proper way to sudo over ssh

Question

I have a script which runs another script via SSH on a remote server using sudo. However, when I type the password, it shows up on the terminal. (Otherwise it works fine)

Answer 1

echo $VAR_REMOTEROOTPASS | ssh -tt -i $PATH_TO_KEY/id_mykey $VAR_REMOTEUSER@$varRemoteHost 
echo \"$varCommand\" | sudo bash

Answer 2

Depending on your usage, I had success with the following:

ssh root@server "script"

This will prompt for the root password and then execute the command correctly.

Answer 3

Another way is to use the -t switch to ssh:

ssh -t user@server "sudo script"

See man ssh:

 -t      Force pseudo-tty allocation.  This can be used to execute arbi-
         trary screen-based programs on a remote machine, which can be
         very useful, e.g., when implementing menu services.  Multiple -t
         options force tty allocation, even if ssh has no local tty.

Answer 4

I faced a problem,

user1@server1$ ssh -q user1@server2 sudo -u user2 rm -f /some/file/location.txt

Output:
sudo: no tty present and no askpass program specified

Then I tried with

#1
vim /etc/sudoers
Defaults:user1    !requiretty

didn't work

#2
user1   ALL=(user2)         NOPASSWD: ALL

that worked properly!

Answer 5

Assuming you want no password prompt:

ssh $HOST 'echo $PASSWORD | sudo -S $COMMMAND'

Example

ssh me@localhost 'echo secret | sudo -S echo hi' # outputs 'hi'

Answer 6

NOPASS in the configuration on your target machine is the solution. Continue reading at http://maestric.com/doc/unix/ubuntu_sudo_without_password