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Full Discussion: Check if remote destination is available before running scp command
Top Forums Shell Programming and Scripting Check if remote destination is available before running scp command Post 303015586 by stomp on Saturday 7th of April 2018 11:49:59 AM
Old 04-07-2018
Use ssh-option connecttimeout to not have to wait so long for the error to occur:
Code:
scp -o ConnectTimeout=5 file user@host:/dir/

In my ruby scripts for ssh i use the following steps(layed out in bash here) to set up an ssh connection, which wastes as little time as possible:

Code:
#!/bin/bash

LC_ALL=C
SSH_PORT=22
SSH_OPTS="-o ConnectTimeout=5 -o PasswordAuthentication=No"

export LC_ALL SSH_PORT SSH_OPTS

ping_test()      { ping -w 3 -i 0.2 -c3 "$1" &>/dev/null ; }
port_test()      { nmap -p $SSH_PORT -P0 "$1" | grep -qE "$SSH_PORT/tcp.*open" ; }
sshd_test()      { ssh -o Port=$SSH_PORT $SSH_OPTS -v "$1" date 2>&1 | grep -qE "Remote protocol version [0-9]+" ; }
ssh_login_test() { ssh -o Port=$SSH_PORT $SSH_OPTS "$1" echo ssh connect success 2>&1 | grep -qE "ssh connect success" ; }

check_ssh() {
  
   local target="$1"
   ping_test       "$target"    || return 1
   port_test       "$target"    || return 2
   sshd_test       "$target"    || return 3
   ssh_login_test  "$target"    || return 4   # this can be done as the same step with the step before
   return 0

}

# -- start of main program  

if check_ssh my_hostname; then
  if scp ... 
     ...
  fi
fi

Last edited by stomp; 04-07-2018 at 05:22 PM..
This User Gave Thanks to stomp For This Post:
rbatte1
 

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LEARN ABOUT SUSE

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								   May 31, 2007 							       BSD
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