In continuation to my previous articles on OpenStack Errors and Solutions for installation and configuration of KeyStone and Glance, today I’m going to share some errors that I encountered while installing and configuring Nova (Compute) service on controller node.
Most of these errors were encountered while listing the images via nova command, starting various nova services such as (nova-api, nova-metadata-api, nova-cert, nova-conductor, nova-console, nova-consoleauth, nova-scheduler etc…). The errors occurred while starting the nova services were bit tricky, it was mainly due to improper configurations and syntax errors.
Ok, Here’s the list of problems that I faced.
ERROR: (‘Connection aborted.’, error(111, ‘Connection refused’))
# nova image-list
ERROR: ('Connection aborted.', error(111, 'Connection refused'))Solution:
When I tried to image-list via nova, the connection refused error was thrown. This was primarily due to various reasons,
- Check if all the nova related services are running properly. For example, when you start any nova services as ‘service nova-api start‘, the command might return green status as “[OK]’. But actually the service might not have been started properly. Below is one example.
# /etc/init.d/openstack-nova-api start Starting openstack-nova-api: [ OK ]
# /etc/init.d/openstack-nova-api status openstack-nova-api dead but pid file exists
In above case, you should check the corresponding service log under /var/log/nova/api.log to know the exact error message.
In my case, none of the nova service were starting properly and I had to dig all of those service logs.
openstack-nova-api is running...
openstack-nova-cert is running...
openstack-nova-conductor is running...
openstack-nova-console is running...
openstack-nova-consoleauth is running...
openstack-nova-metadata-api is running
openstack-nova-novncproxy is running...
openstack-nova-scheduler is running...- Check if the firewall on the controller node is blocking the service ports.
Error : CRITICAL nova [-] RequiredOptError: value required for option: lock_path
The above error message was captured from /var/log/nova/api.log file and it was triggered when openstack-nova-api service failed to start.
Solution:
# vim /etc/nova/nova.conf
and uncomment ‘lock_path‘ : lock_path=/var/lib/nova/tmp. Save the file and start the service.
ERROR nova.openstack.common.
The above error message was logged in /var/log/nova/cert.log and it was triggered when ‘openstack-nova-cert‘ failed to start.
Solution:
# vim /etc/nova/nova.conf
and check if ‘ca_path‘ is pointing to the right directory and user ‘nova’ has permission to it.
Also Read: How to Fix OpenStack’s Keystone Authentication Error – HTTP 500?
ERROR nova.wsgi [-] Could not bind to 0.0.0.0:8775
CRITICAL nova [-] error: [Errno 98] Address already in use
# service openstack-nova-metadata-api status openstack-nova-metadata-api dead but pid file exists
And /var/log/nova/metadata-api.log reported the above error message.
Solution:
Surprisingly, the service ‘openstack-nova-metadata-api‘ was already running. Because, ‘openstack-nova-api‘ starts ‘metadata-api‘ service along with it and thus the service ‘metadata-api‘ fails to bind to the port. All you need to do is, check if ‘nova-api’ is configured to start ‘metadata-api’ along with it. To do that,
# vim /etc/nova/nova.conf and lookout for ‘enabled_apis = osapi_compute,
If you find metadata in enabled_apis, then whenever nova-api is started, it will also start metadata api.
In case, if you want to start nova-metadata-api individually, then remove metadata from ‘enabled_apis’.
'enabled_apis = osapi_compute'
# service openstack-nova-api start # service openstack-nova-metadata-api start
Now the service should start individually.
Error: compute driver option required but not specified
# service openstack-nova-compute status openstack-nova-compute dead but pid file exists
Solution:
#vim /etc/nova/nova.conf and set ‘compute_driver‘.
TRACE nova.openstack.common.
# service openstack-nova-compute status openstack-nova-compute dead but pid file exists
Solutions:
#vim /etc/nova/nova.conf and set ‘instances_path=/var/lib/
