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On 05/12/2014 22:35, Tony Breeds wrote: > Hi All, Openstcak (Nova) has had an issue for a longish time where > a running instance (qemu via libvirt) which has a file based > console can fill the disk of the hypervisor causing all guests to > stall. > > I'm looking at ways to fix this. Clearly it can be done in > openstack wothout changing qemu but it seems to be that a better > idea would be to teach qemu to reopen() these files when it > recieves a sighup and/or something in the monitor. > > I like the idea of sighup as it allows systems administrators to > use logrotate thereby avoiding baking policy into qemu. > > My initial thoughts are that I'd need to add a flag to the chardev > (perhaps allowreopen?) and upon reciept of the reopen request I'd I > iterate over the open chardevs and reopen them if they have this > flag set. > > The main target of this would be a console log. > > So my main question is would that be something that would be > considered for 2.3.0? If so any high level design points I shoudl > consider? > > - Is the chardev flag a good/bad idea? - Is it okay to change the > action taken by sighup? I think so. Should it reopen stdout/stderr too? If you want to make it optional, you can add a suboption to -msg. Paolo
