1. Error: Something went wrong! An unexpected error has occurred. Try refreshing the page. If that doesn't help, contact your local administrator.
service apache2 restart
service memcached restart
2. Error: If can't reach host to instance
nano /etc/neutron/dhcp_agent.ini
Search
isolated
enable_isolated_metadata = true
systemctl restart neutron-dhcp-agent
3. Error: When luanch a instance then show the error timeout
Show nova-compute.log
tail -f /var/log/nova/nova-compute.log
nano /etc/nova/nova.conf.d/100-nova.conf
block_device_allocate_retries = 300
block_device_allocate_retries_interval = 3
4. Error: OpenStack-Exceeded-Maximum-Number-Of-Retries-Exhausted-All-Hosts-Available-For-Retrying-Build-Failures-For-Instance.
tail -f /var/log/cinder/volume.log
tail -f /var/log/nova/nova-conductor.log
5. Error: NoValidHost: No valid host was found. There are not enough hosts available
Edit /etc/nova/nova.conf in all the compute node and modify as per your application requirement .
nano /etc/nova/nova.conf
Double of Physical Core can be used for total Instance
Double of Total Memory can be used for total Instance
cpu_allocation_ratio = 2.0
ram_allocation_ratio = 2.0
Restart Nova and Nova-Scheduler in all the Compute Node
systemctl restart openstack-nova-*
systemctl restart openstack-nova-scheduler.service