<div dir="ltr"><div>From:</div><div><br></div><a href="http://openstack.redhat.com/forum/discussion/952/problem-creating-instances-no-valid-host/p1">http://openstack.redhat.com/forum/discussion/952/problem-creating-instances-no-valid-host/p1</a><div>
<br></div><div>Check subnet availability. Also:<br><div><br></div><div><p style="margin:8px 0px;padding:0px;outline:0px;font-size:14px;vertical-align:baseline;line-height:1.6em;color:rgb(51,51,51);font-family:Lato,sans-serif">
<code style="margin:0px;padding:2px 4px;outline:0px;font-style:inherit;font-size:12px;vertical-align:baseline;white-space:nowrap;overflow:auto;font-family:Monaco,Menlo,Consolas,'Courier New',monospace;color:rgb(221,17,68);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;border:1px solid rgb(225,225,232);background-color:rgb(247,247,249)">No valid host</code> 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 <code style="margin:0px;padding:2px 4px;outline:0px;font-style:inherit;font-size:12px;vertical-align:baseline;white-space:nowrap;overflow:auto;font-family:Monaco,Menlo,Consolas,'Courier New',monospace;color:rgb(221,17,68);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;border:1px solid rgb(225,225,232);background-color:rgb(247,247,249)">brctl</code> command available, which is necessary to set up networking for the instance -- if that command is missing, you will also see this error.</p>
<p style="margin:8px 0px;padding:0px;outline:0px;font-size:14px;vertical-align:baseline;line-height:1.6em;color:rgb(51,51,51);font-family:Lato,sans-serif">To help identify the source of the problem, you'll want to make sure you have debug logging turned on (<code style="margin:0px;padding:2px 4px;outline:0px;font-style:inherit;font-size:12px;vertical-align:baseline;white-space:nowrap;overflow:auto;font-family:Monaco,Menlo,Consolas,'Courier New',monospace;color:rgb(221,17,68);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;border:1px solid rgb(225,225,232);background-color:rgb(247,247,249)">debug=True</code> in <code style="margin:0px;padding:2px 4px;outline:0px;font-style:inherit;font-size:12px;vertical-align:baseline;white-space:nowrap;overflow:auto;font-family:Monaco,Menlo,Consolas,'Courier New',monospace;color:rgb(221,17,68);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;border:1px solid rgb(225,225,232);background-color:rgb(247,247,249)">/etc/nova/nova.conf</code>) 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.</p>
<p style="margin:8px 0px;padding:0px;outline:0px;font-size:14px;vertical-align:baseline;line-height:1.6em;color:rgb(51,51,51);font-family:Lato,sans-serif"><br></p><p style="margin:8px 0px;padding:0px;outline:0px;font-size:14px;vertical-align:baseline;line-height:1.6em;color:rgb(51,51,51);font-family:Lato,sans-serif">
<br></p></div></div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><br></div>Regards,<div><br></div><div>Shariar Kazi</div></div></div>
<br><br><div class="gmail_quote">On Sun, Aug 10, 2014 at 7:29 AM, Giles Cornelius Gomes <span dir="ltr"><<a href="mailto:Giles.Cornelius@novotel-bd.com" target="_blank">Giles.Cornelius@novotel-bd.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal">I am getting following error while launching an instance from dashboard.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><strong><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#b94a48;background:#f2dede">Error:</span></strong><span><b><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#b94a48;background:#f2dede"> </span></b></span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#b94a48;background:#f2dede">Failed to launch instance "devstack-havana": Please try again later [Error: No valid host was found. ].<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#b94a48;background:#f2dede"><u></u> <u></u></span></p><p class="MsoNormal">Please let me know the reason and remedy.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="color:black">Best regards,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:black"> <u></u><u></u></span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">Giles Cornelius Gomes</span></b><span style="color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Database Administrator (Billing)<br>NovoTel Limited<br>House: Ga-30/G, Pragati Sarani<br>Shahjadpur, Gulshan-2<br>Dhaka-1212, Bangladesh<br><br>Tel: +880-2-8899657; Ext: 212<br>
Fax: +880-2-8899654<br>Web: </span><span style="color:black"><a href="http://www.novotel-bd.com/" target="_blank"><span style="font-size:10.0pt;color:blue">www.novotel-bd.com</span></a><u></u><u></u></span></p><p class="MsoNormal">
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