Multi datacenter Nomad & Consul

[dma...@istreamplanet.com]

Hi, folks I'm trying to wrap my head around datacenters as applied to consul & nomad in a multi-datacenter scenario.

I want to create a HA nomad cluster in AWS that spans three availability zones in one region.  Should I set that up as three datacenters or one datacenter?  Maybe consul should be set up as a single datacenter while nomad is configured as a single large datacenter?  I want to minimize cross-zone traffic without undermining HA.

Thanks!

-Dylan

[dma...@istreamplanet.com]

Er, by "while nomad is configured as a single large datacenter" I meant to say "three separate datacenters".  Got my brain backwards.

[Chelsea Komlo]

Hi Dylan,

Thanks for the question.

See https://www.nomadproject.io/docs/agent/configuration/index.html#region for more information about Nomad regions, and here for information about network requirements for a Nomad cluster: https://www.nomadproject.io/guides/cluster/requirements.html#network-topology.

See here https://www.consul.io/docs/guides/datacenters.html and https://www.consul.io/docs/guides/areas.html for more information about running Consul across multiple datacenters. As noted here, a single EC2 region can be considered part of a single datacenter due to the networking environment (low latency/high bandwidth): https://www.consul.io/docs/internals/architecture.html

Thanks, let us know if you have any further questions.

Chelsea

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