and introduction of new ones (RA).
Standard shared hosting/colo security models no longer work. The barrier
to entry in the cloud is a few cents, not a contract and an account
manager. Providers have to be proactive about security: SPAM, traffic
patterns, and bad money.

Cost: Forget everything you know about traditional storage. NFS, iSCSI,
SAN: these all do too little for too much money. Thinks like Ceph and
other Open Source technologies are game changers. Don't jump to the
other end of the pool either: consumer SATA brings a whole different
world of pain (time-outs and retries cause massive and hidden
performance degradation). We're going for the middle of the road:
Enterprise SATA and Enterprise SAS.

We are trying to open a new world in cloud computing: open tech, open
standards, and talking in the open. We think cloud should no longer be a
black box, and we're willing to talk about it on the record.

avatar for Carl Perry

Carl Perry

Cloud Architect, eNovance
Carl a Cloud Architect at eNovance where he designs and helps implement OpenStack based clouds for customers. He's been working with Linux since the days of Slackware 3.0 on a bunch of 3.5" floppies.http://www.linkedin.com/pub/carl-perry/a/380/9a0... Read More →

Wednesday October 17, 2012 11:00am - 11:40am PDT
Manchester A

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