Check your scheduler logs you should be able to figure out whats happening.
If not clear then turn on your logs from info mode to debug in nova.conf.


On Tue, Sep 9, 2014 at 12:10 AM, Sharan Kumar M <
> wrote:

> Hi,
> I am trying to setup my own OpenStack cloud for development. I installed
> DevStack on a VM and the installation is fine. I am able to log in via
> Horizon. I followed these steps to create an instance via Horizon.
> However, when I launch an
> instance, I get the following error.
> Failed to launch instance "nova": Please try again later [Error: No valid
> host was found. ]
> I checked if the libvirt_type=qemu in nova.conf. Also the package
> nova-compute-qemu is installed. I am using Ubuntu 14.04.
> Can someone identify why this problem occurs and how to solve it? What are
> the possible causes for this problem?
> Thanks,
> Sharan Kumar M
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