Clustering with k3s

10 Lektionen in dieser Stufe

1. Why Cluster Pis: Availability Versus Complexity
   Decide when a cluster helps and when one good node is better. · Lab: Write the availability requirement for a service and judge whether a cluster is justified.
2. Preparing Nodes: cgroups, Fixed Addresses and PoE Power
   Configure boards so the cluster software can run on them. · Lab: Enable memory cgroups, set fixed addresses and power three nodes over PoE.
3. Installing a k3s Server and Joining Agents
   Bootstrap a control plane and add workers. · Lab: Install the server, join two agents and list the nodes.
4. Pods, Deployments and Services
   Describe an application declaratively and scale it. · Lab: Deploy your Flask image with three replicas behind a service.
5. Ingress, Load Balancing and TLS in the Cluster
   Route outside traffic to services by hostname with certificates. · Lab: Publish two applications under different hostnames with TLS.
6. Persistent Volumes on Small Clusters
   Give stateful workloads storage that survives rescheduling. · Lab: Run the broker and database with persistent volume claims and move the pod to another node.
7. ConfigMaps, Secrets and Helm Charts
   Separate configuration from images and install packaged applications. · Lab: Move settings into ConfigMaps and Secrets and install the monitoring stack from a chart.
8. High Availability with Three Server Nodes
   Run the control plane with embedded etcd and understand quorum. · Lab: Rebuild the cluster with three servers and shut one down.
9. GitOps: Letting the Cluster Pull Its Own Configuration
   Make a Git repository the single source of truth. · Lab: Install a GitOps controller and deploy a change by merging a commit.
10. Node Failure Drills and Rolling Cluster Upgrades
    Drain, upgrade and replace nodes without downtime. · Lab: Drain and upgrade each node in turn while a load test runs.

Abschlussprojekt

A three-node PoE-powered cluster that runs your dashboard and broker with TLS ingress, keeps serving when one node is unplugged and deploys from a Git repository.

Teile für diese Stufe

• 3 × Raspberry Pi 5 or Pi 4 (4 GB or more)
• 3 × PoE+ HAT for the chosen board
• 1 × PoE+ Gigabit switch 5-port or 8-port
• 4 × Ethernet patch cable
• 3 × NVMe SSD or microSD card 32 GB per node
• 1 × Cluster case or stacking kit

In jeder Lektion legst du die passenden Teile direkt in den Warenkorb. Raspberry Pi →