From 4cec1917bfd90cf3026430d226f4844152b3458e Mon Sep 17 00:00:00 2001
From: Nicolai Ort <info@nicolai-ort.com>
Date: Wed, 2 Apr 2025 13:17:43 +0200
Subject: [PATCH] docs(day1): Added migration talk

---
 content/day1/01_scaling-gpu.md |  1 +
 content/day1/02_migrations.md  | 75 ++++++++++++++++++++++++++++++++++
 content/day1/_index.md         |  6 ++-
 3 files changed, 80 insertions(+), 2 deletions(-)
 create mode 100644 content/day1/02_migrations.md

diff --git a/content/day1/01_scaling-gpu.md b/content/day1/01_scaling-gpu.md
index fab9b41..9f14ec0 100644
--- a/content/day1/01_scaling-gpu.md
+++ b/content/day1/01_scaling-gpu.md
@@ -7,6 +7,7 @@ tags:
  - ai
  - apiserver
  - go
+ - kubecon
 ---
 
 <!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
diff --git a/content/day1/02_migrations.md b/content/day1/02_migrations.md
new file mode 100644
index 0000000..880a6ef
--- /dev/null
+++ b/content/day1/02_migrations.md
@@ -0,0 +1,75 @@
+---
+title: Day 2000 - Migrating from kubeadm + ansible to clusterapi+talos
+weight: 2
+tags:
+ - kubecon
+ - platform
+---
+
+<!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
+
+## Background
+
+- They use large, shared clusters
+- The oldest cluster is 2099 days (5,8 years) old
+- Onprem hosted on vSphere with vanilla kubeadm
+- Fun fact: They run chaosmonkey on all clusters -> Automaticly prepares for updates
+
+### Legacy provisioning
+
+1. Terraform create debian vm
+2. Deploy base tools with puppet
+3. Register nodes in inventory yaml file
+4. run ansible playbook -> Renders configs and runs kubeadm
+5. Configure ArgoCD
+
+### Target
+
+- Use Clusterapi to manage the workload-clusters
+    - Basic CRDS: Cluster, MachineDeployment, Machine
+- Talos: Immutable, minimal, ephemeral with declarative config via grpc api
+
+TODO: Steal diagrams from slides
+
+
+## Migration
+
+1. Config matching between kubeadm and talos+capi
+2. Import PKI/Certs
+3. Create ClusterAPI CRDs
+4. Add ClusterAPI Nodes
+5. Remove kubeadm nodes
+
+### 1. Config matching
+
+1. Serviceaccount Issuer: Talos has it's own default
+2. etcd encryption key names are hardcoded in talos
+3. Re-Encrypt all secrets (get secrets, replace secrets)
+
+### 2. PKI
+
+1. Talos includes some logic that can generate a secrets bundle from an existing API
+2. Import: The etcd, k8s, serviceaccount and os (talos specific, used for the talos api auth) certificates
+
+### 3. CRDs
+
+- One namespace per workload cluster
+- Cluster-CRD: Ref to CP and Infrastructure
+- ControlPlane-CRD: Create cp MDs
+- Infrastructure: References template for wokrer-MDs
+
+TODO: Steal image
+
+### 4. Add ClusterAPI Nodes
+
+- Add new CP and Worker Nodes to the cluster that are managed by CAPI (slowly, stuff will break)
+- Remove the old nodes one by one over weeks ore months
+- Potential Problems:
+    - Mismatched serviceaccountissuer
+    - Missing etcd encryption key
+    - Wrong etcd encryption key
+    - Loss of quorum: `--force-new-cluster` can force recovery on one node of the etcd cluster
+
+## Demo
+
+I reccomend watching the demo
\ No newline at end of file
diff --git a/content/day1/_index.md b/content/day1/_index.md
index 15bfc9b..c504db2 100644
--- a/content/day1/_index.md
+++ b/content/day1/_index.md
@@ -4,11 +4,13 @@ title: Day 1
 weight: 5
 ---
 
-Day 1 of the main KubeCon event startet with a bunch of keynotes from the cncf themselfes (anouncing the next )
+Day 1 of the main KubeCon event startet with a bunch of keynotes from the cncf themselfes (anouncing the next locations for kubecon - amsterdam and barcelona).
+The also announced a new sovereign cloud edge initiative (CNCF/LF meets EU and soem german ministry) called "NeoNephos" with members like SAP, StackIt or T-Systems.
 
 ## Talk recommendations
 
-- TODO:
+- Not that much about gpus with good control plane scaling advice: [Scaling GPU Clusters without melting down](../01_scaling-gpu)
+- Migrate a cluster to ClusterAPI without downtime: [Day 2000 - Migrating from kubeadm + ansible to clusterapi+talos](../02_migrations)
 
 ## Other stuff I learned or people i talk to