---------- Forwarded message ---------- From: Aryeh Friedman <aryeh.fried...@gmail.com> Date: Thu, Feb 6, 2014 at 7:55 AM Subject: Re: [Openstack] Error while booting VM To: "Narayanan, Krishnaprasad" <naray...@uni-mainz.de>
On Thu, Feb 6, 2014 at 7:19 AM, Narayanan, Krishnaprasad < naray...@uni-mainz.de> wrote: > Hallo all, > > > > Can I seek help for the problem described below? > > > > I have a VM running Ubuntu 12.04 in my OpenStack cloud and when it boots, > I get an error message that says "Error: invalid magic number, error: You > need to load the kernel first. Press any key to continue". > Was the host also rebooted or just the instance? The last time I attempted to do the first (Grizzly not Havana) it turned out to be *IMPOSSIBLE* (after 6 weeks of writing handwritten scripts for setting the stack up [eventually replicating devstack])... it is important to know one of the design assumptions built into openstack is that it is running in a data center which has such amenities as guaranteed power [the host will never be forced to reboot]... as a result of this the default disk cache mode used on most hypervisiors is known to provide good performance but at the cost of being protected against a power failure... so odds are the instance got "munched" by a incomplete write to the physical disk before the "power" went out on reboot... if you did not reboot the host ignore the above Note that if your face frequent such reboots due to the host needing to be powered cycled it might make sense to look into a 100% free open source (and open knowledge) tool such as PetiteCloud which is designed to insulate openstack as much as possible from the fact it does not have guaranteed power and add other stability and robustness functionality. PetiteCloud is currently only designed for very small clouds (no more then 5 to 10 hosts). -- Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org -- Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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