Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx): > "Serge E. Hallyn" <serue@xxxxxxxxxx> writes: > > > We were talking this morning about what trivial patchset to begin > > with to get a start on checkpoint and restart. We thought that > > rather than start with checkpoint, maybe we should start with > > something that reads a "checkpoint file" and "restarts" a single > > task. In this case, restart means it sets the process id and > > executes the file which are found in the checkpoint file. > > > > So here's what we whipped up for a half hour this morning, > > and during some of Mark's talk this afternoon. > > > > It refuses to run if it isn't the container init, so you must > > unshare your pidns before calling sys_restore(). > > A reasonable approximation. > > Dave Hansen made a good point when he asked how do we graft a restored > checkpoint into the rest of the system. Requiring us to unshare > everything we intend to unshare before restore achieves this easily, > and you are following in that model. > > That leads to an interesting implication. We don't need to set the pid > of the first process. At most we can verify that the pid is the same. > If we have unshared the pid namespace the pid will be 1 and the needed > pid of the first process will be 1. > > More later. Good point. Sounds like our trivial prototype was still way over-featureful :) -serge _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
