Virtualization Xen Debian Lenny AMD64: "xm create hostname" (error)

Discussion in 'HOWTO-Related Questions' started by computer_freak_8, Oct 29, 2009.

  1. computer_freak_8

    computer_freak_8 New Member

    Hello,
    I'm trying this tutorial, and I got it to work once, so I tried it again, with partial success.

    I successfully created the image (or so it said), but when I tried to start it, I get an error. I'm not sure what's different; below is copy/paste from my SSH terminal (but with my [email protected] changed, and the lines I typed the commands on have been put in bold).
    Code:
    [B][email protected]:~$ sudo xm create /etc/xen/debian-lenny.cfg [/B]
    Using config file "/etc/xen/debian-lenny.cfg".
    Error: Device 51714 (vbd) could not be connected.
    File /home/xen/domains/debian-lenny/disk.img is loopback-mounted through /dev/loop0,
    which is mounted in the privileged domain,
    and so cannot be mounted by a guest.
    [B][email protected]:~$ sudo xm list[/B]
    Name                                        ID   Mem VCPUs      State   Time(s)
    Domain-0                                     0   842     4     r-----    345.5
    [B][email protected]:~$ sudo -s[/B]
    [B][email protected]:~# exit[/B]
    exit
    [B][email protected]:~$ sudo whoami[/B]
    root
    [B][email protected]:~$[/B] sudo xm create /etc/xen/debian-lenny.cfg 
    Using config file "/etc/xen/debian-lenny.cfg".
    Error: Device 51714 (vbd) could not be connected.
    File /home/xen/domains/debian-lenny/disk.img is loopback-mounted through /dev/loop0,
    which is mounted in the privileged domain,
    and so cannot be mounted by a guest.
    [B][email protected]:~$ sudo -s[/B]
    [B][email protected]:~# xm create /etc/xen/debian-lenny.cfg[/B]
    Using config file "/etc/xen/debian-lenny.cfg".
    Error: Device 51714 (vbd) could not be connected.
    File /home/xen/domains/debian-lenny/disk.img is loopback-mounted through /dev/loop0,
    which is mounted in the privileged domain,
    and so cannot be mounted by a guest.
    [B][email protected]:~# exit[/B]
    exit
    [B][email protected]:~$ [/B]
    
     
  2. falko

    falko Super Moderator ISPConfig Developer

    Is it possible that /home/xen/domains/debian-lenny/disk.img is still mounted while you're trying to start the guest? What's the output of
    Code:
    mount
    ?
     
  3. computer_freak_8

    computer_freak_8 New Member

    Edit: The short version is that I got it working now. Thanks! For the full explanation, keep reading...

    Bingo! The question now is, how to unmount it? Hmm...
    Code:
    [B][email protected]:~$ sudo mount -l[/B]
    /dev/sda5 on / type ext3 (rw,errors=remount-ro)
    tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
    proc on /proc type proc (rw,noexec,nosuid,nodev)
    sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
    procbususb on /proc/bus/usb type usbfs (rw)
    udev on /dev type tmpfs (rw,mode=0755)
    tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
    devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
    nfsd on /proc/fs/nfsd type nfsd (rw)
    /home/xen/domains/debian-lenny/disk.img on /tmp/tekA5p8kWS type ext3 (rw,loop=/dev/loop0)
    /proc on /tmp/tekA5p8kWS/proc type none (rw,bind)
    [B][email protected]:~$ sudo umount /home/xen/domains/debian-lenny/disk.img [/B]
    umount: /tmp/tekA5p8kWS: device is busy
    umount: /tmp/tekA5p8kWS: device is busy
    
    Well, this probably isn't the recommended way, but here's what I tried next:
    Code:
    [B][email protected]:~$ ps -A | grep xen[/B]
       31 ?        00:00:00 xenwatch
       32 ?        00:00:00 xenbus
     3208 ?        00:00:00 xenstored
     3215 ?        00:00:00 xenconsoled
    [B][email protected]:~$ sudo kill 3208[/B]
    [B][email protected]:~$ ps -A | grep xen[/B]
       31 ?        00:00:00 xenwatch
       32 ?        00:00:00 xenbus
     3215 ?        00:00:00 xenconsoled
    [B][email protected]:~$ sudo umount /home/xen/domains/debian-lenny/disk.img [/B]
    umount: /tmp/tekA5p8kWS: device is busy
    umount: /tmp/tekA5p8kWS: device is busy
    [B][email protected]:~$ sudo kill 3215[/B]
    [B][email protected]:~$ ps -A | grep xen[/B]
       31 ?        00:00:00 xenwatch
       32 ?        00:00:00 xenbus
    [B][email protected]:~$ sudo umount /home/xen/domains/debian-lenny/disk.img [/B]
    umount: /tmp/tekA5p8kWS: device is busy
    umount: /tmp/tekA5p8kWS: device is busy
    [B][email protected]:~$ sudo /etc/init.d/xend force-reload[/B]
    Restarting XEN control daemon: xend
    
    This made it unresponsive. So, from another terminal:
    Code:
    [B][email protected]:~$ ssh [email protected][/B]
    ssh: connect to host 192.168.5.9 port 22: No route to host
    [B][email protected]:~$ ssh [email protected][/B]
    ssh: connect to host 192.168.5.9 port 22: No route to host
    
    At this point I rebooted the machine (the server). This made the first SSH terminal say:
    Code:
    Read from remote host 192.168.5.9: Connection reset by peer
    Connection to 192.168.5.9 closed.
    
    After it finished booting, I got it working:
    Code:
    [B][email protected]:~$ ssh [email protected][/B]
    [B][email protected]'s password: [/B]
    Linux server 2.6.26-2-xen-amd64 #1 SMP Thu Aug 20 00:36:34 UTC 2009 x86_64
    
    The programs included with the Debian GNU/Linux system are free software;
    the exact distribution terms for each program are described in the
    individual files in /usr/share/doc/*/copyright.
    
    Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
    permitted by applicable law.
    Last login: Thu Oct 29 17:02:40 2009 from machine.domain
    [B][email protected]:~$ sudo xm list[/B]
    [sudo] password for user: 
    Name                                        ID   Mem VCPUs      State   Time(s)
    Domain-0                                     0  1640     4     r-----      8.0
    [B][email protected]:~$ sudo xm create /etc/xen/debian-lenny.cfg [/B]
    Using config file "/etc/xen/debian-lenny.cfg".
    Started domain debian-lenny
    [B][email protected]:~$ sudo xm list[/B]
    Name                                        ID   Mem VCPUs      State   Time(s)
    Domain-0                                     0   958     4     r-----      9.7
    debian-lenny                                 1   786     1     -b----      2.8
    [B][email protected]:~$ sudo xm console debian-lenny[/B]
    
    [I][ lots of boot output goes here ][/I]
    
    Starting periodic command scheduler: crond.
    
    Debian GNU/Linux 5.0 debian-lenny hvc0
    
    [B]debian-lenny login: root
    Password: [/B]
    Linux debian-lenny 2.6.26-2-xen-amd64 #1 SMP Thu Aug 20 00:36:34 UTC 2009 x86_64
    
    The programs included with the Debian GNU/Linux system are free software;
    the exact distribution terms for each program are described in the
    individual files in /usr/share/doc/*/copyright.
    
    Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
    permitted by applicable law.
    [B]debian-lenny:~# echo -e "\n\n\nThank you, \n"'Falko!!!'"\n\n\n"[/B]
    
    
    
    Thank you, 
    Falko!!!
    
    
    
    [B]debian-lenny:~# [/B]
    
     
    Last edited: Oct 29, 2009

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