FENCE_AGENT(8) System Manager's Manual FENCE_AGENT(8)
NAME
fence_virt - Fencing agent for virtual machines using VM Channel
fence_xvm - Fencing agent for virtual machines using multicast
DESCRIPTION
fence_virt and fence_xvm are an I/O Fencing agents which can be used with virtual machines. Fence_xvm is backward compatible with
fence_xvmd.
Fence_virt and fence_xvm talk to fence_virtd, which supports multiple backend plugins, including:
- libvirt for single-node operation
- Cluster Checkpoints when using Linux-cluster release 3.0.0 or later
- libvirt-qpid for multi-node, non-cluster operation
For compatibility, fence_xvm may talk to fence_xvmd from linux-cluster release 2 or later.
fence_virt and fence_xvm accept options on the command line as well as from stdin. The fencing daemon sends parameters through stdin when
it execs the agent. The agent may be run by itself with command line options, which is useful for testing or turning on or off virtual
machines from scripts.
GENERAL PARAMETERS
-d Increment (command line) debug level
-H Virtual machine (domain UUID or name) to fence
-o Fencing action (null, off, on, reboot, status, monitor, list, or metadata) (Default Value: reboot). See the FENCING ACTIONS sec-
tion.
-t Fencing timeout (in seconds) (Default Value: 30)
-w Fencing delay (in seconds). The fence agent will wait the specified number of seconds before attempting a fencing operation.
(Default Value: 0)
MULTICAST PARAMETERS
These parameters are used only when using fence_virt in multicast mode (e.g. by running fence_xvm).
-i IP Family (auto, ipv4, ipv6) (Default Value: auto)
-a Multicast address (Default Values: 225.0.0.12 / ff02::3:1)
-p IP port (Default Value: 1229)
-T Multicast time-to-live (in hops) (Default Value: 2)
-r Multicast retransmit time (in 1/10sec) (Default Value: 20)
-C Authentication (none, sha1, sha256, sha512) (Default Value: sha256)
-c Packet hash strength (none, sha1, sha256, sha512) (Default Value: sha256)
-k Shared key file (Default Value: /etc/cluster/fence_xvm.key)
-u Specify if using fence_virt with older fence_xvmd installations which are using UUIDs. Fence_virtd ignores this parameter.
SERIAL
/VMCHANNEL PARAMETERS
These parameters are used only when using fence_virt in serial mode (e.g. by running fence_virt).
-D Serial device (fence_virt mode). On the host, the serial device must be mapped in each domain's configuration file. See
fence_virt.conf(5) for more information. Specifying a serial device causes fence_virt to use serial mode (as opposed to VMChannel
mode).
-P Serial parameters. (Default Value: 115200,8N1)
-A VMChannel IP address (Default Value: 10.0.2.179)
-p VMChannel IP port (Default Value: 1229)
GENERAL STDIN PARAMETERS
These parameters are passed to fence_virt via standard input if no command line options are present. They are presented to fence_virt in
the form:
name=value
debug Specify debugging level
port Virtual machine (domain UUID or name) to fence
action Fencing action (null, off, on, reboot, status, monitor, list, or metadata) (Default Value: reboot). See the FENCING ACTIONS sec-
tion.
timeout
Fencing timeout (in seconds) (Default Value: 30)
MULTICAST STDIN PARAMETERS
ip_family
IP Family ([auto], ipv4, ipv6) (Default Value: auto)
multicast_address
Multicast address (Defaults: 225.0.0.12 / ff02::3:1)
port IP port (Default Value: 1229)
multicast_ttl
Multicast time-to-live (in hops) (Default Value: 2)
retrans
Multicast retransmit time (in 1/10sec) (Default Value: 20)
auth Authentication (none, sha1, sha256, sha512) (Default Value: sha256)
hash Packet hash strength (none, sha1, sha256, sha512) (Default Value: sha256)
key_file
Shared key file (Default Value: /etc/cluster/fence_xvm.key)
use_uuid
Specify if using fence_virt with older fence_xvmd installations which are using UUIDs. Fence_virtd ignores this parameter.
SERIAL
/VMCHANNEL STDIN PARAMETERS
serial_device
Serial device. On the host, the serial device must be mapped in each domain's configuration file. See fence_virt.conf(5) for more
information. If specified, causes fence_virt to operate in serial mode (not specifying causes fence_virt to operate in VM Channel
mode).
serial_params
Serial parameters. Default=115200,8N1.
channel_ip
Channel IP. Default=10.0.2.179
ipport Channel port. Default=1229
FENCING ACTIONS
off
Destroy or turn off virtual machine.
reboot Reboot virtual machine; i.e. restart the virtual machine on the same host where it is currently running.
on Turn on a virtual machine. Note: Turning on a virtual machine only works with some fence_virt backends.
status Check whether a virtual machine is running or not.
monitor
Check the health of fence_virtd's backend plugin.
list List virtual machines which may be fenced by fence_virtd (not supported on all backends).
metadata
Print XML metadata to standard output.
SEE ALSO
fence_virtd(8), fence(8), fence_virtd.conf(5)
fence_virt (Fence Agent) 2009-12-04 FENCE_AGENT(8)