Nodeupdown(3) User Contributed Perl Documentation Nodeupdown(3)NAMENodeupdown - Perl API for determining up and down nodes
SYNOPSIS
use Nodeupdown;
$obj = Nodeupdown->new([$host, [$port [$timeoutlen]]])
$upnodes = $obj->up_nodes()
@uplist = $obj->up_nodes()
$downnodes = $obj->down_nodes()
@downlist = $obj->down_nodes()
$bool = $obj->are_up(@nodes)
$bool = $obj->are_down(@nodes)
$num = $obj->up_count()
$num = $obj->down_count()DESCRIPTION
This package provides a Perl API for determining up and down nodes
Nodeupdown->new([$host, [$port]])
Creates and returns a Nodeupdown object. If the host, port, or
timeoutlen, are not specified, default values are assumed. On
error, undef is returned.
$obj->up_nodes()
Return the up nodes in a cluster. If the context in which the
subroutine is invoked is looking for a scalar, a hostlist formatted
string of up nodes will be returned. If the context in which the
subroutine is invoked is looking for a list, a list containing each
up node will be returned.
$obj->down_nodes()
Return the down nodes in a cluster. If the context in which the
subroutine is invoked is looking for a scalar, a hostlist formatted
string of down nodes will be returned. If the context in which the
subroutine is invoked is looking for a list, a list containing each
down node will be returned.
$obj->are_up(@nodes)
Returns 1 is all the nodes passed in are determined as up. Returns
0 if any node passed is not up.
$obj->are_down(@nodes)
Returns 1 is all the nodes passed in are determined as down.
Returns 0 if any node passed is not down.
$obj->up_count()
Returns the number of up nodes.
$obj->down_count()
Returns the number of down nodes.
BUGS
Please be careful with the semantics of are_up() and are_down(). Just
because a node is not up, does not mean it is down. For example, if an
improper node name is used (e.g. $obj->are_up("foobar"),
$obj->are_down("foobar")), both are_up() and are_down() will fail.
AUTHOR
Albert Chu <chu11@llnl.gov>
SEE ALSO
libnodeupdown.
whatsup.
perl v5.14.2 2012-07-30 Nodeupdown(3)
