Serge E. Hallyn wrote: > Hi Daniel, Hi Serge, > I know you've thought the whole console situation through > a great deal - and I haven't - so plz set me straight as > needed. > > liblxc supports 'lxc.pts', which tells it to mount a fresh > /dev/pts. However, it does this very late in the container > startup, and does not appear to support either lxc.tty consoles > or the 'main' console being in that ptsns. maybe I am misunderstanding but I think you should look at the 'lxc_create_console' and the 'setup_console' functions, that will show why new pts instance and console / tty are not correlated. > When I want to checkpoint and restart something which writes > to a container in a hand-built container, what I generally do > is start sshd and screen -dm in the container, ssh in, > screen -r, start my job, detach and logout, then do my > freeze/checkpoint/restart, and then i can ssh back in and > screen -r. > > That's obviously less than ideal :) I'd like to be able to > checkpoint lightweight containers by doing > > lxc-execute -n serge -- myscript > or maybe > lxc-start -d -n serge -- myscript > > and have the container init's fd 0-2 be /dev/pts/0 in the > container's devpts mount. > > For that to work, lxc-execute would have to mount its new > devpts instance, then open /dev/pts/0, and start up a proxy > to ferry the console info back and forth. I thought in the > past you'd talked about that, but I can't recall whether you > said you wanted to do it, or that you thought it was too > heavyweight :) lxc-start which runs system container does that if it is specified in the configuration. > Have you had any such thing in mind? lxc-execute is for running application containers and the *stdio* are inherited in the container. I suppose it may be possible to generalize the console, the ttys and the stdio. > The related feature of course woudl be for lxc-start with > lxc.tty=4 to first mount a new devpts instance, then run > getty on /dev/pts/[0-4] and let lxc-console attach to > those. I am a bit lost, what do you want to do ? Do you plan to make tty, console and stdio using the same mechanism and get rid of the actual bind mount of <rootfs>/dev/console|tty ? Can you elaborate a bit and send a draft-patch to illustrate your idea ? Thanks -- Daniel _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
