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Full Discussion: Alternate to pinging boxes
Top Forums UNIX for Advanced & Expert Users Alternate to pinging boxes Post 302150805 by bakunin on Wednesday 12th of December 2007 06:11:36 PM
Old 12-12-2007
traceroute might be shut out by the firewall, even a modest "ping -R" i have already seen being blocked by a firewall. But if you have *some* possible mode of connection you can use that to determine if the host is up. If this mode of connection is ssh, then use "ssh host date" or something such and analyze the output you get. A valid date would mean the host is up, if you get back nothing you can conclude the host is down.

What you really use for this purpose depends on what you are allowed to do on the remote host but i think the idea is clear.

bakunin
 

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initctl2dot(8)						      System Manager's Manual						    initctl2dot(8)

NAME
initctl2dot - manual page for initctl2dot SYNOPSIS
initctl2dot [OPTIONS] DESCRIPTION
Convert initctl(8) output to GraphViz dot(1) format. With no options, initctl(8) will be invoked automatically and the output written to file upstart.dot. OPTIONS
-h Display usage statement. -f INFILE , --infile=INFILE File to read initctl(8) output from ("initctl show-config -e"). If not specified, initctl(8) will be run automatically. -w OUTFILE , --outfile=OUTFILE File to write output to. -r RESTRICTIONS , --restrict-to-jobs=RESTRICTIONS Limit display of start on and stop on conditions to comma-separated list of jobs. --color-emits=COLOR_EMITS Specify color for 'emits' lines. --color-start-on=COLOR_START_ON Specify color for 'start on' lines. --color-stop-on=COLOR_STOP_ON Specify color for 'stop on' lines. --color-event=COLOR_EVENT Specify color for event boxes. --color-text=COLOR_TEXT Specify color for summary text. --color-bg=COLOR_BG Specify background color for diagram. --color-event-text=COLOR_EVENT_TEXT Specify color for text in event boxes. --color-job-text=COLOR_JOB_TEXT Specify color for text in job boxes. --color-job=COLOR_JOB Specify color for job boxes. AUTHOR
Written by James Hunt <james.hunt@ubuntu.com> REPORTING BUGS
Report bugs at <https://launchpad.net/upstart/+bugs> COPYRIGHT
Copyright (C) 2011 Canonical Ltd. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
init(8) initctl(8) Upstart 2011-03-07 initctl2dot(8)
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