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@InterfaceAudience.Public @InterfaceStability.Unstable public interface FenceMethod
A fencing method is a method by which one node can forcibly prevent another node from making continued progress. This might be implemented by killing a process on the other node, by denying the other node's access to shared storage, or by accessing a PDU to cut the other node's power.
Since these methods are often vendor- or device-specific, operators may implement this interface in order to achieve fencing.
Fencing is configured by the operator as an ordered list of methods to
attempt. Each method will be tried in turn, and the next in the list
will only be attempted if the previous one fails. See NodeFencer
for more information.
If an implementation also implements Configurable
then its
setConf
method will be called upon instantiation.
Method Summary | |
---|---|
void |
checkArgs(String args)
Verify that the given fencing method's arguments are valid. |
boolean |
tryFence(HAServiceTarget target,
String args)
Attempt to fence the target node. |
Method Detail |
---|
void checkArgs(String args) throws BadFencingConfigurationException
args
- the arguments provided in the configuration. This may
be null if the operator did not configure any arguments.
BadFencingConfigurationException
- if the arguments are invalidboolean tryFence(HAServiceTarget target, String args) throws BadFencingConfigurationException
serviceAddr
- the address (host:ipcport) of the service to fenceargs
- the configured arguments, which were checked at startup by
checkArgs(String)
BadFencingConfigurationException
- if the configuration was
determined to be invalid only at runtime
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