[one-users] A question (maybe bug) on parsing xentop outputs in var/remotes/vmm/xen/poll

[Javier Fontan]

Can you send me the output of /usr/sbin/xentop -bi2? I'll check if
there's something wrong with our parser.

On Fri, Apr 8, 2011 at 11:06 AM, Jiachen Yang <farseerfc at gmail.com> wrote:
> Hello everyone using OpenNEbular:
>
> I recently installed ONE on my xen hosts and begin to study how to use
> this excellent cloud management tool.
> When I configured my hosts according to the user guide, I happily
> submitted my first vm to one. After prologing, I got this kind of
> error message of my vm.log:
>
> Fri Apr  8 15:36:26 2011 [VMM][I]: Command execution fail: 'if [ -x
> "/var/tmp/one/vmm/xen/poll" ]; then /var/tmp/one/vmm/xen/poll one-2;
> else                              exit 42; fi'
> Fri Apr  8 15:36:26 2011 [VMM][I]: STDERR follows.
> Fri Apr  8 15:36:26 2011 [VMM][I]: Error executing sudo /usr/sbin/xentop -bi2
> Fri Apr  8 15:36:26 2011 [VMM][I]: /var/tmp/one/vmm/xen/poll:186:in
> `get_vm_info': undefined method `[]' for nil:NilClass (NoMethodError)
> Fri Apr  8 15:36:26 2011 [VMM][I]: from
> /var/tmp/one/vmm/xen/poll:310:in `print_one_vm_info'
> Fri Apr  8 15:36:26 2011 [VMM][I]: from /var/tmp/one/vmm/xen/poll:344
> Fri Apr  8 15:36:26 2011 [VMM][I]: ExitCode: 1
> Fri Apr  8 15:36:26 2011 [VMM][E]: Error monitoring VM, Error
> executing sudo /usr/sbin/xentop -bi2
>
> I typed the ruby code of poll in irb manually and found that
> get_all_vm_info returned Nil.
>
> When I tried to read and understand the source of poll then I met this line:
>
>    def self.get_all_vm_info
>    begin
>         # ...
> !       domain_lines=valid_lines[4..-1]
>        # ......
>
> I want to ask why domain_lines start from 4th line in valid_lines?
> When I typed these codes into irb, valid_lines.length == 3. There were
> no 3rd and 4th items in valid_lines.
>
> I changed it to:
>         domain_lines=valid_lines[1..-1]
>
> And all seems to work perfect on my hosts.
>
> I want to know whether this is a bug or it has its intentions to start
> from the 4th line in valid_lines.
>
>
> About my host configuration:
> I got 2 host installed SLES 11 sp1 and Xen3.3.
> I added these hosts to ONE using:
> onehost linux-front im_xen vmm_xen tm_ssh
>
> -------------------------------------------------------------------------------------------------
> Jiachen Yang
> School of Software Engineering
> Shanghai Jiaotong University
> Tel. (+86) 13774494600
>
> farseerfc at sjtu.edu.cn
> firechildren at 163.com
> farseerfc at gmail.com (gtalk)
> firechildren at hotmail.com (msn)
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>



-- 
Javier Fontan, Grid & Virtualization Technology Engineer/Researcher
DSA Research Group: http://dsa-research.org
Globus GridWay Metascheduler: http://www.GridWay.org
OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org