prep-host-for-vm-fencing.bash

#!/bin/bash

# On el6, to be run on the bare metal host after you have virtual networking
# set up.

yum install -y fence-virt fence-virtd fence-virtd-libvirt fence-virtd-multicast

for i in `ls /sys/class/net/*br*/bridge/multicast_querier`; do echo 1 > $i; done

if [ ! -f /etc/cluster/fence_xvm.key ]; then
  mkdir -p /etc/cluster
  dd if=/dev/random bs=512 count=1 of=/etc/cluster/fence_xvm.key
  if [ -d /mnt/vm-share ]; then
    cp /etc/cluster/fence_xvm.key /mnt/vm-share
  fi
fi

# alternatively, you could generate this file from "fence_virtd -c"
cat > /etc/fence_virt.conf <<EOF
fence_virtd {
        listener = "multicast";
        backend = "libvirt";
        module_path = "/usr/lib64/fence-virt";
}

listeners {
        multicast {
                key_file = "/etc/cluster/fence_xvm.key";
                address = "225.0.0.12";
                family = "ipv4";
                interface = "virbr0";
                port = "1229";
        }

}

backends {
        libvirt {
                uri = "qemu:///system";
        }

}
EOF

# you'll need to make this persistent
iptables -A INPUT -d 225.0.0.12/32 -p igmp -j ACCEPT


/sbin/service fence_virtd restart

# verify on your cluster vm's with:
# fence_xvm -o list