Attach Cinder Volume to the Ironic Instance without Nova

OpenStack Cinder provides an API to attach/detach volume to Nova instances. This is public, but not documented API which is used only by Nova now.  In scope of “Attach/detach volumes without Nova” [1] blueprint we introduce new python-cinderclient extension to provide attach/detach API not only for Nova called python-brick-cinderclient-ext. Before Mitaka release everybody who want to use Cinder volumes not only with Nova instances have to create hardening scripts based on python-cinderclient and os-brick [3] projects to make it done.

Since Mitaka, Cinder opens attach/detach API for any users. It will allow to:

 

  • Attach volume to Ironic instance
  • Attach volume to any virtual/baremetal host which is not provisioned by Nova or Ironic

 

It means, Cinder becomes stand-alone project that could be used outside OpenStack cloud with one limitation: Keystone is still required.

For now, python-brick-cinderclient-ext has only ‘get-connector’ API. Attach/detach features are under development and any feedback are welcome to get implemented in the best way. I hope, it will be implemented and documented as well in scope of Mitaka release cycle.

I will show you how it works in current proof-of-concept code [4]. Anybody is welcome to review and test it:).

To demonstrate this feature I will use virtual Devstack environment with Ironic+Cinder. Here is my local.conf [5].

Current limitations are:

 

  • Ironic instance must have access to API and storage networks (it works on Devstack with a default configuration
  • Users inside instance must have root permissions and be able to install required software

 

Detailed manual how to setup Ironic using Devstack could be found here [6]. Since volumes attach/detach operations require python, open-iscsi, udev and other packages I will use Ubuntu-based image for Ironic instances. You can use Ubuntu cloud image [7] or build your own using ‘disk-image-builder’ tool [8]. I’ve built my Ubuntu image with disk-image-builder:

After it we need to run Ironic instance:

Wait until instance is booted and ready [9]:

Now you can connect to the instance using SSH:

By default, in Devstack both Nova and Ironic instances have access to OpenStack APIs.

To attach volume you need to install required packages inside you instance:

NOTE: if you can’t acces Internet inside your instance, try the following command on the DevStack host:

Clone and install the latest python-cinderclient (the latests version from PyPi will also work but you’ll need to pass –os-volume-api-version explicit):

Clone the python-brick-cinderclient-ext and apply the patch:

That’s all! Now, you can attach/detach volumes inside your instance. Because it is still PoC implementation you need few additional steps:

The steps above is needed until python-brick-cinderclient-ext will use oslo.rootwrap or privsep libraries.

Verify, that python-brick-cinderclient-ext works well 10:

You should get something this: [11].

Finally, create and attach volume to your Ironic instance:

You should get something like: [12]

Now you can verify that volume is attached via iSCSI protocol [13]:

Detach is also easy:

That’s all! You’ve got attached your Cinder volume to an Ironic instance without Nova! You can do the same steps to attach volumes inside Nova instance or your desktop. It will work too. I will show you a demo with Nova instance and cloud config scrips in the next post.

 

[1] https://github.com/openstack/cinder-specs/blob/master/specs/mitaka/use-cinder-without-nova.rst
[2] https://github.com/openstack/python-brick-cinderclient-ext
[3] https://github.com/openstack/os-brick
[4] https://review.openstack.org/263744
[5] https://gist.github.com/e0ne/2579921aba839322decc
[6] http://docs.openstack.org/developer/ironic/dev/dev-quickstart.html#deploying-ironic-with-devstack
[7] https://cloud-images.ubuntu.com/
[8] http://docs.openstack.org/developer/ironic/deploy/install-guide.html#image-requirements
[9] http://paste.openstack.org/show/483734/
[11] http://paste.openstack.org/show/483742/
[12] http://paste.openstack.org/show/483743/

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