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    Accedentally set up a pool on an xcp-ng server

    Scheduled Pinned Locked Moved Xen Orchestra
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    • olivierlambertO Online
      olivierlambert Vates 🪐 Co-Founder CEO
      last edited by

      As Danp said, there's always a pool. A "lone host" doesn't exist.

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      • J Offline
        jensolsson.se
        last edited by

        OK, makes total sense, I think what confuses me is actually in XCP-ng center where it seem like an extra subtree for the server I installed. to me it seems something is very different with that host.
        Please see the screenshot. Why is it xcp-ng-3 -> xcp-ng-3 -> XOA
        Whereas I have for example xcp-ng-1 -> XOA and xcp-ng-2 -> XOA ?

        Kind regards
        Jens

        34402832-3074-4bdc-9604-d986402f8a6f-image.png

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        • olivierlambertO Online
          olivierlambert Vates 🪐 Co-Founder CEO
          last edited by

          That's exactly the problem of XCP-ng Center: it's confusing. That's also the reason we really want people to dump it 😉 (see https://xcp-ng.org/docs/management.html it's only community maintained)

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          • J Offline
            jensolsson.se @olivierlambert
            last edited by

            olivierlambert OK oliver, I pretty much only use XO. But it happens that I log on using XCP-ng Center from time to time, mainly if I want to see if there is some feature that is not in XO.

            So you are saying I can pretty much ignore this unusual look of my xcp-ng-3 server?

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            • olivierlambertO Online
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              It's fine. The only confusing thing is coming from XCP-ng Center. You can rename the pool if you like (regardless where, could be done in XCP-ng Center or XO, or even xe).

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              • C Offline
                churchers @olivierlambert
                last edited by

                olivierlambert
                Oh no, I really like it coming from XEN.
                it should always be there....

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                • J Offline
                  jensolsson.se
                  last edited by

                  Thanks for clarifying

                  Jens

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                  • D Offline
                    DannieRothmann
                    last edited by

                    Just for absolute clarification:

                    • When a server is added in XCP-ng Center or Citrix XenCenter, it IS stand alone, we have many of these in production - not a problem.
                    • You have to create a pool or add it to an existing pool, to make it a member, so the xcp-.ng-3 is no longer a stand alone server, it is the master of a pool called xcp-ng-3 - not a problem.
                    • To remove it from the pool again - BIG problem, because you can not remove the master from a pool. You can destroy the pool by "hacking" and you will loose all VM's on local storage ! - BAD IDEA
                    • Leaving it as is looks a little strange, but has absolutely NO impact on the servers functionallity or reliabillity.
                    • So either "backup VM, reinstall server, do not create a pool and restore vm" OR Just live with it as is 🙂
                    stormiS 1 Reply Last reply Reply Quote 0
                    • stormiS Offline
                      stormi Vates 🪐 XCP-ng Team @DannieRothmann
                      last edited by stormi

                      DannieRothmann This is not entirely accurate. As we said earlier, any host, right from the start, is always included in a pool of its own. Just run xe pool-list on it and you'll see. But XCP-ng Center apparently hides this fact so that you'd see it as a standalone host, unless you tell it "I want a pool".

                      You could check in XO, which reflects the exact state of things in the XAPI database: any host belongs to a pool. Always.

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                      • D Offline
                        DannieRothmann @stormi
                        last edited by

                        stormi
                        Ok, I stand corrected, but then its not only a XCP/Xencenter issue. xsconsole also clearly differentiates between being member of a pool or not ? I know that there is always a "master", but either of a stand alone server or of a pool.

                        I actually think that this is one of these situations that totally frustrates a trainer, where what the trainer see in all official training materials (Citrix) and what you actually see in the source code.

                        stormi you know the code far better than me, so when you say it 🙂

                        • I will rephrase:
                          Even though it looks like there is a difference in both XCP/Xencenter and xsconsole, there is actually no difference in the actual system behind the interfaces.
                        • As long as you work with XCP/XS consoles, my previous comment is what you see and experience when using these unsupported tools !
                        • If you use the servers for production, there is only ONE tool you can rely on .... Xen Orchestra .... (and the support is outstanding)
                        stormiS 1 Reply Last reply Reply Quote 1
                        • stormiS Offline
                          stormi Vates 🪐 XCP-ng Team @DannieRothmann
                          last edited by

                          DannieRothmann About xsconsole (which is supported), where do you see a difference between "in a pool" and "not in a pool"?

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                          • D Offline
                            DannieRothmann @stormi
                            last edited by

                            stormi
                            Standalone:
                            NoPool.PNG

                            Single server (New pool created):
                            OneServerInPool.PNG

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                            • stormiS Offline
                              stormi Vates 🪐 XCP-ng Team
                              last edited by

                              Thanks. So there must be a difference somewhere in database or on the host itself. I suspect the only goal behind this was to make believe the host isn't in a pool in order to not confuse users who'd expect that no pool exists when there's only one host... And the result is it's still confusing because now we can have two different setups that are completely identical except that one claims there's no pool and the other says there is 🙂

                              I suppose /etc/xensource/pool.conf contains master in both cases? That's what I see here.

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                              • D Offline
                                DannieRothmann @stormi
                                last edited by

                                stormi

                                I agree, confusing.

                                • Would be easier the Starwars way:
                                  "Always two, there are. No more. No less. A Master and a pool"

                                🙂

                                olivierlambertO 1 Reply Last reply Reply Quote 1
                                • olivierlambertO Online
                                  olivierlambert Vates 🪐 Co-Founder CEO
                                  last edited by

                                  There's no diff. It's just that if you pool doesn't have a namelabel, XenCenter and xsconsole will detect that and tell you it's not in a pool. It's just a plain lie.

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                                  • olivierlambertO Online
                                    olivierlambert Vates 🪐 Co-Founder CEO @DannieRothmann
                                    last edited by

                                    DannieRothmann

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                                    • J Offline
                                      jensolsson.se @olivierlambert
                                      last edited by

                                      olivierlambert Interesting is it possible to simply remove the namelabel. I know it does not matter but I think it is nice to do the same on all hosts

                                      stormiS 1 Reply Last reply Reply Quote 0
                                      • stormiS Offline
                                        stormi Vates 🪐 XCP-ng Team @jensolsson.se
                                        last edited by

                                        @jensolsson-se I'd try with xe pool-param-set [...]. Find the appropriate param name with xe pool-param-list. Disclaimer: I did not check if it's possible.

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                                        • J Offline
                                          jensolsson.se @stormi
                                          last edited by

                                          stormi Thanks, it was easily solved and now there is no extra step in XCP-ng center

                                          [16:57 xcp-ng-btdjnqqd ~]# xe pool-list
                                          uuid ( RO)                : 1f12bb2e-3138-36fd-bfc7-a572186271cf
                                                    name-label ( RW): xcp-ng-3
                                              name-description ( RW): 
                                                        master ( RO): 08a4a440-3c00-4d5e-af8c-46dd412a32cc
                                                    default-SR ( RW): e5b243b2-28ba-31e8-6c8c-c0ab5e9d1c23
                                          
                                          
                                          [16:57 xcp-ng-btdjnqqd ~]# xe pool-param-set
                                          Required parameter not found: uuid
                                          For usage run: 'xe help'
                                          [16:58 xcp-ng-btdjnqqd ~]# xe pool-param-set uuid=1f12bb2e-3138-36fd-bfc7-a572186271cf name-label=
                                          [16:58 xcp-ng-btdjnqqd ~]# xe pool-list
                                          uuid ( RO)                : 1f12bb2e-3138-36fd-bfc7-a572186271cf
                                                    name-label ( RW): 
                                              name-description ( RW): 
                                                        master ( RO): 08a4a440-3c00-4d5e-af8c-46dd412a32cc
                                                    default-SR ( RW): e5b243b2-28ba-31e8-6c8c-c0ab5e9d1c23
                                          
                                          
                                          [16:58 xcp-ng-btdjnqqd ~]# 
                                          
                                          

                                          I wonder why it has named itself xcp-ng-btdjnqqd when I set its name to xcp-ng-3. Everything in XCP-ng center and in XO sais xcp-ng-3 but not in the command prompt.

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                                          • D Offline
                                            DannieRothmann @jensolsson.se
                                            last edited by

                                            @jensolsson-se said in Accedentally set up a pool on an xcp-ng server:

                                            xcp-ng-btdjnqqd

                                            Is seems like the "name" xcp-ng-btdjnqqd is the autogenerated name suggested during installation.

                                            This becomes the "name" of the server, but there is also a "name-label", which is what you see in most places of both the XCP-ng center and XO.

                                            If you look in xsconsole, you will most likely see this "name" i the top right corner of the screen.

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