From 8a0643979783876091b9bde9494afd9207012a2e Mon Sep 17 00:00:00 2001
From: Nicolai Ort <info@nicolai-ort.com>
Date: Mon, 21 Jul 2025 12:19:35 +0200
Subject: [PATCH] =?UTF-8?q?docs(day1):=20Metal=C2=B3=20Talk?=
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+---
+title: Bringing Cloud-Native Agility to Bare-Metal Kubernetes with Cluster API and Metal³
+weight: 5
+tags:
+ - capi
+ - baremetal
+---
+
+<!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
+<!-- {{% button href="https://docs.google.com/presentation/d/1nEK0CVC_yQgIDqwsdh-PRihB6dc9RyT-" style="tip" icon="person-chalkboard" %}}Slides{{% /button %}} -->
+
+
+Premise: We are in the **cloud native** era, not the **cloud* era -> We can do stuff onprem
+
+## Baseline
+
+- Baremetal is cool b/c: No overhead, no hypervisor license, direct scheduling access
+- But: Low provisioning, inflexible, needs drivers and so on
+- Cluster Provisioning can be done in many different ways, even kube-native with CAPI (yay)
+- CAPI is cool and can be used with many different infra providers
+
+> I wont repeat the idea behind CAPI here (which were the next 5-10min of the talk)
+
+## What about baremetal
+
+> Metal³ (MEtal-kubed) to the rescue
+
+```mermaid
+graph LR
+CAPI-->BareMetalOperator-->Ironic-->BMC("BMC (IPMI, etc)")
+```
+
+### Ironic
+
+- API: Expose actions
+- Conductor: Talk to MBC
+- Agent: Ramdisk for disk cleaning and all other initial local stuff
+- Inspector: Collect HWInfo
+- DB: Store state
+
+### Baremetal operator
+
+- Runs in management cluster and watched BaremetalHost CR
+- Can be used with or without CAPI
+- BaremetalHost controls stuff like: Firware, Power State, Raid, Boot mode, ...
+- HardwareData CRD contains information about the Host after it has been checked by Ironic Inspector
+
+TODO: Steal state flow chart from slides
+
+### Provisioning
+
+- Baseline: Host is in the Available state
+- Action: Assign a OS image with userdata to a host and specify the storage device (defaults to /dev/sda)
+- Reaction: Metal³ chooses a fitting baremetalhost to consume
+- Result: System boots into os image and initialized via ignition (userdata)
+
+## Observations/Other
+
+- Metal³ is pretty slow (due to hardware and ironic)
+- You need spare servers for rolling update -> You can reuse a existing server during upgrade via Recreate Update
+- We can controll some harware operations via node annotations like shutdown/reboot/maintainance