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    Xscontainer

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

      Can you check the presence of the key inside your VM?

      kiuK 1 Reply Last reply Reply Quote 0
      • kiuK Offline
        kiu @olivierlambert
        last edited by olivierlambert

        @olivierlambert yes 🙂

        Output to docker machine :

        [XXXX@docker ~]$ cat .ssh/authorized_keys 
        ssh-rsa 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 root@xcp-ng-XXX
        [XXXX@docker ~]$ 
        

        Output to XCP machine :

        [07:53 xcp-ng-XXXX ~]# cat .ssh/known_hosts 
        192.XXX.XXX.XXX ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNJxGOt3RvDXvelRUPTYyIHmykXhfRWSEN6PXSKYUVxct8qjENHqqqAEJOrl6E5cF9orOGQfbAPjSlLwNqGUGlo=
        [07:55 xcp-ng-XXX ~]#
        
        BenjiReisB 1 Reply Last reply Reply Quote 0
        • stormiS Offline
          stormi Vates 🪐 XCP-ng Team
          last edited by

          One or more added -v to ssh might tell why the keys are not accepted.

          1 Reply Last reply Reply Quote 0
          • BenjiReisB Offline
            BenjiReis Vates 🪐 XCP-ng Team @kiu
            last edited by

            @kiu I reproduced your issue.

            The issue comes from a lib used by xscontainer as a SSH Client which use a deprecated algo ssh-rsa so all modern (>=8.7) OpenSSH reject the connexion.

            BenjiReisB 1 Reply Last reply Reply Quote 1
            • BenjiReisB Offline
              BenjiReis Vates 🪐 XCP-ng Team @BenjiReis
              last edited by

              @BenjiReis following: I tested on a Centos7 VM with an older openssh and the prepare VM script was successful.

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

                So, we found the reason: xscontainer in XCP-ng currently uses a rather old version of python2-paramiko, which seems to insist on using ssh-rsa algorithms, support for which was dropped in recent openssh releases.

                That's why it works for some distros and not for others.

                We'll see it to update the components. Meanwhile, it's possible to fix it by installing python2-pip from EPEL and then upgrading first to "cryptography < 2.6" and then to "paramiko < 3". However, doing this as root may overwrite the files from the RPMs so it's not really clean. I'd advise it only for testing.

                kiuK 2 Replies Last reply Reply Quote 3
                • kiuK Offline
                  kiu @stormi
                  last edited by

                  @stormi OK, thanks. I will try your solution on a small lab.

                  1 Reply Last reply Reply Quote 0
                  • kiuK Offline
                    kiu @stormi
                    last edited by

                    @stormi I tried to do it but I don't think I succeeded. Could you send me a more specific doc of what you are doing?

                    thanks 🙂

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

                      UPDATE 2024-03-19: DON'T DO THIS. We won't support any XCP-ng hosts where system packages have been overriden with pip.

                      I think these are the steps that worked for me:

                      yum install xscontainer
                      yum install python2-pip --enablerepo=epel
                      pip2 install --upgrade "pip < 21"
                      pip2 install --upgrade "cryptography == 2.5"
                      pip2 install --upgrade "paramiko < 3"
                      

                      As this is done outside a virtualenv (I've tried inside a virtualenv, but I think xscontainer runs stuff outside of it, so it didn't work), this will overwrite the contents of RPMs you installed, so, again, only for testing.

                      I also had to remove the former host key from the VM metadata:

                       xe vm-param-remove uuid=... param-name=other-config param-key=xscontainer-sshhostkey
                      
                      kiuK 1 Reply Last reply Reply Quote 1
                      • kiuK Offline
                        kiu @stormi
                        last edited by

                        @stormi Thanks, I just tried that and it still doesn't work 😞

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

                          Well, I tried it myself on a freshly installed pool, and this worked. Can you elaborate on what doesn't work?

                          kiuK 1 Reply Last reply Reply Quote 0
                          • kiuK Offline
                            kiu @stormi
                            last edited by

                            @stormi I still have the same problem, the key does not want to install and asks me if I want to try again.

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

                              What's the exact error message?

                              kiuK 1 Reply Last reply Reply Quote 0
                              • kiuK Offline
                                kiu @stormi
                                last edited by olivierlambert

                                @stormi

                                Would you like to push a pool-specific public SSH key into the ~/.ssh/authorized_keys file of the specified VM and therefore authorize hosts in the pool to interact with the containers inside the VM?
                                Answer y/n: 
                                y
                                Attempting to push the public xscontainer key to USER@IP.
                                ID@IP's password: 
                                Success.
                                Attempting to refresh the state of the VM
                                Failure diagnosis: Unable to find ncat inside the VM. Please install ncat. 
                                Do you wish to retry?
                                Answer y/n:
                                
                                kiuK 1 Reply Last reply Reply Quote 0
                                • kiuK Offline
                                  kiu @kiu
                                  last edited by

                                  My server is up to date

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

                                    It's not the same error. Your VM is missing a required package : ncat, as the error message says.

                                    kiuK 1 Reply Last reply Reply Quote 0
                                    • kiuK Offline
                                      kiu @stormi
                                      last edited by

                                      @stormi My bad. Ok I installed the nmap-ncat package under rockylinux and works perfectly now 🙂 Thank you 🙂

                                      1 Reply Last reply Reply Quote 1
                                      • F foxy82 referenced this topic on
                                      • FinallfF Offline
                                        Finallf
                                        last edited by

                                        @olivierlambert @stormi
                                        Is there any solution for this, I'm researching how to use xcp-ng + XO to build and manage docker.
                                        When I read about Xscontainer I was excited because it seemed like the best option.
                                        I have a small server and would like to know what would be a clean and transparent solution to achieve this.

                                        I've read a lot and I'm still confused.

                                        Below is everything I researched and read on the subject:
                                        https://xcp-ng.org/forum/topic/3232/docker-on-xcp-ng?page=1
                                        https://xcp-ng.org/blog/2021/09/14/runx-next-generation-secured-containers/
                                        https://www.youtube.com/watch?v=qOZk8xpIRpQ
                                        http://oinformata.eti.br/wp/xcp-ng-8-0-debian10-docker/
                                        https://doc.rmbinformatica.com.br/ajuda/redes-e-infraestrutura/xen-server/configurando-o-xenserver-para-monitoramento-de-containers-docker

                                        1 Reply Last reply Reply Quote 0
                                        • codycryptoC Offline
                                          codycrypto
                                          last edited by

                                          I found another workaround (one-step solution) for the "Unable to verify key-based authentication error" without having to mess with any of the python packaging.

                                          Adding

                                          PubkeyAcceptedKeyTypes +ssh-rsa
                                          

                                          To your /etc/ssh/sshd_config file will make the VM accept the older authentication

                                          J 1 Reply Last reply Reply Quote 1
                                          • J Offline
                                            johnnyorange @codycrypto
                                            last edited by

                                            @codycrypto this worked! thank you so much!

                                            codycryptoC 1 Reply Last reply Reply Quote 0
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