Re: Xen died - Fedora upgrade from 21 to 26

Alvin Starr <alvin@xxxxxxxxxx> · Wed, 26 Jul 2017 10:28:25 -0400



    I believe this problem also exists in F25.
    There are upsides to having a vm do the networking and I have
      used that scheme for something like a decade.
    The point is that libvirt should start up and start its VM's
      correctly.
    If you cannot depend on the system starting correctly then very
      quickly you cannot depend on the system at all and then your
      backing out to your switches and network cables and power supplies
      .....
    My guess is that its related to libvirt trying to start before
      the xen subsystems have come up.
    

    On 07/26/2017 09:32 AM, Dominik Psenner
      wrote:

    
      Note that this does not help with the original
        problem but points out a critical design flaw.
        

          To me your it infrastructure design has no
            working disaster recovery plan. You should always be able to
            access critical functionality and from there be able to
            restore complete functionality step by step. In your case
            the outermost functionality is the vm host. You should
            always be able to log into that machine once it has all
            cables plugged in, regardless of what runs on it (or not).
          

          This means that even though you might get this to work you
          should rethink your design so that you do not have to rely on
          the vm that does the networking.

          
            On 26 Jul 2017 12:50 p.m., "G
              Crowe" <gclvirtlist@xxxxxxxxxx>
              wrote:

              Jim,

                    Thanks for that, I had manually installed
                libvirt-daemon-driver-xen, but also needed to install
                libvirt-daemon-driver-libxl. I can now create VMs and
                convert config formats.

                
                However the daemon still fails to start on bootup. It
                starts fine when I manually start it with "systemctl
                start libvirtd" but setting it to autostart with
                "systemctl enable libvirtd" seems to have no effect.
                When I look at the status, it tells me that the service
                is "enabled" which means that it starts on bootup (well,
                that's what it means for any other service).

                
                This is rather critical on this PC, as it has unattended
                restarts and the VPN/routing is done in one of the VMs
                (i.e. I can't get to it unless it auto-starts at least
                one VM).

                
                Unfortunatley there is nothing appearing in the libvirtd
                log over a reboot to help diagnose.

                
                Any suggestions?

                
                Thank you

                
                GC

                
                [root@testhost ~]# systemctl status libvirtd

                ● libvirtd.service - Virtualization daemon

                   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service;
                enabled; vendor preset: enabled)

                   Active: inactive (dead)

                     Docs: man:libvirtd(8)

                           http://libvirt.org
                

                  On 25/07/2017 1:20 AM, Jim Fehlig wrote:

                  
                    On 07/23/2017 04:25 PM, G Crowe wrote:

                    
                      Hi,

                           I am trying to upgrade my Xen host (Dom0) and
                      are having troubles getting it to work.

                      
                      I think that it has booted into a kernel that
                      supports Xen (running 'xl info' does list some Xen
                      capabilities), but I have three problems (that I
                      have found so far).

                      
                      Firstly, the "libvirtd" daemon doesn't start on
                      bootup (and as a result all 'virsh' commands
                      fail). It is set to auto-start (systemctl enable
                      libvirtd), and can be manually started (systemctl
                      start libvirtd), but it will not auto-start on
                      reboot.

                      
                      Secondly, Once I have manually started libvirtd,
                      when I try to define a domain it gives me an error
                      "could not find capabilities for arch=x86_64
                      domaintype=xen" and I haven't yet been able to
                      define any domains. This domain type works fine on
                      Fedora 21.

                      
                      Thirdly, I am unable to convert to/from xml config
                      format, it gives me the error "error: invalid
                      argument: unsupported config type xen-xl" however
                      the format "xen-xl" works fine on the Fedora 21
                      machine.

                    
                    It sounds like the libvirt libxl driver is not
                    loaded. Is the libvirt-daemon-driver-libxl package
                    installed? If it's installed, enabling debug logging
                    in libvirtd can provide hints why it is not loading

                    
                    http://libvirt.org/logging.html

                    
                    Regards,

                    Jim

                    
                      I had these same issues when I tried to upgrade to
                      Fedora 25 and assumed that something had been
                      broken and so abandoned further attempts to
                      upgrade, however since Fedora 26 is the same I am
                      now assuming that I have stuffed something up
                      myself (or missed something).

                      
                      Fedora 21 uses kernel 3.19.3 and xen 4.4.1

                      Fedora 26 uses kernel 4.11.8 and xen 4.8.1

                      
                      I have tried following the info on https://wiki.xen.org/wiki/Fedora_Host_Installation
                      but it appears to be out of date now (I used this
                      site when I started using Xen under Fedora 19, and
                      when I upgraded to Fedora 21)

                      
                      Does anyone have any suggestions? outputs from "xl
                      info" and the domain config are below. I have also
                      tried disabling SELinux, but it made no
                      difference.

                      
                      Thanks

                      
                      GC

                      
                      -----------------------------------------------

                      On the fedora 26 box.....

                      # xl info

                      host                   : family.mydomain.mytld

                      release                : 4.11.8-300.fc26.x86_64

                      version                : #1 SMP Thu Jun 29
                      20:09:48 UTC 2017

                      machine                : x86_64

                      nr_cpus                : 4

                      max_cpu_id             : 3

                      nr_nodes               : 1

                      cores_per_socket       : 4

                      threads_per_core       : 1

                      cpu_mhz                : 2712

                      hw_caps                :
                      b7ebfbff:77faf3bf:2c100800:00000121:0000000f:009c67af:00000000:00000100

                      virt_caps              : hvm hvm_directio

                      total_memory           : 8072

                      free_memory            : 128

                      sharing_freed_memory   : 0

                      sharing_used_memory    : 0

                      outstanding_claims     : 0

                      free_cpus              : 0

                      xen_major              : 4

                      xen_minor              : 8

                      xen_extra              : .1

                      xen_version            : 4.8.1

                      xen_caps               : xen-3.0-x86_64
                      xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p
                      hvm-3.0-x86_64

                      xen_scheduler          : credit

                      xen_pagesize           : 4096

                      platform_params        :
                      virt_start=0xffff800000000000

                      xen_changeset          :

                      xen_commandline        : placeholder

                      cc_compiler            : gcc (GCC) 7.0.1 20170421
                      (Red Hat 7.0.1-0.15)

                      cc_compile_by          : mockbuild

                      cc_compile_domain      : [unknown]

                      cc_compile_date        : Wed May  3 21:23:49 UTC
                      2017

                      build_id               :
                      1c6e5a40165e05837303942b54757ae1f2d5033d

                      xend_config_format     : 4

                      
                      ---------------------------------------------------

                      # cat vmtest.xml

                      <domain type='xen' id='21'>

                         <name>testVM</name>

                         <memory unit='KiB'>2097152</memory>

                         <currentMemory
                      unit='KiB'>2097152</currentMemory>

                         <vcpu placement='static'>1</vcpu>

                         <os>

                           <type arch='x86_64'
                      machine='xenfv'>hvm</type>

                           <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader>

                           <boot dev='network'/>

                         </os>

                         <features>

                           <acpi/>

                           <apic/>

                           <pae/>

                         </features>

                         <clock offset='variable' adjustment='0'
                      basis='utc'/>

                         <on_poweroff>destroy</on_poweroff>

                         <on_reboot>restart</on_reboot>

                         <on_crash>restart</on_crash>

                         <devices>

                           <interface type='bridge'>

                             <mac address='02:02:00:03:00:00'/>

                             <source bridge='enp1s0'/>

                             <script path='vif-bridge'/>

                           </interface>

                           <serial type='pty'>

                             <target port='0'/>

                           </serial>

                           <console type='pty'>

                             <target type='serial' port='0'/>

                           </console>

                           <input type='mouse' bus='ps2'/>

                           <input type='keyboard' bus='ps2'/>

                           <graphics type='vnc' port='5901'
                      autoport='no' listen='192.168.131.54'>

                             <listen type='address'
                      address='192.168.131.54'/>

                           </graphics>

                         </devices>

                      </domain>

                      
                      --------------------------------------

                      
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    -- 
Alvin Starr                   ||   land:  (905)513-7688
Netvel Inc.                   ||   Cell:  (416)806-0133
alvin@xxxxxxxxxx              ||


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