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  3. OpenStack Compute Error – No compute node record for host [Solved]

OpenStack Compute Error – No compute node record for host [Solved]

OpenStack compute Error: Though the compute hosts had nova-compute service listening, those nodes were not displayed when ‘nova hypervisor-list‘ command was executed.

# nova hypervisor-list
+----+----------------------------+-------+---------+
| ID | Hypervisor hostname | State | Status |
+----+----------------------------+-------+---------+

But the command nova service-list didn’t have any problem in displaying the compute hosts. Well, the issue might sound little strange, but if you are stuck with a similar problem in OpenStack, then here’s the solution.

Solution:

How to fix OpenStack Compute Error – No compute node record for host?

openstack compute error

Step 1: Since the compute hosts are not listed, the issue is related to nova-compute service. So I started to debug the issue right from the logs of nova @ compute nodes.

[compute-node]# cd /var/log/nova
[compute-node]# tailf nova-compute.log

Sample output:

ERROR nova.compute.manager [req-1d2c4e83-a57d-4e66-b8b4-81da4772b0d2 - - - - -] No compute node record for host cloudsecurity5
 INFO nova.compute.resource_tracker [req-1d2c4e83-a57d-4e66-b8b4-81da4772b0d2 - - - - -] Auditing locally available compute resources for node cloudsecurity5
 ERROR nova.compute.manager [req-1d2c4e83-a57d-4e66-b8b4-81da4772b0d2 - - - - -] Error updating resources for node cloudsecurity5

The above error indicates that the OpenStack scheduler is not able to find suitable compute host – probably due to invalid hypervisor or nova-compute service is not up or other configuration issue.

Step 2: Verify the configurations of Nova Compute

[compute-node]# vim /etc/nova-compute.conf

and look out for the below entries under [DEFAULT] section.

 [DEFAULT]
 compute_driver=libvirt.LibvirtDriver
 [libvirt]
 virt_type=kvm

Also ensure /etc/nova/nova.conf has all necessary configurations to run a compute host.

The central part of nova-compute service is the virtualization driver that interface with hypervisor. OpenStack supports many compute drivers such as libvirt.LibvirtDriver for KVM , xenapi.XenAPIDriver for Xen, vmwareapi.VMwareVCDriver for VMware and hyperv.HyperVDrive for HyperV. In my case, I was using libvirt compute driver (lookout for compute_driver attribute in the above snapshot).

Step 3: Ensure libvirt daemon is running.

[compute-node]# /etc/init.d/libvirt-bin status

Fortunately, the service libvirt-bin was active, but I did saw few errors at the end of the status output as shown below:

cloudsecurity5 libvirtd[58988]: hostname: cloudsecurity5.test.in
 cloudsecurity5 libvirtd[58988]: End of file while reading data: Input/output error

Though libvirt-bin daemon was running, it still indicates an issue while performing an Input/Output operations.

Hence, I decided to restart libvirt-bin and its related daemon called libvirt-guests.

[compute-node]# /etc/init.d/libvirt-guests restart
[compute-node]# /etc/init.d/libvirt-bin restart

Once done, confirm if the daemon is running without any error.

[compute-node]# /etc/init.d/libvirt-bin status

Sample output at the end of the service status message:

cloudsecurity2 systemd[1]: Starting Virtualization daemon...
 cloudsecurity2 systemd[1]: Started Virtualization daemon.
 cloudsecurity2 dnsmasq[2960]: read /etc/hosts - 9 addresses
 cloudsecurity2 dnsmasq[2960]: read /var/lib/libvirt/dnsmasq/def
 cloudsecurity2 dnsmasq-dhcp[2960]: read /var/lib/libvirt/dnsmas

Step 4: Restart nova-compute service as well.

[compute-node]# /etc/init.d/nova-compute restart

In my case, libvirt daemon’s Input/Output error was the culprit. The issue is solved and now the compute nodes are registered properly as shown below:

# nova hypervisor-list
 +----+----------------------------+-------+---------+
 | ID | Hypervisor hostname | State | Status |
 +----+----------------------------+-------+---------+
 | 1 | cloudsecurity5.test.in | up | enabled |
 +----+----------------------------+-------+---------+

 


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Updated on September 2, 2017

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