From: http://openstack.redhat.com/forum/discussion/952/problem-creating-instances-no-valid-host/p1
Check subnet availability. Also: No valid host means the scheduler was unable to find a compute host suitable for booting your new instance. A common cause of this is not enough memory on your compute nodes, so check that. Also make sure that your compute nodes have the brctl command available, which is necessary to set up networking for the instance -- if that command is missing, you will also see this error. To help identify the source of the problem, you'll want to make sure you have debug logging turned on (debug=True in /etc/nova/nova.conf) on both your controller and your compute node. Pay careful attention to the messages logged when an instance is booting; generally somewhere in there will be the source of the problem. Regards, Shariar Kazi On Sun, Aug 10, 2014 at 7:29 AM, Giles Cornelius Gomes < [email protected]> wrote: > I am getting following error while launching an instance from dashboard. > > > > *Error:* Failed to launch instance "devstack-havana": Please try again > later [Error: No valid host was found. ]. > > > > Please let me know the reason and remedy. > > > > Best regards, > > > > *Giles Cornelius Gomes* > > Database Administrator (Billing) > NovoTel Limited > House: Ga-30/G, Pragati Sarani > Shahjadpur, Gulshan-2 > Dhaka-1212, Bangladesh > > Tel: +880-2-8899657; Ext: 212 > Fax: +880-2-8899654 > Web: www.novotel-bd.com > > [image: Description: Description: Description: Description: > cid:[email protected]] > *Disclaimer: * > > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient, please contact the > sender by reply e-mail and destroy all copies and the original message. Any > unauthorized review, use, disclosure, dissemination, forwarding, printing > or copying of this e-mail or any action taken in reliance on this e-mail is > strictly prohibited and may be unlawful. > > > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : [email protected] > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >
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