How to SSH for remote execution

[santosh jha]

Hi ,

I am designing a script where i need to execute some commands on different server from one server.

Previously i was using "remsh" to accomplis this but now i have to move away from "remsh" and use "ssh" instead.

Please guide me how to do it.

Regards

Santosh Jha

[Sivakumar TS · Accepted solution]

Dear Santosh,

Check out this link

http://www.employees.org/~satch/ssh/faq/INSTALL.txt

HtH,

Siva.

[Senthil Prabu.S_1]

Hi,
you can use your script as before, only changing the remsh with ssh [correct syntak]. check man ssh for syntak.


Also, you can use use public key authentication using SSH which helps a lot in automation so that password less authentication happends between two machines.

[santosh jha]

Senthin could you please me the command if for example i am in "server1" logged in as "oracle" and i want to execute "ls" on "server2" with the same user on that machine.

[Thummalu]

here it is

if both the servers are having correct host based authentication keys, then
from server1

ssh -q server2 ll

will work fine :)

br
Thummalu

[Senthil Prabu.S_1]

Hi santhosh,
ssh -l oracle server2 ls


This you have to incorpate in your script on the server1.

If you want to do many operations on remote m/c, then

ssh -l oracle server2 << EOF
ls
pwd
netstat -na
EOF

hth,
Prabu.S

If you want steps for using pasword less authentication, I can also send them

[Arunvijai_4]

You need to work on password less authentication with SSH server and client, have a look at this thread, it will guide you

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=851253

-Arun

[Jaroslav Matys]

Just briefly:
1) Generate your identity on unix_box

If you already have created your identity (file /home/your_login/.ssh/id_rsa exists), please skip this step otherwise you will destroy your previous setup.
This setup you will do only once per user and system.

ssh-keygen -t rsa

2) Distribute your identity to other nodes
This setup you have to do for every user and system from which you want to conect for all users and systems you want to connect to :
2.1 Create .ssh directory on targer_node
ssh target_user@target_node [ ! -d /home/your_login/.ssh ] && (mkdir /home/your_login/.ssh;chmod 700 /home/your_login/.ssh)
2.2 Copy your public identity to target
cat /home/your_login/.ssh/id_rsa.pub | ssh target_user@target_node tee -a /home/your_login/.ssh/authorized_keys

3) Simply use ssh and scp or sftp
ssh target_node
ssh your_login@target_node
ssh your_login@target_node command parameter

[Tor-Arne Nostdal]

Just a small comment to Jaroslav's nice description.
Substitute: /home/your_login
with: ~your_login

~your_login will point to the home-directory of user your_login regardless if it is on /home or elsewhere...

/2r