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    blktap module needed for kernel 4.16. kernel 4.16 needed for latest Ceph with bluestore backend.

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

      We don't have the resources (nor enough community dev) to be able to get CentOS 7 "transformed" into a XCP-ng in short term. There is a lot of patches to apply on top of CentOS various packages.

      So we'll focus first on a transparent/automated/testable build of XCP-ng from XS, then with this experience/know-how, we'll explore the "from pure CentOS" option.

      We need to prioritize due to our size!

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      • R Offline
        r1 XCP-ng Team
        last edited by

        Sure. Its not a need as well. I know Citrix tried it years ago but probably left for same reason.

        I'll continue to work on DKMS.

        Cheers. Enjoy the Sunday!

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

          You too!

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          • R Offline
            r1 XCP-ng Team
            last edited by

            Update -

            1. Success in running kernel-4.16+ in dom0 with blktap2 driver + Ceph luminous version with bluestore backend.
            2. Could isolate blktap2 driver from kernel to a loadable kernel module in form of blktap2-4.16.8-modules-1.0-1.x86_64.rpm
            3. Can install any upstream kernel in dom0 but blktap2 needs to be built against same kernel else xapi won't start.

            [root@client ~]# uname -a Linux client.enlight 4.16.13 #1 SMP Wed May 30 09:22:58 GMT 2018 x86_64 x86_64 x86_64 GNU/Linux

            [root@client ~]# rpm -ivh blktap2-4.16.8-modules-1.0-1.x86_64.rpm
            error: Failed dependencies: kernel-uname-r = 4.16.8 is needed by blktap2-4.16.8-modules-1.0-1.x86_64

            So essentially to make it worth - the only option is to setup a continous build system that will build latest stable kernels and host either full upstream dom0 compatible kernel or just the blktap2 module... may be both 🙂

            Time to rest blktap2 and move to the actual Ceph productivity integrations.

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

              We want to make this CI stuff, that we will be the goal of Sam, our new recruit coming in 20 days!

              edit: @r1 you are obviously more than welcome aboard to help us on that!

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              • R Offline
                r1 XCP-ng Team
                last edited by

                @olivierlambert Would you want to include this in that CI? May be on an experimental branch.

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

                  I don't know yet, it's likely we'll have multiple CI, one for "stable", one for "experimental" with a lot of fun stuff inside 🙂

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                  • R Offline
                    r1 XCP-ng Team
                    last edited by

                    Cool 😄

                    I'll get the patch added to GitHub for open access till then.

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                    • R Offline
                      r1 XCP-ng Team
                      last edited by r1

                      I added the patch on Github - I'm testing it in various systems.

                      If you are using RBDSR then use the extra flag device-config:rbd-mode=kernel while creating the PBD.

                      Cheers.

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

                        Thanks!

                        Is there a way to get this upstream?

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                        • R Offline
                          r1 XCP-ng Team
                          last edited by

                          I don't know yet.
                          I will try for centos-release-xen as its a SIG and maintains Xen specific dom0 kernel.

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

                            The CentOS packaging of Xen is very different from XenServer/XCP-ng. "Upstream" for me meant XenServer, no CentOS (at least for a bit)

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                            • M Offline
                              maxcuttins
                              last edited by

                              @r1 Sorry Rushy,

                              Why did you create a patch instead of directly sent a pull request to the original blktap2 driver.
                              I'll say it's time to stop to make unofficial patches which can be overwritten by upstream updates.
                              Let's change the upstream directly.

                              https://github.com/xapi-project/blktap

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                              • R Offline
                                r1 XCP-ng Team
                                last edited by

                                @maxcuttins There are two packages. User level blktap driver that you referred blktap and a builtin kernel driver blktap2. Said patch is against mainline kernel as additional driver.

                                You still need to have user land blktap from https://github.com/xapi-project/blktap
                                There are instructions lying around https://xcp-ng.org/forum/topic/122/how-to-build-blktap-from-sources/ to build user land blktap (its without patch).

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