Unix shell script - login to multiple server

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Unix shell script - login to multiple server

Asked by Babu Sampath

at 2024-07-19 07:36:49

Point:500 Replies:9 POST_ID:829029USER_ID:11932

Topic:

Linux;;

Hello experts,
i have to login to multiple servers using ssh and i wish to automate it,

after doing ssh,
it prompts - Are you sure you want to continue connecting (yes/no)? --> i need to give input as yes
then it prompts for password ----> i need to input my password then
and execute a command and log out.

Please let me know a way to automate it.

i have checked sshpass utility is not present in the server im working on. please suggest.

thanks

Expert: Gerwin Jansen replied at 2024-07-22 07:14:12

Generate SSH keys on the server that you have access to, add public key to the other servers ~/.ssh/authorized_keys

Then from the server that you have access to, run a command like this:

ssh user@other_server_1 command

Test with a few servers first, then add the public keys to the others.

Author: Babu Sampath replied at 2024-07-22 06:31:24

yes...i understand but if you see i have few hundreds of server, to setup ssh across all is going to take a considerable time.#
the username/password im going to use to the servers is same.

Im not against ssh, please let me know if there is a way to speedup ssh setup in this case.

Expert: Gerwin Jansen replied at 2024-07-22 06:13:48

>> but we need a solution to fix it
Using SSH keys will do just that for you.

Author: Babu Sampath replied at 2024-07-22 02:52:35

Yes, we are aware its a bad practise but we need a solution to fix it..
it is the need of this moment :(.

Expert: Gerwin Jansen replied at 2024-07-19 13:07:20

Using passwords on a command line is a bad practice. Setup SSH keys and automation is easy just do:

ssh user@server command

There are some previously answered quesions about setting up SSH keys here at EE like this one for example:

http://www.experts-exchange.com/Networking/Protocols/SSH_Telnet/Q_23292354.html

Expert: duncanb7 replied at 2024-07-19 08:40:06

Sorry, missing it is linux tag

Please get to know what is the exact port from adminstrator
I think the thing is similar to linux

Duncan

Author: Babu Sampath replied at 2024-07-19 08:38:15

Thanks for the reply Duncan.

I cant do it from command line, i have to execute the script from a server..it is because of security..access to these servers from my desktop is not allowed.

I checked your command from the server it says - Bad port 'w'.

Expert: duncanb7 replied at 2024-07-19 08:28:38

Be reminded, if the SSH change, the command should be this, where 8888 is just example
port change

c:program fiies <x86>Puttyputty.exe -ssh yourogin@214.3..211283 -pw yourpassword -P 8888

Duncan

Expert: duncanb7 replied at 2024-07-19 08:26:38

putty.exe can run at command-line such as

c:program fiies <x86>Puttyputty.exe -ssh yourogin@214.3..211283 -pw yourpassword

You can make easy batch script to login all server automatically

Duncan

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