Open Stack

thanks Sam

What’s the 100,000 foot view of how ironic manages the configuration of a baremetal server when it is booting an end-user’s OS image ?

e.g. my best guess so far from looking at ironic documentation


·         ironic first deploys the ironic-python-agent to the server

o    ironic-python-agent

§  cleans up the bare metal server, e.g. wiping non-root disks, etc

§  performs inventory of bare metal server’s resources ... disks, NICs, memory, cpu, etc., and
reports this back to ironic conductor

·         ??? ironic builds up some sort of ‘config drive’  containing configuration of the bare metal server based on
ironic launch parameters (flavor, attached networks, etc.) and the discovered inventory ???

·         ??? ironic conductors DHCP/Boot Server somehow attaches the ‘config drive’ to the end-user OS as part of the
network booting ???

·         ??? the end-user OS boots ... and thru some standard mechanism uses the ‘config drive’ to configure the bare metal
server as desired by ironic ???

Greg.


From: "Sam Betts (sambetts)" <sambetts at cisco.com>
Reply-To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Date: Monday, July 24, 2017 at 12:26 PM
To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [ironic] Looking for a good end-to-end demo of ironic integrated within openstack

Hey Greg,

The Ironic deploy agent images are ramdisk images which include the ironic-python-agent https://docs.openstack.org/ironic-python-agent/latest/ Which is a tool build by the ironic team and used by ironic to deploy and cleanup the baremetal nodes.

The cirros images are just the default images loaded by devstack, I believe by default it downloads them from the cirros http://download.cirros-cloud.net

Sam

On 24/07/2017, 17:07, "Waines, Greg" <Greg.Waines at windriver.com<mailto:Greg.Waines at windriver.com>> wrote:

Hey Lucas,

Thanks for the pointer to this ironic devstack setup using VMs as baremetal servers.
I was able to follow the recipe and get this working and play with ironic.

Of course I’ve got some follow up questions.


Questions on the images:
stack at devstack-ironic:~/devstack$ glance image-list
+--------------------------------------+------------------------------------+
| ID                                   | Name                               |
+--------------------------------------+------------------------------------+
| 8091821f-a731-409c-a2fe-8986be444937 | cirros-0.3.5-x86_64-disk           |
| 087602b0-32b8-4b0d-823d-e3880614368f | cirros-0.3.5-x86_64-uec            |
| 44bda48e-e1a2-4680-9067-ceb5a3b0d150 | cirros-0.3.5-x86_64-uec-kernel     |
| 2027800b-4310-4bdc-a003-d4925e116f47 | cirros-0.3.5-x86_64-uec-ramdisk    |
| a47a03ca-e504-4f3a-a464-3a4815b89709 | ir-deploy-agent_ipmitool.initramfs |
| 8ae53801-de05-44e6-88d4-0e04738da9b7 | ir-deploy-agent_ipmitool.kernel    |
+--------------------------------------+------------------------------------+
stack at devstack-ironic:~/devstack$


·         so ‘cirros-0.3.5-x86_64-disk’ is the normal typical default cirros image for VMs in devstack

·         the ironic devstack config/setup must have setup these other images,
QUESTIONS:

o   how were the ‘cirros-0.3.5-x86_64-uec...’ images created ?

§  were they generated from cirros-0.3.5-x86_64-disk image using glance or an external tool ?

·         e.g. https://docs.openstack.org/diskimage-builder/latest/  ???

§  or

§  were they downloaded from some cirros distribution site ?





o   the ‘ir-deploy-agent_ipmitool.initramfs/kernel’ images

§  what is the role of these images ?

§  (feel free to point me to a description of this in ironic documentation)

§  e.g.

·         is it specific to the “test” environment of using VMs as fake bare metal servers ?

·         is this image generic regardless of specific end-user image (cirros, ubuntu, centos, ...) being put on the bare metal server ?

·         is this image being used for preparing / cleaning the bare metal server (e.g. wiping non-root disks, etc) ...
prior to putting on the end-user image ?


Greg.



From: Lucas Alvares Gomes <lucasagomes at gmail.com>
Reply-To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Date: Thursday, July 20, 2017 at 10:52 AM
To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [ironic] Looking for a good end-to-end demo of ironic integrated within openstack

Hi Greg,

> I’m an ironic newbie ...
>

First of, welcome to the community (-:

> where can I find a good / relatively-current (e.g. PIKE) demo of Ironic
> integrated within OpenStack ?
>

I would recommend deploying it with DevStack on a VM and playing with it, you can follow this document in order to do it: https://docs.openstack.org/ironic/latest/contributor/dev-quickstart.html#deploying-ironic-with-devstack

Hope that helps,
Lucas
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