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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 HPUX

ssh-keysign

ssh-keysign(1M)                                                                                                                    ssh-keysign(1M)

NAME

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

SYNOPSIS

       ssh-keysign

       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. This signature is of data that includes, among other items, the name of the client host and the  name  of  the
       client user.

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

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

       /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, readable
           only by root, and not accessible to others. Because they are readable only by root, ssh-keysign must  be  set-uid  root  if  host-based
           authentication is used.

       ssh-keysign will not sign host-based authentication data under the following conditions:

         o  If the HostbasedAuthentication client configuration parameter is not set to yes in /etc/ssh/ssh_config. This setting cannot be overri-
            den in users' ~/.ssh/ssh_config files.

         o  If the client hostname and username in /etc/ssh/ssh_config do not match the canonical hostname of  the  client  where  ssh-keysign  is
            invoked and the name of the user invoking ssh-keysign.

       In  spite of ssh-keysign's restrictions on the contents of the host-based authentication data, there remains the ability of users to use it
       as an avenue for obtaining the client's private host keys. For this reason host-based authentication is turned off by default.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsshu                     |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       ssh(1), sshd(1M), ssh_config(4), attributes(5)

AUTHORS

       Markus Friedl, markus@openbsd.org

HISTORY

       ssh-keysign first appeared in Ox 3.2.

                                                                    9 Jun 2004                                                     ssh-keysign(1M)
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