Hello, I'm trying to use DMTCP to save my user sessions on an online service that offers LXC virtual machines. The service shutdowns the container after 15 minutes of inactivity on my side, and I would like to be able to save my tmux session and all related processes to disk before that happens.
So, I've compiled DMTCP 2.0, and 40 out of 45 tests pass*. I figured that I may try to do something simple first, so I launch the coordinator in a terminal, and `bin/dmtcp_launch cat` in another. The coordinator notes that "NOTE at dmtcp_coordinator.cpp:1039 in onConnect; REASON='worker connected'". It all seems fine, and the clients list contains my cat. The problem comes when I actually make a checkpoint using 'c' in the coordinator. The coordinator goes through what seems to be a reasonable list of stages, from "starting checkpoint, suspending all nodes" to "restarting all nodes", but in the terminal where the dmtcp-monitored "cat" is running, there is an avalanche of errors that all look like: [11795] mtcp_writeckpt.c:718 write_ckpt_to_file: ERROR: error statting /var/lib/lxc/vm-524f2a6f88716f1d3800785a/overlay/home/agravier/dmtcp-2.0/plugin/ipc/libdmtcp_ipc.so : No such file or directory [11795] mtcp_writeckpt.c:718 write_ckpt_to_file: ERROR: error statting /var/lib/lxc/rootfs/lib/x86_64-linux-gnu/ld-2.17.so : No such file or directory And there are dozens of those. Visibly, mtcp is looking for files using their absolute path *outside* of the LXC container, which, of course, does not correspond to their paths inside of it. I would like to understand how LXC chroots in a way that still allows MTCP to get hold of the original filepaths. Why does MTCP get confused when other applications don't? Or rather, why it doesn't get confused by LXC :) ? Is there is anything that I might do about all that? Thanks and regards, Alexandre * Failing tests: shared-memory (rstr), pty2, bash (rstr), script, screen. ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users
