Cant start an instance openstack

Question

I used devstack to setup openstack using ./stack.sh. I didn't add any files or change anything, everything is default. When I get on the dashboard and click launch on the included cirros image I get

Error: Failed to launch instance "test":
Please try again later [ Error: No valid host was found. ].

I've searched a lot of places for an answer and most of the answers involve checking my logs.

That brings me to my second question: I do not know why I don't have a /var/log/nova directory on my server. I'm new to systems administration and even newer to OpenStack. So i don't have much to add besides that.

What flavor is the instance you are trying to create? – Miguel Grinberg Sep 08 '14 at 14:33 — Miguel Grinberg, Sep 08 '14 at 14:33

score 1 · Answer 1 · answered Sep 20 '14 at 18:27

Devstack does not log to files, it creates a screen session that contains all the services, and each service logs to the console.

To access logs you need to get into your devstack directory and type this command:

$ ./rejoin-stack.sh

This will put you in a screen session. Now you can find the session for nova-compute and that will have your logs. To select a session type Ctrl+A and then " (the double-quote character). A list of sessions will be shown, from where you can select one. The nova-compute session I believe is called "n-cpu". To exit the screen session type Ctrl+A and then "d". There are a lot more things you can do in a screen session, look up the documentation for the screen utility for more information.

score 0 · Answer 2 · edited Dec 04 '14 at 11:31

0

Check if all openstack services are up, also you can start only nova services from following command:

cd /etc/int.d && for i in $( ls nova-*); do service $i restart; done

edited Dec 04 '14 at 11:31

Pawel

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answered Sep 15 '14 at 08:40

Muralidhar

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score 0 · Answer 3 · edited Dec 04 '14 at 12:17

Well I am not familiar with devstack deployments but for the Host Error.

First see if all services are running on not. Particularly nova:

openstack-service status

All services should be up and running.

Now second thing, run the following command on the compute nodes:

hostname

This should display hostname of the node.

Now run the following on controller node:

nova availability-zone-list

This should display all the hosts (by their hostnames) registered with OpenStack Nova. Particularly there might be some issue here with host details and I guess you are missing the details here.

If this is the case, then look for how to adding compute hosts in Openstack Nova in the manuals.

Cant start an instance openstack

3 Answers3