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    • stormi
      stormi Vates 🪐 XCP-ng Team 🚀 last edited by stormi

      xscontainer is indeed not supported anymore by XenServer since version 8.2, but we still provide it "as-is", as long as it proves useful and works.

      xscontainer-prepare-vm is a rather simple python script, so if needed one could add traces to it or use pdb to debug issues.

      Anyway, here it looks like key-based authentication failed after attempting (with apparent success) to add the SSH key to the user's authorized_keys, so I would first troubleshoot this with ssh.

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

        @stormi Hello, I don't really see how to solve the ssh problem or even solve the problem with python.

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

          If I understand correctly:

          • your root user in XCP-ng has a SSH key that was generated by the script
          • this key was added to the authorized_keys file for your user in the VM
          • this should allow root on XCP-ng to login with ssh without a password, but this doesn't

          So: try to login with ssh, without password, outside the script. Add one or more -v switches to SSH. Check the web for similar issues.

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

            @stormi Hi, I just tested and it still doesn't work 😕

            1 Reply Last reply Reply Quote 0
            • olivierlambert
              olivierlambert Vates 🪐 Co-Founder🦸 CEO 🧑‍💼 last edited by

              Can you be more specific?

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

                @olivierlambert I still have the same problem, even adding the ssh keys before running xscontainer.

                1 Reply Last reply Reply Quote 0
                • olivierlambert
                  olivierlambert Vates 🪐 Co-Founder🦸 CEO 🧑‍💼 last edited by

                  Have you followed the details given by @stormi ? You should have some detailed output then

                  kiu 2 Replies Last reply Reply Quote 0
                  • kiu
                    kiu @olivierlambert last edited by

                    @olivierlambert I have this output :

                    [13:24 xcp-ng-XXXX ~]# ssh -v XXX@XXXXXXXXX
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to XXXXXXXX [XXXXXXXX] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.7
debug1: match: OpenSSH_8.7 pat OpenSSH* compat 0x04000000
debug1: Authenticating to XXXXXXXXX:22 as 'XXXXXXXX'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: curve25519-sha256 need=32 dh_need=32
debug1: kex: curve25519-sha256 need=32 dh_need=32
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:bmXWosoos6FqfYJXXYPv1H5lU4fRKIucvEv1QE/chN0
debug1: Host 'XXXXXXXXXXXX' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:1
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25519@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,webauthn-sk-ecdsa-sha2-nistp256@openssh.com>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)

debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)

debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Trying private key: /root/.ssh/id_ed25519
debug1: Next authentication method: password
XXXXX@XXXXXXXXX's password: 
debug1: Authentication succeeded (password).
Authenticated to XXXXXXXXXXXX ([XXXXXXXXXX]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LANG = fr_FR.UTF-8
Last login: Mon Jan 23 13:23:33 2023
[XXXXX@docker ~]$
                    1 Reply Last reply Reply Quote 0
                    • kiu
                      kiu @olivierlambert last edited by

                      @olivierlambert @stormi up 🙂

                      1 Reply Last reply Reply Quote 0
                      • olivierlambert
                        olivierlambert Vates 🪐 Co-Founder🦸 CEO 🧑‍💼 last edited by

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

                        kiu 1 Reply Last reply Reply Quote 0
                        • kiu
                          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 ~]#
                          BenjiReis 1 Reply Last reply Reply Quote 0
                          • stormi
                            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
                            • BenjiReis
                              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.

                              BenjiReis 1 Reply Last reply Reply Quote 1
                              • BenjiReis
                                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
                                • stormi
                                  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.

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

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

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

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

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

                                          1 Reply Last reply Reply Quote 0
                                          • stormi
                                            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?

                                            kiu 1 Reply Last reply Reply Quote 0
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