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OpenStack Summit Presentations


"How DreamHost builds a Public Cloud with OpenStack"

By: Carl Perry

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
IPv4.

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
graphite).

Uptime: Decouple everything. Have multiple paths. Maintenance windows
are a thing of the past. HA is no longer an option


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