On 25/05/12 11:28, Ward, David - 0663 - MITLL wrote:
On 25/05/12 10:40, Christian Seiler wrote:Hi,my lxc management script uses lxc-stop just for an emergency action called "fored-stop" and it will be also applied, if a normal "stop" (alias "halt") action will timeout after 5min. For this normal shutdown (or reboot) of a container, I'm sending just a SIGPWR (or SIGINT) to the containers init (sysvinit) process. This will result into the same actions as one will call 'poweroff' or 'reboot' inside it.Yes, obviously that also works, but then you need to manually update the inittab of a container and rewire reboot/power failure actions to cause a shutdown as you describe. I'd really prefer shutting down a container just worked out of the box without any strange modifications to /etc/inittab for sysvinit. I really think shutting down containers properly is a functionality that LXC should support out of the box.Actually I believe the burden here ought to be on the container to handle SIGPWR properly...not on lxc to get involved in dealing with subtleties between different init systems that might be running in a container. (And yes, upstart handles SIGPWR with the 'power-status-changed' event: see http://upstart.ubuntu.com/cookbook/upstart_cookbook.pdf ) If existing distros don't handle SIGPWR, then why don't we just modify the lxc-template so that it does? Or even fix the distro itself so that it does? David
To be clear, all I'm saying is that there should be a standard interface to shutting down containers (and it seems that others have settled on SIGPWR) -- lxc doesn't need to guess what is running inside it. But I agree that we should still modify lxc-stop to actually use this interface.
-- David Ward, Associate Staff Wideband Tactical Networking Group MIT Lincoln Laboratory Office: 781-981-4266 Mobile: 781-999-1925 Fax: 781-981-4583
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