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docs Atlas Integration docs-guides-atlas This guide covers how to integrate Atlas with Consul to provide features like an infrastructure dashboard and automatic cluster joining.

Atlas Integration

Atlas is a service provided by HashiCorp to deploy applications and manage infrastructure. Starting with Consul 0.5, it is possible to integrate Consul with Atlas. This is done by registering a node as part of an Atlas infrastructure (specified with the -atlas flag). Consul maintains a long-running connection to the SCADA service which allows Atlas to retrieve data and control nodes.

Data acquisition allows Atlas to display the state of the Consul cluster in its dashboard and set up alerts based on health checks. Remote control enables Atlas to provide features like auto-joinining nodes.

Enabling Atlas Integration

To enable Atlas integration, you must specify the name of the Atlas infrastructure and the Atlas authentication token. The Atlas infrastructure name can be set either with the -atlas CLI flag, or with the atlas_infrastructure configuration option. The Atlas token is set with the -atlas-token CLI flag, atlas_token configuration option, or ATLAS_TOKEN environment variable.

To verify the integration, either run the agent with debug-level logging or use consul monitor -log-level=debug and look for a line like:

[DEBUG] scada-client: assigned session '406ca55d-1801-f964-2942-45f5f9df3995'

This shows that the Consul agent was successfully able to register with the SCADA service.

Using Auto-Join

Once integrated with Atlas, the auto-join feature can be used to have nodes automatically join other peers in their datacenter. Server nodes will automatically join peer LAN nodes and other WAN nodes. Client nodes will only join other LAN nodes in their datacenter.

Auto-join is enabled with the -atlas-join CLI flag or the atlas_join configuration option.

Securing Atlas

The connection to Atlas does not have elevated privileges. API requests made by Atlas are served in the same way any other HTTP request is handled. If ACLs are enabled, it is possible, via the atlas_acl_token configuration option, to force an Atlas ACL token to be used instead of the agent's default token.

The resolution order for ACL tokens is:

  1. Request-specific token provided by ?token=. These tokens are set in the Atlas UI.
  2. The agent's atlas_acl_token, if configured.
  3. The agent's acl_token, if configured.
  4. The anonymous token.

Because the acl_token typically has elevated permissions compared to the anonymous token, the atlas_acl_token can be set to anonymous to drop privileges that would otherwise be inherited from the agent.