[one-users] retrieve info from OpenVZ host running libvirtd

[Héctor Sanjuán]

Hi Nikolay,

I had a similar problem and it came down to im driver files not having
the proper execution rights. Can you maybe check that?

Héctor

El 21/02/11 13:17, knawnd at gmail.com escribió:
> Hi Carlos,
> 
> Carlos Martín Sánchez wrote on 21/02/11 14:04:
>> Hi Nikolay,
>>
>> Could you paste the output of
>>      ssh <OVZ_cluster_node> "/var/tmp/one/im/run_probes ovz"
>> ?
> [oneadmin at FN]$ ssh edugrid10 "/tmp/one/im/run_probes ovz"
> Warning: Permanently added '<CN_hostname,CN_IP>' (RSA) to the list of
> known hosts.
>  [oneadmin at FN]$
> 
> i.e. it looks like the command above returns space character.
> 
> Nikolay.
>>
>> Change /var/tmp/one to your SCRIPTS_REMOTE_DIR if you changed it in your
>> oned.conf file.
>>
>> Regards,
>> Carlos.
>>
>> -- 
>> Carlos Martín, MSc
>> Project Major Contributor
>> OpenNebula - The Open Source Toolkit for Cloud Computing
>> www.OpenNebula.org <http://www.opennebula.org/> | cmartin at opennebula.org
>> <mailto:cmartin at opennebula.org>
>>
>>
>> On 18 February 2011 17:27, <knawnd at gmail.com <mailto:knawnd at gmail.com>>
>> wrote:
>>
>>     Dear all,
>>
>>     Trying to implement IM driver for OpenVZ cluster nodes I faced with
>>     the following problem:
>>
>>     $ onehost list
>>       ID NAME                           CLUSTER  RVM   TCPU   FCPU
>>     ACPU   TMEM    FMEM STAT
>>        2 <cluster_node1>         xen_x64           0       200      200
>>          200       3.1G     128M    on
>>        3 <cluster_node2>         ovz_x32           0            0  0
>>        100           0K          0K     err
>>
>>     oned.log:
>>     [...]
>>     Fri Feb 18 18:54:47 2011 [InM][D]: Host 3 successfully monitored.
>>     Fri Feb 18 18:54:47 2011 [ONE][E]: syntax error, unexpected $end,
>>     expecting VARIABLE at line 2, columns 1:2
>>     Fri Feb 18 18:54:47 2011 [InM][E]: Error parsing host information:
>>     [...]
>>
>>     I added oneadmin user into /etc/sudoers file and commented out the
>>     line "Defaults    requiretty":
>>     $ egrep "oneadmin|requiretty" /etc/sudoers
>>     #Defaults    requiretty
>>     oneadmin        ALL=(ALL)       NOPASSWD: ALL
>>
>>     (I couldn't figure out more secure and elegant way to get info from
>>     OpenVZ host having libvirt interface installed. Any suggestions on
>>     that?)
>>
>>     and did the following changes in ovz.rb file:
>>     $ diff /usr/lib/one/remotes/im/ovz.d/ovz.rb
>>     /usr/lib/one/remotes/im/kvm.d/kvm.rb
>>     29c29
>>     < nodeinfo_text = `sudo virsh -c openvz:///system nodeinfo`
>>     ---
>>      > nodeinfo_text = `virsh -c qemu:///system nodeinfo`
>>     90c90
>>     < print_info("HYPERVISOR","ovz")
>>     ---
>>      > print_info("HYPERVISOR","kvm")
>>
>>     "sudo virsh -c openvz:///system nodeinfo" running under oneadmin
>>     user from front-end node gives the following output:
>>     [oneadmin@<ONE_front-end>$ ssh <OVZ_cluster_node> sudo virsh -c
>>     openvz:///system nodeinfo
>>     CPU model:           i686
>>     CPU(s):              1
>>     CPU frequency:       2793 MHz
>>     CPU socket(s):       1
>>     Core(s) per socket:  1
>>     Thread(s) per core:  1
>>     NUMA cell(s):        1
>>     Memory size:         2056216 kB
>>
>>     I was hoping to apply the same solution as written in "KVM Driver
>>     Guide 2.0" (http://opennebula.org/documentation:rel2.0:kvmg) since
>>     ONE uses the libvirt interface as well to interact with KVM hosts:
>>     ...The following steps are required in the cluster nodes to get the
>>     KVM driver running:
>>     [...]
>>         *      The user with access to these remotes hosts on behalf of
>>     OpenNebula (typically <oneadmin>) has to pertain to the <libvirtd>
>>     and <kvm> groups in order to use the deaemon and be able to launch
>> VMs.
>>
>>     but I can't following that way since there is no libvirt group and
>>     libvirtd is run under root (I had to build libvirt from tarball
>>     available at its home page since CentOS has a pretty old one in its
>>     repos without openvz support).
>>
>>     Any help on that is highly appreciated!
>>     Nikolay.
>>     _______________________________________________
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>>     Users at lists.opennebula.org <mailto:Users at lists.opennebula.org>
>>     http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
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-- 
Héctor Sanjuan
OpenNebula.org