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From: Jacques Gelinas (jack_at_solucorp.qc.ca)
Date: Tue 05 Nov 2002 - 19:50:38 GMT

On Tue, 5 Nov 2002 17:48:17 -0500, mark.lawrence_at_holcim.com wrote
> Hello,
> First up, is the mailing list still working? Maybe I am no longer
> subscribed because I haven't received anything today...
> 1) I have an idea with regards the current method of rebooting/halting
> virtual servers. Presently a virtual server must be modified (installation
> of the vreboot command) in order to be able to inform the root server that
> it should be rebooted. This requires the modification of init.d/rc.d
> scripts or knowledge by the vserver sysadmin plus an extra rebootmgr demon
> in the root server to listen for reboot requests. I think this can be
> simplified so that the behaviour is more streamlined/natural.

This is doable. I will put it on the todo list :-) patch accepted

> During a normal halt or reboot process, init or some rc script ends up
> executing /sbin/reboot which calls the reboot(2) system call. Currently
> this is ignored unless CAP_SYS_REBOOT is defined. I propose that instead
> of ignoring the reboot(2) call the kernel spawns a "vserver <context>
> stop|start|restart" in context 1. This way, the real /sbin/reboot can be
> called as normal without having to be replaced by vreboot, and we do away
> with the need for rebootmgr in the root server. Apart from the kernel
> change I think this would need the vserver script to handle a "restart"
> option and to take a context as an option as well as the virtual server
> name. Does this seem workable?
> 2) I also have a small patch for the /usr/sbin/vserver script. "running"
> and "status" both count how many processes are running by entering the
> security context:
> NB=`$CHCONTEXT_CMD --silent --ctx $S_CONTEXT ps ax | wc -l`
> NB=`eval expr $NB + 0`
> This is inaccurate in the case of the "status" command because we have
> added three processes to the context just to make the measurement. It also
> fails on the "running" case when there is only one process left (ie after
> doing a "init 0" in a fakeinit server for example). What I suggest is that
> the above is replaced with:
> NB=$(vps ax | awk '{print $2}' | grep $S_CONTEXT | wc -l)
> which is more accurate.

Good. I have modified vserver with this. Will be in 0.22 early next week.


Jacques Gelinas <jack_at_solucorp.qc.ca>
vserver: run general purpose virtual servers on one box, full speed!

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