Container exits on SIGWINCH

[ChestersGarage]

Hello,

In -it mode, the container exited just by me opening a new tab in the terminal window (Ubuntu 14.04 host). Logged output:

[Fri Dec 25 02:41:50.249974 2015] [mpm_event:notice] [pid 1:tid 139752883230592] AH00492: caught SIGWINCH, shutting down gracefully

Thanks!

[yosifkit]

I think this is an issue of how httpd handles this particular signal. Is there a need to run it interactively? Or would -d instead of -it followed by a docker logs --follow myhttpd

[tianon]

Even just dropping "-t" should remove the sending of SIGWINCH when the window resizes.

[tianon]

I've filed docker-library/docs#669 to update the image description to avoid this issue.

[russau]

From the ASF Bugzilla - commenting here with the hopes it saves the next person debugging this some time!

You are correct that SIGWINCH is used to signal a windows size change to the applications running on a terminal. Due to the lack of other signal numbers and given the fact that httpd normally runs detached from a terminal the SIGWINCH signal was chosen to instruct httpd to do a graceful shutdown. So this works as designed.

https://bz.apache.org/bugzilla/show_bug.cgi?id=50669

[geoffreywiseman]

This happens all the time to me -- I run it in the foreground when I'm developing sometimes, although I guess I'm going to have to stop doing that. I'm not touching the terminal window, but for some reason, there's a lot of SIGWINCHes happening.