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Discover a server

To discover a server:

  1. Generate the user-data configuration for cloud-init. For details, see decapod_generate_user_data.

    The cloud-init execution generates the content of /etc/rc.local. The first and next reboots will call the Decapod API for server registering. Such registration is an idempotent operation. The execution of the Decapod API (POST /v1/server) creates a task for the controller server on facts discovery. The controller executes this task and collects facts from the remote host. A new server model is created or the information on the existing one is updated.

  2. With this configuration, deploy an operating system on a Ceph node. For an example of such deployment, see: decapod_deploy_ceph_node_os, official cloud-init documentation, or use kernel parameters.

As a result, the server should be listed in Decapod. The server discovery takes time because of cloud-init. Therefore, the server may appear in five minutes after deployment. Once the server appears in Decapod, the tool can use it.

Ceph cluster deployed by Decapod in MCP Reference Architecture