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+---
+title: Title
+weight: 3
+tags:
+ - rejekts
+---
+
+<!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
+
+A short keynote from micrososft about their contributions to open source and used tools:
+- infra (kubernates, istio, hyperlight)
+- dev tools (helm, headlamp, radius)
+- sec (OPA, Ratify, Copa)
+
+They also highlighted their community involvement and the value of open source for every company.
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diff --git a/content/day-2/04_multicluster-crd.md b/content/day-2/04_multicluster-crd.md
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+---
+title: CRD Data Architecture for Multi-Cluster Kubernetes
+weight: 4
+tags:
+ - rejekts
+---
+
+<!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
+
+## Background
+
+CRDs:
+- Platform: Apacke Spark, Argo, Jupyter Notebooks, ...
+- Tier: Parts of a platform that include access policies, ressource usages and network controls -> e.g. beta or prod
+- ClusterSet: Shards within a tier (aka availability zone)
+- Cluster: Part of a Clusterset that can be destroyed/recreated
+- ComputeNamespace = Namespace + ServiceAccount + LimitRange + ResourceQuota + RBAC
+-   Part of a clusterset, all clusters which are part of the set have the same ComputeNamespace
+
+## Goals & Challenges
+
+Scale: 9000 Software Engineers
+
+Challenges:
+- Scaling
+- Decomposition
+
+Goal: Manage software platforms on kubernetes via kubernetes utilizing opterators
+
+## KEPs by the SIG-MultiCluster
+
+### Cluster Profiles
+
+- Name
+- Manager
+- Status
+    - K8S Version
+    - Conditions (Helath)
+- Cluster Access, options
+    - Work API (another proposal)
+    - Push via OIDC
+    - Push with Secret
+    - Zertificate Auth
+
+### ClusterSet
+
+- Within a ClusterSet namespace sameness applies -> All namespaces are the same in all clusters of a set
+- Mutation = Delete and recreate cluster
+
+### Clusternames
+
+- Unique Name
+- Valid RFC 1123 DNS label
+
+### Cluster Inventory
+
+- All ClusterProfiles should reside in a dedicated hub clusters
+
+TODO: Diagram
+
+## HA
+
+- They use Kine (by k3s) to shim etcd to postgres
+
+## Referential Integrity
+
+- The CRDs all refer to each other (e.g. Tier --> Platform)
+- Solution: CEL Expressions combined with webhooks and operators for business logic validation
+
+## Resource Creation
+
+- They have a simple api that is just a kubeapi wrapper
+
+TODO: Diagram
+
+## Q&A
+
+- Why does everyone build their own multicluster stuff instead of utilizing open soruce
+    - Threir solution predates SIG-Multicluster
+    - They are using some open source solutions like karmada
+- Could you explain ClusterProvile<->ClusterInventory again: He did, see livestream
+- Where does your postgres run (does it run on the same kubernetes it shims)?
+    - There are no cross-dependencies
+    - The managment-clusters are lightweight
+- Are you running a real kubernetes cluster for the hub?
+    - Nope we just use the apiserver
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diff --git a/content/day-2/_index.md b/content/day-2/_index.md
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 ## Talk recommendations
 
-* TODO:
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+- The Cluster API Migration Retrospective: Live migrating hundreds of clusters to Cluster API
+- CRD Data Architecture for Multi-Cluster Kubernetes
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