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<!-- | ||
This work is licensed under a Creative Commons Attribution 3.0 | ||
Unported License. | ||
http://creativecommons.org/licenses/by/3.0/legalcode | ||
--> | ||
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# Update Firmware of BMHs | ||
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## Status | ||
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implementable | ||
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## Summary | ||
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This design document describes a Metal3 API for using the Firmware Interface | ||
feature added to Ironic, this will allow updates of firmware of bmc and bios | ||
in BMH that are compatible with Redfish. | ||
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## Motivation | ||
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When provisioning new machines to clusters, it may be necessary to upgrade | ||
or downgrade the servers BIOS and firmware to specific versions to ensure | ||
the server is configured as it is in their validated pattern. | ||
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Redfish has a common API that allow users to execute a firmware update, the | ||
[proposal](https://specs.openstack.org/openstack/ironic-specs/priorities/2023-2-workitems.html#firmware-updates) | ||
was accepted in the Ironic community, and is already implemented. | ||
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### Goals | ||
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This proposal does not attempt to fulfill the following goals: | ||
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- Allow firmware updates for the BMC and BIOS in hardware only compatible | ||
with Redfish. | ||
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### Non-Goals | ||
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- Update firmware using non Redfish means | ||
- Update firmware that are not for BMC and BIOS | ||
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## Proposal | ||
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### User Stories | ||
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#### Story 1 | ||
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As an operator I want to install specific versions of firmware in my | ||
machines before installing the Operating System. | ||
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## Design Details | ||
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This proposes a new Custom Resource Definition (CRD) to store the information | ||
about the firmware components from Ironic. The initial version stores only | ||
the firmware information about BMC and BIOS, we may expand this to other | ||
components in the future. | ||
The new CRD is named `HostFirmwareComponents` and will consist of the | ||
following: | ||
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- `components` - the current firmware components and their information, | ||
retrieved from Ironic via the [Firmware API](https://docs.openstack.org/api-ref/baremetal/#node-firmware-nodes) | ||
will be stored in the `Status` section. | ||
- `updates` - firmware components to be updated via Ironic will be | ||
stored in the `Spec` section. It will be empty when the CRD is created. | ||
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The firmware components are retrieved from the BMC by Ironic and cached | ||
whenever the node moves to `manageable` or `cleaning`, or when the components | ||
are updated. The BMO manages the data as follows: | ||
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- The node first transitions to manageable during the `Registering` state, so | ||
at the end of that state `components` will be populated. | ||
- Firmware components can be updated during the `Preparing` state, so at the | ||
end of that state the components will also be retrieved and used to update | ||
`components`. | ||
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A user can update `updates` to specify the desired firmware of each | ||
component. The BMO will detect changes on it by comparing the name/url pairs | ||
to the values in `Status`. When a change is detected, the BMO will add the | ||
new values to the Ironic clean-steps API in the Preparing state, when building | ||
the manual clean steps, the Host will re-enter this state from Ready/Available | ||
state whenever its config differs from the last stored one. | ||
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After executing the cleaning, Ironic will re-read the information about the | ||
firmware components and cache them, the new information can be retrieved by | ||
the BMO and used to update `components`. | ||
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If the update fails we won’t keep trying to reconcile, the BMO will put the | ||
node in a `Error` state. We will allow deletion of the BMH when in this state. | ||
When in `Error` state, the BMH can be moved to `Preparing` state again, this | ||
can be done by updating the HostFirmwareComponent CRD, triggering another | ||
manual cleaning that will execute a new firmware update. | ||
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### Implementation Details/Notes/Constraints | ||
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Each Host should have their own `HostFirmwareComponents` CRD. | ||
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An example of the resource before applying: | ||
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```yaml | ||
--- | ||
apiVersion: metal3.io/v1alpha1 | ||
kind: HostFirmwareComponents | ||
metadata: | ||
namespace: host3firmwarecomponents.metal3.io | ||
spec: | ||
updates: | ||
- name: bios | ||
url: https://myurl.with.firmware.for.bios | ||
wait: 200 | ||
- name: bmc | ||
url: https://myurl.with.firmware.for.bmc | ||
wait: 300 | ||
status: | ||
components: | ||
- component: bios | ||
initialVersion: "v1.0.0" | ||
currentVersion: "v1.0.0" | ||
lastVersionFlashed: null | ||
createdAt: "2023-10-13T13:34:06Z" | ||
updatedAt: null | ||
- component: bmc | ||
initialVersion: "v1.0.5" | ||
currentVersion: "v1.0.5" | ||
lastVersionFlashed: null | ||
createdAt: "2023-10-13T13:34:06Z" | ||
updatedAt: null | ||
lastUpdated: "2023-10-13T13:34:06Z" | ||
``` | ||
Example of the Resource after applied: | ||
```yaml | ||
--- | ||
apiVersion: metal3.io/v1alpha1 | ||
kind: HostFirmwareComponents | ||
metadata: | ||
namespace: host3firmwarecomponents.metal3.io | ||
spec: | ||
updates: | ||
- name: bios | ||
url: https://myurl.with.firmware.for.bios | ||
wait: 200 | ||
- name: bmc | ||
url: https://myurl.with.firmware.for.bmc | ||
wait: 300 | ||
status: | ||
components: | ||
- component: bios | ||
initialVersion: "v1.0.0" | ||
currentVersion: "v1.5.0" | ||
lastVersionFlashed: "v.1.5.0" | ||
createdAt: "2023-10-13T13:34:06Z" | ||
updatedAt: "2023-10-13T13:50:06Z" | ||
- component: bmc | ||
initialVersion: "v1.0.5" | ||
currentVersion: "v1.2.0" | ||
lastVersionFlashed: "v1.2.0" | ||
createdAt: "2023-10-13T13:34:06Z" | ||
updatedAt: "2023-10-13T13:50:06Z" | ||
updates: | ||
- name: bios | ||
url: https://myurl.with.firmware.for.bios | ||
wait: 200 | ||
- name: bmc | ||
url: https://myurl.with.firmware.for.bmc | ||
wait: 300 | ||
lastUpdated: "2023-10-13T13:50:06Z" | ||
``` | ||
### Risks and Mitigations | ||
- In case of failure when executing the firmware update, BMO will put the BMH | ||
in a failed state. | ||
- New firmware may have fixed a few bugs, but it can also introduce new ones. | ||
We will try to mitigate this by providing some versions of tested firmware | ||
when possible. | ||
### Work Items | ||
BMO | ||
- Add new CRD for `HostFirmwareComponents` | ||
- Get the firmware information from Ironic API at the end of the Registration | ||
state and store all the information in the `components` | ||
- Check for changes to `updates` and when detected, call the Ironic | ||
clean-steps API | ||
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### Dependencies | ||
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- Ironic (support already exists) | ||
- Gophercloud (support already exists) | ||
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### Test Plan | ||
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- Test on running cluster | ||
- Verify that updates can be executed on two type of hardware that supports | ||
Redfish. | ||
- Verify that the information about the desired version is available after | ||
cleaning. | ||
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### Upgrade / Downgrade Strategy | ||
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Not required as this is a new API being introduced | ||
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### Version Skew Strategy | ||
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None | ||
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## Drawbacks | ||
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Recovering from a failure may be quite difficult, at least through Metal3 means only. | ||
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## Alternatives | ||
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Operators can do the updates manually. | ||
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## References | ||
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- [Firmware Interface](https://review.opendev.org/c/openstack/ironic-specs/+/878505) | ||
- [Firmware Interface API reference](https://docs.openstack.org/api-ref/baremetal/#node-firmware-nodes) | ||
- [Gophercloud Support](https://github.com/gophercloud/gophercloud/pull/2795) | ||
- [Metal3 Ironic Image](https://github.com/metal3-io/ironic-image/pull/438) |