stonith − extensible interface for remotely powering down a node in the cluster
stonith −h |
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stonith [−s] [−h] −L |
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stonith [−s] [−h] −t stonith−device−type −n |
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stonith [−s] [−h] −t stonith−device−type {name=value... | −p stonith−device−parameters | −F stonith−device−parameters−file} [−c count] [−l] [−S] |
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stonith [−s] [−h] −t stonith−device−type {name=value... | −p stonith−device−parameters | −F stonith−device−parameters−file} [−c count] [−T {reset | on | off}] [nodename] |
The STONITH module provides an extensible interface for remotely powering down a node in the cluster (STONITH = Shoot The Other Node In The Head). The idea is quite simple: when the software running on one machine wants to make sure another machine in the cluster is not using a resource, pull the plug on the other machine. It's simple and reliable, albeit admittedly brutal.
The following options are supported:
−c count
Perform any actions identified by the −l, −S and −T options count times.
−F stonith−device−parameters−file
Path of file specifying parameters for a stonith device. To determine the syntax of the parameters file for a given device type run:
# stonith −t stonith−device−type −n
All of the listed parameters need to appear in order on a single line in the parameters file and be delimited by whitespace.
−h
Display detailed information about a stonith device including description, configuration information, parameters and any other related information. When specified without a stonith−device−type, detailed information on all stonith devices is displayed.
If you don't yet own a stonith device and want to know more about the ones we support, this information is likely to be helpful.
−L
List the valid stonith device types, suitable for passing as an argument to the −t option.
−l
List the hosts controlled by the stonith device.
−n
Output the parameter names of the stonith device.
name=value
Parameter, in the form of a name/value pair, to pass directly to the stonith device. To determine the syntax of the parameters for a given device type run:
# stonith −t stonith−device−type −n
All of the listed parameter names need to be passed with their corresponding values.
−p stonith−device−parameters
Parameters to pass directly to the stonith device. To determine the syntax of the parameters for a given device type run:
# stonith −t stonith−device−type −n
All of the listed parameter names need to appear in order and be delimited by whitespace.
−S
Show the status of the stonith device.
−s
Silent operation. Suppress logging of error messages to standard error.
−T action
The stonith action to perform on the node identified by nodename. Chosen from reset, on, and off.
Note
If a nodename is specified without the −T option, the stonith action defaults to reset.
−t stonith−device−type
The type of the stonith device to be used to effect stonith. A list of supported devices for an installation may be obtained using the −L option.
−v
Ignored.
To determine which stonith devices are available on your installation, use the −L option:
# stonith −L
All of the supported devices will be displayed one per line. Choose one from this list that is best for your environment − let's use wti_nps for the rest of this example. To get detailed information about this device, use the −h option:
# stonith −t wti_nps −h
Included in the output is the list of valid parameter names for wti_nps. To get just the list of valid parameter names, use the −n option instead:
# stonith −t wti_nps −n
All of the required parameter names will be displayed one per line. For wti_nps the output is:
ipaddr
password
There are three ways to pass these parameters to the device. The first (and preferred) way is by passing name/value pairs on the stonith command line:
# stonith −t wti_nps ipaddr=my−dev−ip password=my−dev−pw ...
The second way, which is maintained only for backward compatibility with legacy clusters, is passing the values in order on the stonith command line with the −p option:
# stonith −t wti_nps −p "my−dev−ip my−dev−pw" ...
The third way, which is also maintained only for backward compatibility with legacy clusters, is placing the values in order on a single line in a config file:
my−dev−ip my−dev−pw
... and passing the name of the file on the stonith command line with the −F option:
# stonith −t wti_nps −F ~/my−wtinps−config ...
To make sure you have the configuration set up correctly and that the device is available for stonith operations, use the −S option:
# stonith −t wti_nps ipaddr=my−dev−ip password=my−dev−pw −S
If all is well at this point, you should see something similar to:
stonith: wti_nps device OK.
If you don't, some debugging may be necessary to determine if the config info is correct, the device is powered on, etc. The −d option can come in handy here − you can add it to any stonith command to cause it to generate debug output.
To get the list of hosts controlled by the device, use the −l option:
# stonith −t wti_nps ipaddr=my−dev−ip password=my−dev−pw −l
All of the hosts controlled by the device will be displayed one per line. For wti_nps the output could be:
node1
node2
node3
To power off one of these hosts, use the −T option:
# stonith −t wti_nps ipaddr=my−dev−ip password=my−dev−pw −T off node
heartbeat(8), meatclient(8)
Alan Robertson <alanr@unix.sh>
stonith
Simon Horman <horms@vergenet.net>
man page
Florian Haas <florian.haas@linbit.com>
man page