Is it possible to view a screen process started by another user?

Shimdidly · 04-19-2012, 04:57 PM

Hi, my friend has a minecraft server process running under a screen. Typing 'screen -r' tells me there's no screen to be resumed. However, 'ps aux' shows this.

Code:

david     1340  0.0  0.0   5384   152 ?        Ss   Apr08   0:00 SCREEN -dmS minecraft java -Xms256M -Xmx256M -jar minecraft_server.jar nogui
david     1341  6.0 61.7 570560 313080 pts/2   Ssl+ Apr08 1018:18 java -Xms256M -Xmx256M -jar minecraft_server.jar nogui

Is there any way for me (root) to grab/view this screen?

Kustom42 · 04-19-2012, 05:01 PM

Use screen -ls to list all screens. You can then rejoin a screen by specifying its number with screen -r. By default screen -r will look to rejoin a screen previously started by your user. I use this method every day when handing off projects from one team member to another.

Kustom42 · 04-19-2012, 05:03 PM

Bookmark http://www.rackaid.com/resources/lin...al-and-how-to/

Shimdidly · 04-19-2012, 06:39 PM

It says,

Code:

shimdidly@diwars:~$ screen -ls S-david
No Sockets found in /var/run/screen/S-shimdidly.

Same story for root. I looked in the /var/run/screen folder and found S-david/1340.minecraft. I've tried 'screen -r 1340.minecraft' and I've tried:

Code:

shimdidly@diwars:~$ sudo screen -r david/1340.minecraft
[sudo] password for shimdidly: 
There is a screen on:
	1340.minecraft	(04/08/2012 12:37:51 AM)	(Private)
There is no screen to be attached matching 1340.minecraft.

I feel like I'm getting close but it's still not letting me attach to the screen.

Shimdidly · 04-20-2012, 09:08 AM

What I don't understand is why there is support for a feature that doesn't work? The manual lays it out plainly:

Code:

screen -r sessionowner/[[pid.]tty[.host]]

However, any combination of
'sudo screen -r david/1340.minecraft'
'sudo screen -r david/minecraft'

doesn't let me do anything. (As seen on the previous post). Why is there allegedly multi-user support when it won't let you view another user's process anyway? Seems so pointless.

jschiwal · 04-20-2012, 09:22 AM

The remote user needs to enter
:multiuser
:acladd yourusername
before you can attach to its screen session.

Kustom42 · 04-20-2012, 11:08 AM

You can create a .screenrc file in the home directory of your users specifying those options as well. The default screen install I have always done allows other users to take over sessions by default so I've never ran into that issue.