Basic Cinder (volume) service functionality in Openstack – Part1

In this post I am going to show you basic functionality of openstack cinder (volume) service functionality by creating volume on internal storage. Attaching that volume to VM. Create partition on that volume in client machine and test partition remove and detaching volume from VM.

Lets take one running state vm for cinder testing as we can do this operation on the fly. I have one VM name testvm.

Check the disk and partitions on the VM. I can access the testvm using private IP and public IP. Lets access it using private IP using unique network namespace.

First check private-net network ID and test the ping to private IP of VM using network namespace. For more details about basic networking in openstack check my last blog posts.

Now ssh to VM using cirros user as I have used cirros image for testvm.

now sudo to root to check disk details. cirros user does not have privileges to check the disk details.

We can see we have one disk vda and we have one partition /dev/vda1 on top of it.

Check whether cinder related services are up and running on controller node.

Check the command-line requirement for cinder volume create

Create a volume with 1GB in size and name test-vol-1

You can check the status of volume into cinder list. If you find that volume is in error state like following.

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Then check status of cinder-volume service.

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Also in service status log you can find couple of errors.i.e. WARNING cinder.volume.manager Update driver status failed: (config name lvm) is uninitialized.

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One of the reason for these issues are we might have sudoers permission issue in cinder sudoers file. Update the /etc/sudoers.d/cinder with following content.

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Also make sure you have correct volume group specified into cinder.conf file and that volume group is present on the server. Volume group also should have enough free space available to create new volumes.

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