[Starlingx-discuss] Adding hosts (Bare Metal AIO Duplex)

[Waines, Greg]

Hey Alex,


  *   For question 1

     *   your understanding of the "host-update" use case is correct
i.e.
        *   power on host which dhcp's on mgmt. network
           *   host gets auto discovered by controller-0 and auto-provisioned without personality
        *   user uses host-update to set personality
           *   controller-0 installs software for that personality

     *   "host-add" use case is sort of the opposite ... configure host first, then power it on
i.e.
        *   user uses "host-add" command and configures host in system's inventory with
identifying information such as BMC IP Address, mgmt. network MAC, etc.,
and the host's personality
        *   user uses "host-power-on" command to power on the host via the BMC
           *   host powers on, dhcp's on mgmt. network
           *   gets recognized by controller-0 from previously configured host info (e.g. mgmt. MAC, ...)
           *   controller-0 installs software for the previously configured personality of this host.

  *   For question 2
     *   pretty sure answer is no
     *   I believe starlingx sysinv/mtce/swmgmt software will always want to install software on a new host
     *
     *   ... although, thinking of question 1,
you could try doing a host-add with the identifying information of controller-1, and power on controller-1 and
see if controller-0 will try to re-install or not
        *   no matter what there will be software versioning checks that happen at boot time to ensure controller-1 is
running the same software as controller-0 and is patch current based on controller-0's applied patches
     *
     *   ... however, why do  you want to do this ?
        *   like is this a real use case ?

Greg.

From: Williams, Alexander <Alexander.Williams at commscope.com>
Sent: Monday, June 7, 2021 12:23 PM
To: starlingx-discuss at lists.starlingx.io
Subject: [Starlingx-discuss] Adding hosts (Bare Metal AIO Duplex)

[Please note: This e-mail is from an EXTERNAL e-mail address]
Hi all,

My current understanding is that whenever adding a host (esp. controller-1) using the system host-update command after a PXE boot, StarlingX will install the base image and then perform the configuration steps to make it a controller, worker, etc., overwriting anything that was previously installed on the machine.

  1.  Is my understanding of host-update correct, or am I missing something important here? Does host-add do the same thing, but gets run on controller-0 before booting and not after?
  2.  If I install the StarlingX image on a server that will become controller-1, is there any way to add it to the host list of controller-0 and configure its personality without the server reinstalling StarlingX?

Best,
Alex
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