Herbert Poetzl <herbert@xxxxxxxxxxxx> writes: > > again, we basically support 3 different guest models > (regarding init) which probably can be best explained > with an example ... > > 1) blend through/fake init (from the host system) > > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > root 1 6.0 1.9 2036 1096 ? S 14:24 0:06 init > root 38 0.7 0.8 2832 448 ? S 14:26 0:00 sleep 1000 > root 43 50.0 1.2 2536 676 ? R 14:26 0:00 ps auxwww > > 2) a real init process (running inside the guest with pid=1) > > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > root 1 1.6 0.7 2832 444 ? S 14:26 0:00 sleep 1000 > root 44 0.0 1.2 2536 676 ? R 14:26 0:00 ps auxwww > > 3) no init process (inside a guest) > > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > root 42 0.4 0.7 2828 444 ? S 14:26 0:00 sleep 1000 > root 45 38.0 1.2 2536 676 ? R 14:26 0:00 ps auxwww > > > in cases 1) and 3) the 'first' process is in no > way special for the Guest, and must not be treated > special .. it can also go away anytime without > affecting the other guest processes ... > > case 2) could in theory handle the pid=1 process > (which might not be the first process, but usually > is a special init process) special, and it would > be acceptable to zap the context when this process > dies off ... > > note that the cases 1) and 2) are the most commonly > used cases as most init processes do not handle case > 3) yet. still case 3) is important for application > isolation too (which doesn't need any init) >From a maintenance standpoint options like this can be horrible. The practical question is this. For application isolation what problems have you encountered with running an application as pid == 1? Why do you need the no init process inside a guest case? If you can answer this question when it comes time to optimize things it will give us incentive to solve these cases. Eric _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
