Fedora, ssh and sudo
- by Ricky Robinson
I have to run a script remotely on several Fedora machines through ssh.
Since the script requires root priviliges, I do:
$ ssh me@remost_host "sudo touch test_sudo" #just a simple example
sudo: no tty present and no askpass program specified
The remote machines are configured in such a way that the password for sudo is never asked for.
For the above error, the most common fix is to allocate a pseudo-terminal with the -t option in ssh:
$ ssh -t me@remost_host "sudo touch test_sudo"
sudo: no tty present and no askpass program specified
Let's try to force this allocation with -t -t:
$ ssh -t -t me@remost_host "sudo touch test_sudo"
sudo: no tty present and no askpass program specified
Nope, it doesn't work.
In /etc/sudoers of course I have this line:
#Defaults requiretty
... but I can't manually change it on tens of remote machines.
Am I missing something here? Is there an easy fix?
EDIT:
Here is the sudoers file of a host where ssh me@host "sudo stat ." works.
Here is the sudoers file of a host where it doesn't work.
EDIT 2:
Running tty on a host where it works:
$ ssh me@host_ok tty
not a tty
$ ssh -t me@host_ok tty
/dev/pts/12
Connection to host_ok closed.
$ ssh -t -t me@host_ok tty
/dev/pts/12
Connection to host_ok closed.
Now on a host where it doesn't work:
$ ssh me@host_ko tty
not a tty
$ ssh -t me@host_ko tty
not a tty
Connection to host_ko closed.
$ ssh -t -t me@host_ko tty
not a tty
Connection to host_ko closed.
