How do you run a program on a remote server using ssh?
For this example we’ll have two servers, one named Johnny and another named Cash. Both are running openssh. Our goal is to have a program on Johnny login to Cash and run a program on Cash. To make the task a little more complex we’ll be using different users on each machine. createssh
The first thing we’ll need to do is generate public and private keys on Johnny. So, logged into Johnny as user ‘boy’ we create public and private keys by creating them in the .ssh directory as follows: supermoz
Johnny$> pwd
/home/boy/.ssh
Johnny$> ssh-keygen -t rsa -f sue
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase): directory24x7
Enter same passphrase again:
Your identification has been saved in sue.
Your public key has been saved in sue.pub.
The key fingerprint is:
8d:e9:c0:g1:c7:1f:e3:b3:2f:38:12:aa:b5:3b:2e:b3 boy@Johnny
Johnny$>
In the example above we picked an arbitrary name, sue, to identify the files that hold the generated keys. When prompted to enter a passphrase (twice) we simply hit enter twice.
As the output of ssh-keygen indicates, the public key has been saved in a file named sue.pub.
The output of ssh-keygen implies, but doesn’t indicate directly, that the private key is in a file named sue (Yes, a user named boy created a file named sue.) buddylinks
Johnny$>ls -l
-rwx—— 1 sue suegrp 887 Oct 17 14:27 sue
-rwx—— 1 sue suegrp 223 Oct 17 14:27 sue.pub
The private key file, sue, will remain on Johnny for the reaminder of this exercise, but the public key must be moved to the remote server, Cash. Note that the .ssh directory itself, as well as the sue and sue.pub files should have permissions of 700. seoboost
Now you’ll need to ftp the sue.pub file from Johnny to Cash. The user on Cash that we’ll login as is user ‘named’.
Johnny$> ftp Cash
Connected to Cash
220 Cash – Propery of Xyz. – Authorized users only
Name (Cash:boy): named
331 Password required for named.
Password:
230-Last unsuccessful login: Fri Oct 17 13:12:55 2003 on ftp from Johnny 230-Last login: Fri Oct 17 16:02:11 2003 on /dev/pts/1 from Johnny
230 User named logged in.
ftp> cd .ssh
ftp> mput sue.pub
mput sue.pub? y
200 PORT command successful.
150 Opening data connection for sue.pub.
226 Transfer complete.
224 bytes sent in 0.000781 seconds (280.1 Kbytes/s)
local: sue.pub remote: sue.pub
ftp>bye
221 Goodbye.
Johnny$>
Now we’ll telnet into Cash and concatenate the sue.pub file into /home/named/.ssh/authorized_keys file.
Cash$> pwd
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