How to enable sudo commands over SSH without asking password?如何ssh到远程服务器执行sudo命令时不输入密码

问题：

I have server A and server B (both Ubuntu 10.04 LTS) doing different tasks. Server A needs to poke Server B, which generates a file and scp's it back to server A when done. This is all in-house and I am not too concerned about security issues. SSH Key exchange is already performed between servers A and B and works fine.

On server B, the script generateOfflineSig looks like

#!/bin/bash
echo "in script"
sudo apt-offline set offline_package.sig --install-packages "$0"
echo "after sudo"
scp offline_package.sig jeff@servera:/tmp

Also on server B, visudo has this entry:

jeff ALL=NOPASSWD: ALL

Which works if I execute sudo ls on Server B... no password asked.

Unfortunately SSH always asks for a password on Server A:

jeff@servera:~$ ssh -t jeff@serverb /home/jeff/generateOfflineSig "incron"
in script
[sudo] password for jeff:

Any ideas? This process can't be interrupted by password input.

 

回答：

It seems like I had a "typo" in the /etc/sudoers file...

jeff ALL=NOPASSWD: ALL

needed to be at the very end of file. Ubuntu Help only says Add (...) to the END of the file (if not at the end it can be nullified by later entries)

After that, password is never asked for "jeff's sudo commands, either locally or over SSH.