Ssh script to validate ssh connection to multiple serves with status Post: 303018342

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Top Forums UNIX for Beginners Questions & Answers Ssh script to validate ssh connection to multiple serves with status Post 303018342 by rbatte1 on Monday 4th of June 2018 09:30:18 AM

06-04-2018

Moderator

Depending how many you are poking, you might consider these adjustments too:-

Code:

#!/bin/bash
for host in $(cat servers.txt)
do
        ssh -q -o ConnectTimeout=3 "$host" "hostname"
done > test.log

The blue -q is to suppress some of the normal output to keep your log file a little clearer, however the log file will probably still collect anything that is displaed by the server login process e.g. from /etc/profile or ~/.bashrc

I've added the green to speed up the timeout if the server does not respond. You might want to adjust it depending on what your network will allow.

The red hostname is a command to run on the server you are connecting to. You have $HOSTNAME which may be undefined or set to anything in the shell's environment prior to this script.

What output do you actually want? Is it a list of hosts you could not connect to? If you can open the IP connection, but if fails to sign in how would you handle that? You script would probably just hang. Other conditions may cause your script to carry on to the next host immediately, e.g. the server's public key is different and you get an alert about a possible man-in-the-middle attack. The ssh exits with a non-zero return code, but you don't check. Perhaps you just want a list of successes to then target those that don't let you connect. Knowing the goal would be useful for us.

Robin

rbatte1

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LEARN ABOUT DEBIAN

colorgccrc

COLORGCCRC(5)							File Formats Manual						     COLORGCCRC(5)

NAME

       colorgccrc - configuration file for colorgcc

DESCRIPTION

       A colorgccrc configuration file is used to configure the highlighting of the compiler output from colorgcc.

SYNTAX

       Each  line  consists  of  a  keyword  designating  a configuration variable.  The keyword is followed by `:' and then one or several values
       (depending on the keyword).  Lines beginning with a hash mark `#' are comments.

CONFIGURATION VARIABLES

       g++ | gcc | c++ | cc | g77 | gcj | gnat | gpc
	      Specifies the paths to the compilers.  Takes one value; a path to the compiler.

       nocolor
	      Specifies what terminal types colorization should be disabled on.  Takes one or several values, separated by whitespace.

       srcColor
	      Specifies the highlighting attributes source-code should be given.  Takes one or several color attributes.  See  the  section  COLOR
	      ATTRIBUTES for more information.

       introColor
	      Specifies  the  highlighting  attributes	for normal compiler output.  Takes one or several color attributes.  See the section COLOR
	      ATTRIBUTES for more information.

       warningFileNameColor | errorFileNameColor
	      Specifies the highlighting attributes for the filename in a  warning  or	an  error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningNumberColor | errorNumberColor
	      Specifies  the  highlighting  attributes	for  the  line-number  in a warning or an error, respectively.	Takes one or several color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningMessageColor | errorMessageColor
	      Specifies the highlighting attributes for the message-text in a warning or an error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

COLOR ATTRIBUTES

       The following attributes are valid for highlighting.

       clear, reset

       bold, underline, underscore, blink, reverse, concealed

       black, red, green, yellow, blue, magenta, cyan, white

       on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white

SEE ALSO

       gcc(1), colorgcc(1)

HISTORY

       Jan 15 2003: Initial version of this manual-page.

REPORTING BUGS

       Report bugs to <jmoyers@geeks.com>

AUTHORS

       Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.

       This  manual  page  was	written  by Joe Wreschnig <piman@sacredchao.net>, and modified by David Weinehall <tao@debian.org>, for the Debian
       GNU/Linux system (but may be used by others).

COPYRIGHT

       Copyright (C) 2003 Jamie Moyers
       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.

								   Jan 15, 2003 						     COLORGCCRC(5)