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Full Discussion: Find the remote server status.
Top Forums Shell Programming and Scripting Find the remote server status. Post 302884449 by blackrageous on Monday 20th of January 2014 11:45:37 AM
Old 01-20-2014
Simple...ping by IP address. Let the cluster worry about the actual node you attach to in the case of B. Unless you can ping the unique IP addresses of the nodes that comprise the cluster (this of course depends on how the ip address is "shared" on the cluster nodes; i.e. round-robin) .

You can test the success/failure of the ping or the sftp (the ping is probably faster to give results since you can control it with a -c Count and -w timeout options). I would also trust ping more so than sftp for returning status of failure or success.

So you can do something like...

Code:
if ping -q -c3 -w 3 A
then
  sftp .... to A
else if ping -q -c3 -3 5 B
then
 sftp to B
else
 echo "Failed to sftp to either A or cluster B"
fi

or suppose you can ping the unique addresses of cluster B, say B1 and B2 (make sure you can, because cluster nodes unique ip addresses could be on a different segment depending on the cluster)...not really different...

Code:
if ping -q -c3 -w3 A
then
  sftp .... to A
else if ping -q -c3 -w3 B1
then
 sftp... to B1
else if else if ping -q -c3 -w3 B2 
 sftp... to B2
else
 echo "Failed to sftp to either A or B1 or B2"
fi

I did not test this but you should be able to get the idea.
 

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LEARN ABOUT DEBIAN

ocf_pacemaker_pingd

OCF_PACEMAKER_PINGD(7)					      Pacemaker Configuration					    OCF_PACEMAKER_PINGD(7)

NAME

       ocf_pacemaker_pingd - pingd resource agent

SYNOPSIS

       [OCF_RESKEY_pidfile=string] [OCF_RESKEY_user=string] [OCF_RESKEY_dampen=integer] [OCF_RESKEY_set=string] [OCF_RESKEY_name=string]
       [OCF_RESKEY_section=string] [OCF_RESKEY_multiplier=integer] [OCF_RESKEY_host_list=string] [OCF_RESKEY_interval=integer]
       [OCF_RESKEY_attempts=integer] [OCF_RESKEY_timeout=integer] [OCF_RESKEY_options=string]

       pingd [start | stop | monitor | meta-data | validate-all]

DESCRIPTION

       This agent (ocf:pacemaker:pingd) has been replaced by the more reliable ocf:pacemaker:ping. It records (in the CIB) the current number of
       ping nodes (specified in the 'host_list' parameter) a cluster node can connect to.

SUPPORTED PARAMETERS

       OCF_RESKEY_pidfile = string [/pingd-]
	   PID file

       OCF_RESKEY_user = string [root]
	   The user we want to run pingd as

	   The user we want to run pingd as

       OCF_RESKEY_dampen = integer [5s]
	   Dampening interval

	   The time to wait (dampening) further changes occur

       OCF_RESKEY_set = string []
	   Set name

	   The name of the instance_attributes set to place the value in. Rarely needs to be specified.

       OCF_RESKEY_name = string [pingd]
	   Attribute name

	   The name of the attributes to set. This is the name to be used in the constraints.

       OCF_RESKEY_section = string []
	   Section name

	   The section place the value in. Rarely needs to be specified.

       OCF_RESKEY_multiplier = integer []
	   Value multiplier

	   The number by which to multiply the number of connected ping nodes by

       OCF_RESKEY_host_list = string []
	   Host list

	   The list of ping nodes to count. Defaults to all configured ping nodes. Rarely needs to be specified.

       OCF_RESKEY_interval = integer [1]
	   ping interval in seconds

	   How often, in seconds, to check for node liveliness

       OCF_RESKEY_attempts = integer [2]
	   no. of ping attempts

	   Number of ping attempts, per host, before declaring it dead

       OCF_RESKEY_timeout = integer [2]
	   ping timeout in seconds

	   How long, in seconds, to wait before declaring a ping lost

       OCF_RESKEY_options = string []
	   Extra Options

	   A catch all for any other options that need to be passed to pingd.

AUTHOR

       Andrew Beekhof <andrew@beekhof.net>
	   Author.

Pacemaker Configuration 					    04/17/2012						    OCF_PACEMAKER_PINGD(7)
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