OCF_HEARTBEAT_ETHMON(7) OCF resource agents OCF_HEARTBEAT_ETHMON(7)NAMEocf_heartbeat_ethmonitor - Monitors network interfaces
SYNOPSIS
ethmonitor [start | stop | status | monitor | meta-data | validate-all]
DESCRIPTION
Monitor the vitality of a local network interface.
You may setup this RA as a clone resource to monitor the network
interfaces on different nodes, with the same interface name. This is
not related to the IP adress or the network on which a interface is
configured. You may use this RA to move resources away from a node,
which has a faulty interface or prevent moving resources to such a
node. This gives you independend control of the resources, without
involving cluster intercommunication. But it requires your nodes to
have more than one network interface.
The resource configuration requires a monitor operation, because the
monitor does the main part of the work. In addition to the resource
configuration, you need to configure some location contraints, based on
a CIB attribute value. The name of the attribute value is configured in
the 'name' option of this RA.
Example constraint configuration: location loc_connected_node
my_resource_grp rule ="rule_loc_connected_node" -INF: ethmonitor eq 0
The ethmonitor works in 3 different modes to test the interface
vitality. 1. call ip to see if the link status is up (if link is down
-> error) 2. call ip an watch the RX counter (if packages come around
in a certain time -> success) 3. call arping to check wether any of the
IPs found in the lokal ARP cache answers an ARP REQUEST (one answer ->
success) 4. return error
SUPPORTED PARAMETERS
interface
The name of the network interface which should be monitored (e.g.
eth0).
(unique, required, string, no default)
name
The name of the CIB attribute to set. This is the name to be used
in the constraints. Defaults to "ethmonitor-'interface_name'".
(unique, optional, string, no default)
multiplier
Multiplier for the value of the CIB attriobute specified in
parameter name.
(optional, integer, default 1)
repeat_count
Specify how often the interface will be monitored, before the
status is set to failed. You need to set the timeout of the
monitoring operation to at least repeat_count * repeat_interval
(optional, integer, default 5)
repeat_interval
Specify how long to wait in seconds between the repeat_counts.
(optional, integer, default 10)
pktcnt_timeout
Timeout for the RX packet counter. Stop listening for packet
counter changes after the given number of seconds.
(optional, integer, default 5)
arping_count
Number of ARP REQUEST packets to send for every IP. Usually one ARP
REQUEST (arping) is send
(optional, integer, default 1)
arping_timeout
Time in seconds to wait for ARP REQUESTs (all packets of
arping_count). This is to limit the time for arp requests, to be
able to send requests to more than one node, without running in the
monitor operation timeout.
(optional, integer, default 1)
arping_cache_entries
Maximum number of IPs from ARP cache list to check for ARP REQUEST
(arping) answers. Newest entries are tried first.
(optional, integer, default 5)
SUPPORTED ACTIONS
This resource agent supports the following actions (operations):
start
Starts the resource. Suggested minimum timeout: 20s.
stop
Stops the resource. Suggested minimum timeout: 20s.
status
Performs a status check. Suggested minimum timeout: 20s. Suggested
interval: 10s.
monitor
Performs a detailed status check. Suggested minimum timeout: 20s.
Suggested interval: 10s.
meta-data
Retrieves resource agent metadata (internal use only). Suggested
minimum timeout: 5s.
validate-all
Performs a validation of the resource configuration. Suggested
minimum timeout: 20s.
EXAMPLE
The following is an example configuration for a ethmonitor resource
using the crm(8) shell:
primitive p_ethmonitor ocf:heartbeat:ethmonitor \
params \
interface=string \
op monitor depth="0" timeout="20s" interval="10s"
SEE ALSO
http://www.linux-ha.org/wiki/ethmonitor_(resource_agent)AUTHOR
Linux-HA contributors (see the resource agent source for information
about individual authors)
resource-agents UNKNOWN 03/24/2013 OCF_HEARTBEAT_ETHMON(7)
