[Linux-cluster] Problems using fence_virt as a fence agent for two kvm guests

[C. L. Martinez]

On Thu, Jul 12, 2012 at 11:27 AM, C. L. Martinez <carlopmart at gmail.com> wrote:
> Hi all,
>
>  I have installed two kvm guests (CentOS 6.3) to do some tests using
> RHCS under a CentOS 6.3 kvm host. As a fence device I am trying to use
> fence_virt, but it doesn't works for me.
>
>  fence_virt.conf in kvm host is:
>
> fence_virtd {
>         listener = "multicast";
>         backend = "libvirt";
> }
>
> listeners {
>         multicast {
>                 key_file = "/etc/fence_virt.key";
>                 interface = "siemif";
>                 address = "225.0.0.12";
>                 family = "ipv4";
>         }
> }
>
> backends {
>         libvirt {
>                 uri = "qemu:///system";
>         }
> }
>
> fence_virt.key is located under /etc directory:
>
> -r-------- 1 root root 18 Jul 12 09:48 /etc/fence_virt.key
>
> cluster.conf on both kvm guest nodes is:
>
> <?xml version="1.0"?>
> <cluster config_version="1" name="TestCluster">
>         <cman expected_votes="1" two_node="1"/>
>         <clusternodes>
>                 <clusternode name="cosnode01.domain.local" nodeid="1">
>                         <fence>
>                                 <method name="kvm">
>                                         <device action="reboot" port="cosnode01" name="kvm_cosnode01"/>
>                                 </method>
>                         </fence>
>                 </clusternode>
>                 <clusternode name="cosnode02.domain.local" nodeid="2">
>                         <fence>
>                                 <method name="kvm">
>                                         <device action="reboot" port="cosnode02" name="kvm_cosnode02"/>
>                                 </method>
>                         </fence>
>                 </clusternode>
>         </clusternodes>
>         <fencedevices>
>                 <fencedevice agent="fence_virt" ip_family="ipv4"
> multicast_address="225.0.0.12" key_file="/etc/cluster/fence_virt.key"
> name="kvm_cosnode01"/>
>                 <fencedevice agent="fence_virt" ip_family="ipv4"
> multicast_address="225.0.0.12" key_file="/etc/cluster/fence_virt.key"
> name="kvm_cosnode02"/>
>         </fencedevices>
>         <fence_daemon post_join_delay="30"/>
>         <totem rrp_mode="none" secauth="off"/>
>         <rm log_level="5">
>                 <failoverdomains>
>                         <failoverdomain name="only_node01" nofailback="1" ordered="0" restricted="1">
>                                 <failoverdomainnode name="cosnode01.domain.local"/>
>                         </failoverdomain>
>                         <failoverdomain name="only_node02" nofailback="1" ordered="0" restricted="1">
>                                 <failoverdomainnode name="cosnode02.domain.local"/>
>                         </failoverdomain>
>                         <failoverdomain name="primary_clu01" nofailback="1" ordered="1"
> restricted="1">
>                                 <failoverdomainnode name="cosnode01.domain.local" priority="1"/>
>                                 <failoverdomainnode name="cosnode02.domain.local" priority="2"/>
>                         </failoverdomain>
>                         <failoverdomain name="primary_clu02" nofailback="1" ordered="1"
> restricted="1">
>                                 <failoverdomainnode name="cosnode01.domain.local" priority="2"/>
>                                 <failoverdomainnode name="cosnode02.domain.local" priority="1"/>
>                         </failoverdomain>
>                 </failoverdomains>
>         </rm>
> </cluster>
>
> of course, fence_virt.key is copied under /etc/cluster dir in both nodes.
>
> In cosnode01 I see this error:
>
> fenced[4074]: fence cosnode02.domain.local dev 0.0 agent fence_virt
> result: error from agent
> fenced[4074]: fence cosnode02.domain.loca failed
>
> What am I doing wrong?? Do I need to modify libvirtd.conf to listen in
> siemif interface??
>
> Thanks.


Please, any help??