javed alam <[email protected]> wrote on 08/23/2014 02:39:38 PM:
> From: javed alam <[email protected]>
> To: openstack <[email protected]>, Masoom Alam
> <[email protected]>
> Date: 08/23/2014 02:49 PM
> Subject: [Openstack] Fwd: nova instance
>
> ...
> "Error: Failed to launch instance "nova_testing": Please try again
> later [Error: No valid host was found. ]. "
> ...
> i m even unable to find the log files.
Hi Javed,
the error "no valid host found" is thrown by the `nova-scheduler`
service (see [1] for details).
Depending on your testing environment you have to check different things:
1) An "All-In-One" DevStack[2] setup:
* check your `local.conf` file in your devstack folder. There should
be the following lines:
DEST=/opt/stack
LOGFILE=$DEST/logs/stack.sh.log
VERBOSE=True
SCREEN_LOGDIR=$DEST/logs/screen
* The log of the scheduler is then available at:
/opt/stack/logs/screen/screen-n-sch-log
* The scheduler log should contain more information about the cause
Afaik the changes will be applied when the services are restarted. You
can either execute the DevStack scripts `unstack.sh` and `stack.sh` or
use the screen tool (see [4]).
2) A dedicated controller node:
The default folder for nova logs is `/var/log/nova`. The scheduler log
should be there. Maybe you have to turn on debugging in the file
`/etc/nova/nova.conf` in the line `debug=true` and `verbose=true`.
More infos about working with logs can be found at [3].
Sources:
[1] OpenStack configuration reference; Juno Release (draft);
Section "Scheduling"
http://docs.openstack.org/trunk/config-reference/content/section_compute-scheduler.html
[2] DevStack; http://devstack.org/guides/single-machine.html
[3] OpenStack Cloud Administrator Guide; Section "Manage Logs";
http://docs.openstack.org/admin-guide-cloud/content/section_manage-logs.html
[4] IBM Developer Works; 2013-12-06; Restart services of devstack based
openstack;
https://www.ibm.com/developerworks/community/blogs/8160eff1-dedf-408e-9395-9dffeb68749f/entry/working_with_screens_to_restart_service_of_devstack_based_openstack?lang=en
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