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I am using Linux containers with Proxmox 4. When I am connected on an Ubuntu 16.04 container with:

pct enter <id>

I run a script with screen and try to watch the process running with:

screen -x <processname>

I got the error:

Must be connected to a terminal error

When I connect with:

ssh -t <user>@<container_ip>

It works, I can attach the display to the screen.

How can I use screen -x when I am connected with pct enter ?

Vadim Kotov
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Phoax
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  • Not clear what `-x` provides you. Did you try `screen -t -x ..` ? Good luck. – shellter Sep 13 '16 at 15:03
  • `screen -x` allow to display a background script launched with the screen command. When I use the command `screen -t -x` I got the same error : _Must be connected to a terminal_. – Phoax Sep 13 '16 at 15:47

3 Answers3

17

I found a solution that works for same case(https://www.svennd.be/screen-in-lxc-attach)

Execute this

script /dev/null

Then you can run screen, et voila

Guik
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6

This is happening mostly because of the reason that you must have switched user to the current terminal user using the command sudo su or user changing command. You will need to own the shell on which you are working. You can do so by running this: script /dev/null.

Alternatively, You can restart the terminal session with the user(which was used when creating screen) and not coming to current user using switch user commands.

To know active screens : screen -list

mannutech
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    This explanation makes no sense at all. `script` is not a command for owning a shell, and `sudo` is unrelated to a lack of a controlling terminal because it does not adjust the controlling terminal. – JdeBP Dec 10 '19 at 13:31
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Alternatively, You can start the session within "hohup" and send to background

Claudio Lazaro
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  • Welcome to StackOverflow. Did you mean `nohup` instead of `hohup`? Please [edit] your answer to fix. – Mark Stewart Dec 30 '20 at 23:42
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