38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
---
|
|
layout: "docs"
|
|
page_title: "Frequently Asked Questions"
|
|
sidebar_current: "docs-faq"
|
|
description: |-
|
|
Frequently asked questions and answers for Nomad
|
|
---
|
|
|
|
# Frequently Asked Questions
|
|
|
|
## Q: What is Checkpoint? / Does Nomad call home?
|
|
|
|
Nomad makes use of a HashiCorp service called [Checkpoint](https://checkpoint.hashicorp.com)
|
|
which is used to check for updates and critical security bulletins.
|
|
Only anonymous information, which cannot be used to identify the user or host, is
|
|
sent to Checkpoint. An anonymous ID is sent which helps de-duplicate warning messages.
|
|
This anonymous ID can can be disabled. Using the Checkpoint service is optional and can be disabled.
|
|
|
|
See [`disable_anonymous_signature`](/docs/agent/config.html#disable_anonymous_signature)
|
|
and [`disable_update_check`](/docs/agent/config.html#disable_update_check).
|
|
|
|
## Q: How does Atlas integration work?
|
|
|
|
Nomad makes use of a HashiCorp service called [SCADA](http://scada.hashicorp.com)
|
|
(Supervisory Control And Data Acquisition). The SCADA system allows clients to maintain
|
|
long-running connections to Atlas. Atlas can in turn provide auto-join facilities for
|
|
Nomad agents (supervisory control) and an dashboard showing the state of the system (data acquisition).
|
|
|
|
Using the SCADA service is optional. SCADA is only enabled by opt-in.
|
|
|
|
## Q: Is Nomad eventually or strongly consistent?
|
|
|
|
Nomad makes use of both a [consensus protocol](/docs/internals/consensus.html) and
|
|
a [gossip protocol](/docs/internals/gossip.html). The consensus protocol is strongly
|
|
consistent, and is used for all state replication and scheduling. The gossip protocol
|
|
is used to manage the addresses of servers for automatic clustering and multi-region
|
|
federation. This means all data that is managed by Nomad is strongly consistent.
|