Determine Which BOS Session Booted a Node

This guide is split into two sections, BOS Version 1 (V1) and BOS Version 2 (V2), because the procedures are different for the two different versions.

BOS Version 1 (V1)

To determine which BOS Session booted or rebooted a node, query the node’s kernel boot parameters. They contain a bos_session_id parameter which identifies which BOS session booted or rebooted the node. Then, use this BOS Session ID to describe the BOS Session, which identifies the BOS Session template used.

Query the node

  1. (ncn-mw#) Set an environment variable to the xname of the node in question.

    For example:

    export NODE_XNAME="x3000c0s19b4n0"

  2. (ncn-mw#) Query the node in question via SSH.

    BOS_SESSION_ID=$(ssh $NODE_XNAME "cat /proc/cmdline" | awk -v RS=" " -F "=" '{if ($1 == "bos_session_id") { print $2; }}')
echo $BOS_SESSION_ID

    The output will be the BOS session ID. For example:

    4b6744ee-837f-4f60-9051-897aed6c7623

Query BOS

  1. (ncn-mw#) Describe this session.

    cray bos v1 session describe ${BOS_SESSION_ID} --format json

    This will output information about the BOS session. For example:

    {
  "complete": false,
  "error_count": 0,
  "in_progress": false,
  "job": "boa-4b6744ee-837f-4f60-9051-897aed6c7623",
  "operation": "reboot",
  "start_time": "2023-06-23T20:57:34.352623Z",
  "status_link": "/v1/session/4b6744ee-837f-4f60-9051-897aed6c7623/status",
  "stop_time": "2023-06-23 21:24:14.647779",
  "templateName": "knn-boot-x3000c0s28b4n0"
}

    The templateName parameter is the name of the BOS session template used to boot or reboot the node.

BOS Version 2 (V2)

Ask BOS V2 to describe the component. The session that last acted upon the node is listed in this description.

Instructions

  1. (ncn-mw#) Set an environment variable to the xname of the node in question.

    For example:

    export NODE_XNAME="x3000c0s17b0n0"

  2. (ncn-mw#) Query the BOS component for that node.

    BOS_SESSION_ID=$(cray bos v2 components describe $NODE_XNAME --format json | jq -r .session)
echo $BOS_SESSION_ID

    The output will be the BOS session ID. For example:

    94e712ab-df76-40ee-8cfb-7ac487fd8a13

  3. (ncn-mw#) Describe the BOS session.

    cray bos v2 sessions describe $BOS_SESSION_ID --format json

    This will output information about the BOS session. For example:

    {
  "components": "x3000c0s17b0n0",
  "limit": "x3000c0s17b0n0",
  "name": "94e712ab-df76-40ee-8cfb-7ac487fd8a13",
  "operation": "reboot",
  "stage": false,
  "status": {
    "end_time": "2023-06-27T00:55:58",
    "error": null,
    "start_time": "2023-06-27T00:33:17",
    "status": "complete"
  },
  "template_name": "gdr-tmpl"
}

    The template_name parameter is the name of the BOS session template used to boot or reboot the node.