Ping scripting Post: 303024357

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Top Forums Shell Programming and Scripting Ping scripting Post 303024357 by RudiC on Sunday 7th of October 2018 04:38:00 AM

10-07-2018

Registered User

Welcome to the forum.

Quote:

Originally Posted by Jeffm0342

This is my first posting here, I haven't found exactly what I'm looking for anywhere else so I'm hoping you all can help. I have a portion of script here that needs to ping two servers, then return whether they are up or down (somehow), and then echo that information. Here is what I have so far. It does echo up/down, but the information doesn't change regardless of the ping success.

Not quite true. It does change: 2 up, 0 down, if the last ping fails, 1 up, 1 down, if it succeeds.

There seems to be one basic misunderstanding: the $? variable represents the exit code of the last command executed; the before last's is overwritten. So your first ping's result is lost. So, you need to evaluate it after each ping, e.g. with another if construct. Doable, but tedious and ineffective.

How about a different approach? Collect the respective exit codes, and do some math afterwards? Like

Code:

ping -c1 -W1 192.168.0.1 > /dev/null; X1=$?
ping -c1 -W1 192.168.0.1 > /dev/null; X2=$?
echo "Servers up: $((2-X1-X2)) Servers down: $((X1+X2))"

The -q is redundant if you redirect output to /dev/null. I introduced the -W timeout option to reduce execution / waiting time.

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LEARN ABOUT SUSE

ocf_pacemaker_ping

OCF_PACEMAKER_PING(7)					      Pacemaker Configuration					     OCF_PACEMAKER_PING(7)

NAME

       ocf_pacemaker_ping - node connectivity

SYNOPSIS

       [OCF_RESKEY_pidfile=string] [OCF_RESKEY_dampen=integer] [OCF_RESKEY_name=string] [OCF_RESKEY_multiplier=integer]
       [OCF_RESKEY_host_list=string] [OCF_RESKEY_attempts=integer] [OCF_RESKEY_timeout=integer] [OCF_RESKEY_options=string]
       [OCF_RESKEY_debug=string]

       ping [start | stop | reload | monitor | meta-data | validate-all]

DESCRIPTION

       Every time the monitor action is run, this resource agent records (in the CIB) the current number of ping nodes the host can connect to. It
       is essentially the same as pingd except that it uses the system ping tool to obtain the results.

SUPPORTED PARAMETERS

       OCF_RESKEY_pidfile = string [/var/run//ping-default]
	   PID file

       OCF_RESKEY_dampen = integer [5s]
	   Dampening interval

	   The time to wait (dampening) further changes occur

       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_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_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 ping.

       OCF_RESKEY_debug = string [false]
	   Verbose logging

	   Enables to use default attrd_updater verbose logging on every call.

AUTHOR

       Andrew Beekhof <andrew@beekhof.net>
	   Author.

Pacemaker Configuration 					    07/05/2010						     OCF_PACEMAKER_PING(7)