restart (mktree) program usage
sukadev at linux.vnet.ibm.com
Wed Sep 16 18:35:46 PDT 2009
Oren Laadan [orenl at librato.com] wrote:
| Sukadev Bhattiprolu wrote:
| > I have a usage question on the 'restart' (formerly mktree) program.
| > In the following container c/r case:
| > - create a container
| > - log in to the container,
| > - restore filesystem(s) from snapshot
| > - restart application from checkpoint
| FWIW, I'd expect that future versions of 'restart' will be capable
| of doing this entire setup, (filesystem(s) included), as it matures.
| Note that this use case that you suggest will only work to restart
| subtrees; it is unsuitable for full containers (with pids) because
| the pid of init (1) will already be in use.
True. But if originally the application was started as:
Login to contaienr
Set up filesystem
The application would not be using the pid 1 right - even if the
application was started from an rc script in the container ?
| Perhaps we should think of some "plugin" architecture for 'restart'
| that will allow the user to ask it to execute some work at between
| creating a new container and actually restarting into it ?
Yes, that would be really useful I think for things like restoring file
system to its snapshot. Without that there is somewhat of an assymetry
in starting an application in a container and restarting it from a
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