Permission denied while executing a command on a remote machine using pdsh

Question

I am able to connect to a remote machine using following command:

/usr/bin/adm/pdsh -l root -w "loop" pdsh>

but when i try to execute any command it gives following error:

pdsh> cd /var

loop: Permission denied, please try again.

loop: Permission denied, please try again.

loop: Permission denied (publickey,password).

pdsh@rushi: loop: ssh exited with exit code 255

please can anyone provide any solution to this.

Thanks.

Answer 1

The problem is that you don't have permission to log on the remote machine. When you type the first command "pdsh ...", it really doesn't connect to the server. It does when you try to execute any command, like "cd /var". As pdsh is intended to execute commands in parallel, I suggest you to configure public key authentication:

1. Do 'ssh-keygen -t rsa' on your server. You will be prompted to select the name and location of the key and the key.pub files.
2. Open the .pub file you generated on the previous step and copy the full text.
3. Paste that text on the /root/.ssh/authorized_keys file on the remote server (loop). If the file does not exist you can create it safely. ( Remember to set appropiate perms, like 600 ).
4. Profit!.