Bash Script to SSH

luis84 · 08-01-2012, 08:05 PM

Hello,

I need a bash script to ssh into a list of servers, and add a user and set the password.

I have seen a number of telnet scripts but none for ssh.

I want it to ask for the user and password at start, is this possible and are there any example scripts?

Thank you

roger_heslop · 08-01-2012, 11:42 PM

A few ideas:

You can push a script to a server using:

Code:

 ssh server1.mydomain.com 'bash -s' < script.sh

Withing that script, you can create a user using the useradd command, with a beginning default password using:

Code:

passwd $usr1 << EOF
P@ssw0rd
P@ssw0rd
EOF

Finally, you can use the 'chage' command to ensure the user will have to change the password on login, as long as the lastday ( -d ) and maxdays ( -M ) together add up to a date before the present. Use 'man' for details.

Good luck!

kbp · 08-01-2012, 11:47 PM

If you want it to ask for the username and password at the start you might be better off with an expect script. There are many solutions to managing fleets of servers, heres my thoughts on a few:

- Some years ago I used cluster ssh quite happily, it required a little hotkey remapping to prevent conflict with [ctrl]+ combos but was solid otherwise.
- I also used puttycs when managing linux hosts from a windows pc, it was quite handy as you could create .cmd files with different sets of hosts.
- I've deployed func in the past, which provides great control using globbing for hostnames and runs simultaneously rather than sequentially.
- You could also implement a configuration management system such as puppet, it comes in open source or enterprise.

Configuration management is my current focus, it saves you having to work out who's been fiddling with what and why the system has stuff on it that you didn't put there.