44 lines
2.0 KiB
Markdown
44 lines
2.0 KiB
Markdown
---
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layout: "docs"
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page_title: "Frequently Asked Questions"
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sidebar_current: "docs-faq"
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description: |-
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Frequently asked questions and answers for Nomad
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---
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# Frequently Asked Questions
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## Q: What is Checkpoint? / Does Nomad call home?
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Nomad makes use of a HashiCorp service called [Checkpoint](https://checkpoint.hashicorp.com)
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which is used to check for updates and critical security bulletins.
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Only anonymous information, which cannot be used to identify the user or host, is
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sent to Checkpoint. An anonymous ID is sent which helps de-duplicate warning messages.
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This anonymous ID can can be disabled. Using the Checkpoint service is optional and can be disabled.
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See [`disable_anonymous_signature`](/docs/agent/configuration/index.html#disable_anonymous_signature)
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and [`disable_update_check`](/docs/agent/configuration/index.html#disable_update_check).
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## Q: Is Nomad eventually or strongly consistent?
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Nomad makes use of both a [consensus protocol](/docs/internals/consensus.html) and
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a [gossip protocol](/docs/internals/gossip.html). The consensus protocol is strongly
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consistent, and is used for all state replication and scheduling. The gossip protocol
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is used to manage the addresses of servers for automatic clustering and multi-region
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federation. This means all data that is managed by Nomad is strongly consistent.
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## Q: Is Nomad's `datacenter` parameter the same as Consul's?
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No. For those familiar with Consul, [Consul's notion of a
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datacenter][consul_dc] is more equivalent to a [Nomad region][nomad_region].
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Nomad supports grouping nodes into multiple datacenters, which should reflect
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nodes being colocated, while being managed by a single set of Nomad servers.
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Consul on the other hand does not have this two-tier approach to servers and
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agents and instead [relies on federation to create larger logical
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clusters][consul_fed].
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[consul_dc]: https://www.consul.io/docs/agent/options.html#_datacenter
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[consul_fed]: https://www.consul.io/docs/guides/datacenters.html
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[nomad_region]: /docs/agent/configuration/index.html#datacenter
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