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Old 12-18-2014, 05:09 AM   #1
pugazhendhi_r@yahoo.com
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Automate SSH in bash scripts


Hi All,
I have 54 servers, need to run daily monitoring and utilization scripts at peak hours. I created a cron job in each server and redirected it to a file. Then i will scp to a server. The problem is to frequently need to change to script.
Is there any possibility to automate ssh without prompting for password only in bash scripts but not like ssh-key-gen (passwordless authentication)


Thanks
 
Old 12-18-2014, 05:28 AM   #2
veerain
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You make ssh ask password for once and then you can run as many times as possible.

You have to do:

1) Run
ssh-agent
It will show some output. Just export shown variables in the shell

2) Next run
ssh-add
It will ask for password for the key
Give it.

3) And from now on no password would be asked.

For using shell script to automate; I don't know the way.
 
Old 12-18-2014, 05:33 AM   #3
descendant_command
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Quote:
Originally Posted by pugazhendhi_r@yahoo.com View Post
but not like ssh-key-gen (passwordless authentication)
Why not?
 
Old 12-18-2014, 05:52 AM   #4
wpeckham
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automate ssh

1. There is a lot of automation available directly in OpenSSH. I am not sure why you would avoid using keys, because that is the easiest way. Check the file options, config in .ssh folders, etc.

2. There are ssh tools NOT in the OpenSSH tree that allow password specifications in file, stored configuration, or on the command line. Command-line is NOT secure (anyone with a shell can see your passwrod if they look at the right time) but it can work. Examples: the putty tools for linux, lftp.

3. My preferred methods include using an rsyslogd server and logging all important metrics to non-standard log files over syslogd. That way the only load on the production is actually running the capture, all report extracts run on or against the log server taking that load off of production.

4. I workined on PSSP for a few years, and learned to recreate commands like dsh to propogate a command or scvript execution over any number of hosts from one management console (or my workstation). I did use keys, and recommend using keys, but there are MAY other options, and every fully experienced sysadmin has a few. If nothing you find fits you, get creative. Your own solution may fit your environment and use case better than ANYONE elses ideas.
 
Old 12-18-2014, 07:45 AM   #5
Teufel
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Quote:
Originally Posted by pugazhendhi_r@yahoo.com View Post
Is there any possibility to automate ssh without prompting for password only in bash scripts but not like ssh-key-gen (passwordless authentication)
if I've understood you correctly, you need sshpass utility intended for passing a password through ssh without typing it on every connection, e.g. from script.
 
Old 12-18-2014, 08:00 AM   #6
pugazhendhi_r@yahoo.com
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Quote:
Originally Posted by descendant_command View Post
Why not?
it will make that user to access without password in future whenever want to access know so need to access only when script need to run
 
Old 12-18-2014, 01:11 PM   #7
descendant_command
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Quote:
Originally Posted by pugazhendhi_r@yahoo.com View Post
it will make that user to access without password in future whenever want to access know so need to access only when script need to run
You can specify a separate identity file with -i, then you can remove that file when access should be denied.
 
Old 12-18-2014, 06:05 PM   #8
LeoPap
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Did you managed to do it?
 
Old 12-18-2014, 06:14 PM   #9
pugazhendhi_r@yahoo.com
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Quote:
Originally Posted by Teufel View Post
if I've understood you correctly, you need sshpass utility intended for passing a password through ssh without typing it on every connection, e.g. from script.
sshpass is very useful.... i tried
 
  


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