KubeCon 2024 - Building IT Green

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We need to shift traffic – on a massive scale – to a strong rail network, in order to achieve our climate targets T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 3 FOR THE CLIMATE. Strong Rail is critical to achieving the climate targets set by the German government and the two-degree target set globally. As such, Strong Rail is a source of hope in the fight against climate change. We must achieve those targets so that future generations can come of age in a livable world.

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Global electricity demand from data centres, AI, and cryptocurrencies, 2019-2026 T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 4 0 200 400 600 800 1000 1200 2019 2020 2021 2022 2023 2024 2025 2026 Base case Low case High case the worst scenario: equivalent adding the electricity demand of Germany the best scenario: equivalent adding the electricity demand of Sweden Source: IEA, 2024

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As part of our IT strategy work, we* asked ourselves: For which topics do we have to take a clear position and bear responsibility? Especially in the role of a publicly owned association? >16 companies that are regarded as one company by the customer. CEOs / CIOs Grassroots movement Green Digitalisation ... and founded the Group-wide Green Digitalisation initiative. Back in 2021/22, together with 16 DB CIOs, we defined 'Green IT' as a relevant topic T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 5

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Can we measure our cloud footprint? T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 6 Assignment to Application (Tag Support) Granularity Actuality Energy use Emissions before compensation

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T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 Source: Fischer, M. et al. (2023). The Concept of Sustainable Development. In: Sustainable Business. SpringerBriefs in Business. Springer, Cham. https://doi.org/10.1007/978-3-031-25397-3_2

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T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 12 Scaling 70% is the average CPU utilization of our shared clusters only 15% of the CPU are effectively used by the applications

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Once it runs, no one cares T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 13 Setting up a Vertical Pod Autoscaler (VPA) apiVersion: autoscaling.k8s.io/v1 kind: VerticalPodAutoscaler metadata: name: my-vpa spec: targetRef: apiVersion: apps/v1 kind: Deployment name: my-application updatePolicy: updateMode: Auto Defining requests & limits apiVersion: apps/v1 kind: Deployment metadata: name: my-application spec: template: spec: containers: - name: my-container image: my-container-image resources: requests: memory: "512Mi" cpu: "250m" limits: memory: "1Gi" cpu: "500m" Out with expensive guesswork VPA ftw!

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Energy and CO2 -emissions in near-real-time Kepler (Kubernetes-based Efficient Power Level Exporter) and Grafana T-Resort | DB Systel GmbH | Dr. Gualter Barbas Baptista | | KubeCon Paris | Mar 21st 2024 17 Energy Mix Hourly mix and CO2 intensity per country eBPF energy stats eBPF tracepoints and perf counters Cluster Metrics Prometheus metrics, exported from Kubernetes Clusters Control Optimize DB Systel or DB Partner Power estimation Through kepler online learning model server Grafana Annotations Alerts Software Artefacts develops deploys watches Developer Observe Dashboard Platform user

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Gualter Baptista Lead Consultant Platform Strategy and Enablement [email protected] Let‘s stick together! Felix Becker Senior Manager Internal Developer Platforms [email protected] Christian Berger Product Owner Developer Experience Platform [email protected] Bastien Grasnick DevOps Engineer Kubernetes Platforms [email protected]