2018年2月8日 星期四

[Linux 常見問題] sudo: Sorry, you must have a tty to run sudo Error on a Linux and Unix

Source From Here 
Preface 
I‘m trying to run the following command: 
# ssh user@box.example.com sudo command1 /path/to/file

But, an error is displayed follows: 
sudo: sorry, you must have a tty to run sudo

OR 
sudo: no tty present and no askpass program specified

How do I fix this problem on Linux or Unix based systems? This is done in Fedora, RHEL, CentOS, many other Linux distribution, and Unix-like systems for security concern as it will show the password in clear text format 

What is the fix on a Linux or Unix bash shell? 
You have to run your ssh command as follows to avoid this error: 
# ssh -t hostname sudo command
# ssh -t user@hostname sudo command
# ssh -t user@box.example.com sudo command1 /path/to/file

Sample session: 
 

The -t option force pseudo-tty allocation. This can be used to execute arbitrary 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. 

The requiretty option in sudoers file 
The requiretty if set in sudo config file sudoers, sudo will only run when the user is logged in to a real tty. When this flag is set, sudo can only be run from a login session and not via other means such as cron, shell/perl/python or cgi-bin scripts. This flag is set on many distores by default. Edit /etc/sudoers, file, enter: 
# visudo

Find line that read as follows: 
  1. Defaults    requiretty  

Either comment it out the line or delete the line: 
  1. #Defaults    requiretty  

Save and close the file. 

How Do I run command without using the -t option? 
You can use the su command instead of the sudo command as follows: 
  1. ## NOTE: RHEL/CentOS specific syntax ##  
  2. su --session-command="/path/to/command1 arg1 arg2"  
  3.   
  4. ## others ##  
  5. su -c '/path/to/command1 arg1 arg2'  
OR 
  1. ssh user@server1.nixcraft.in su --session-command="/path/to/command1 arg1 arg2"   

OR 
  1. ssh user@server1.nixcraft.in su -c '/path/to/command1 arg1 arg2'  

You can run /scripts/job5143 as vivek user using the same syntax: 

  1. ssh user@server1.nixcraft.in su --session-command="/scripts/job1 /nas" vivek  

OR 
  1. ssh user@server1.nixcraft.in su vivek -c "/scripts/job1 /nas"  

Another option is to use the following syntax (see below in comments): 
# echo -e "\n"|sudo -S command

See man pages for more info – ssh(1),sudoers(5),visudo(8)

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