Visit Our UNIX and Linux User Community


Script that tries to connect via SSH till connection is up


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Script that tries to connect via SSH till connection is up
# 1  
Old 08-09-2013
Script that tries to connect via SSH till connection is up

Hey,

I need a script that tries to connect via SSH to a remote server
and that remote server might not be up yet, so retry until succeed
the error message I get if the server is not up yet is:
Code:
ssh: connect to host 127.0.0.1 port 40001: Connection refused

any idea of a good way to do it ?

Thanks!

Last edited by OdedOvdat; 08-12-2013 at 04:33 PM..
# 2  
Old 08-09-2013
Code:
#bin/ksh
while :
do
   ssh myServer && break
done

# 3  
Old 08-09-2013
Suggestion: Use -q option to suppress ssh output.
# 4  
Old 08-12-2013
For safety, add a sleep to such I/O loop
Code:
while sleep 1
do
   ssh -q myServer && break
done

or
Code:
until ssh -q myServer
do
  sleep 1
done

# 5  
Old 08-12-2013
Quote:
Originally Posted by MadeInGermany
For safety, add a sleep to such I/O loop
True. As the server could be not responding for another reason (like keys not being exchanged) I'd also add a safety measure against ssh asking interactively for passwords. Using your suggestion:

Code:
until ssh -o BatchMode yes -q myServer ; do
       sleep 1
done

I hope this helps.

bakunin
# 6  
Old 08-13-2013
Works great
thanks guys
 

Previous Thread | Next Thread
Test Your Knowledge in Computers #144
Difficulty: Easy
IEEE designed POSIX around the common structure of the major competing variants of the Unix system, publishing the first POSIX standard in 1988.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Ssh script to validate ssh connection to multiple serves with status

Hi, I want to validate ssh connection one after one for multiple servers..... password less keys already setup but now i want to validate if ssh is working fine or not... I have .sh script like below and i have servers.txt contains all the list of servers #/bin/bash for host in $(cat... (3 Replies)
Discussion started by: sreeram4
3 Replies

2. Shell Programming and Scripting

Shell script to connect to multiple ssh servers

Hello, I have access to several linux servers (mostly centos based) located in a DC in another country. from day to day I need to login to each of them to do some work (they dont have gui/window manager installed, I work only from console), or even to just do a check like df -h for disc usage.... (3 Replies)
Discussion started by: MaRiOsGR
3 Replies

3. Shell Programming and Scripting

Passing password in script for ssh connection - no except

Used the script posted on forum - unix.com/shell-programming-scripting/21597-script-change-passwords-same-user-multiple-servers.html but the last question posted on this seems to be still unanswered, tried different things with no success, can someone help giving an way to pass the password via... (5 Replies)
Discussion started by: sapadmin
5 Replies

4. Shell Programming and Scripting

Mysql command after a SSH connection (Script)

Hi all, Im new at scripting and i need to run a few commands at work every hours so i decide to make a script but on 1 of the steps i have a the follwoing problem: The command i do is this: #!/bin/bash ssh root@asdasd001 'mysql -h A-db-1 -uroot -password --execute "show slave status"'... (3 Replies)
Discussion started by: Aparicio
3 Replies

5. Shell Programming and Scripting

SSH Connection drops - but does my script keep running?

Hello there. I'm fairly new to Linux, but I am connecting via SSH and PuTTY to a remote server, and I am running a fairly heavy MySQL script in a PHP page. Our connection here is dodgy to say the least and I get continuous disconnections. My question is, when I get disconnected, does my... (4 Replies)
Discussion started by: christatedavies
4 Replies

6. Shell Programming and Scripting

how to terminate ssh connection without terminating script

Hi all, I connect with SSH connection to remote machine in the script and ı want to logout at half of the script then continue to script. If ı write exit in the script it terminates script not SSH connection. How can i do that please help me (1 Reply)
Discussion started by: fozay
1 Replies

7. Shell Programming and Scripting

shell script for how to connect to a remote server by using ssh

i want to connect to a remote server through ssh. i have to also provide password within that script. after connecting to the remote server i want to do some operations like grep,cd etc can u pls help me to wite a script. Thanks (1 Reply)
Discussion started by: millan
1 Replies

8. Shell Programming and Scripting

ssh connection script

Hi all, I'm writing a script that chooses the best computer available in an open lab. The script works great except every now and then there is a dead computer in the lab that begins the ssh handshaking, but freezes after the following: debug1: Offering public key: When the script happens... (2 Replies)
Discussion started by: x-375HK-x
2 Replies

9. Shell Programming and Scripting

script to connect to different ip address thro telnet or ssh

Hi, I have three ip address say x.x.x.x , y.y.y.y and z.z.z.z I am connecting to x.x.x.x first and from there i do telnet or ssh to y.y.y.y and getting into y and from there i do telnet or ssh to z.z.z.z i want to know, can we write a script, which can automatically connect from x to y... (3 Replies)
Discussion started by: vasikaran
3 Replies

10. Shell Programming and Scripting

Remote SSH Connection Using Script

Hi, I am new to Shell Scripting. Can anybody help me in writing a Script Which Could Login from a Unix box to a Remote Unix box which accepts the user credentials automatically and display the result for checking the Disk Space Utilisation (Without running any SSH agent). (1 Reply)
Discussion started by: ajith_tg
1 Replies

Featured Tech Videos