• [6.11.5] allocated PTY's not unallocated on close

    capino

    By capino

      • Solved Minor

    When using a webbrowser to open a docker container console, multiple pty's are allocated, but not all are unallocated on close.
    This can lead to not being able to open a pty when the amount of allocated pty's gets to high with the following message: 

    OCI runtime exec failed: exec failed: unable to start container process: open /dev/ptmx: no space left on device: unknown

     

    A reboot is needed to free up the allocated PTY's

    A workaround is to increase the max pty's by running:  

    sysctl -w kernel.pty.max=8192


    I have tested this in FireFox, Brave, Safari and Chrome.

    • Thanks 1
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    ChatNoir
    4 hours ago, carthis said:

    +1

    Are you still seeing the problem on 6.12.2 ?

    Because nothing will be changed on 6.11.x

    Link to comment
    capino

     

    I did some quick testing on 6.12.2 and it seems to be fixed.

    When opening a docker console only one pts session is allocated. This allocation seems to close when exiting the session by running the exit command on the first try (In 6.11.x I sometimes had to run the exit command twice). The pts allocation is also closed when closing the browser tab without exiting the session by running the exit command. 

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