Ansible and Kubernetes

Aug 15, 20182 likes835 views

Ansible is an essential tool for modern infrastructure automation, and Kubernetes is an essential tool for modern application deployment; together, they are a DevOps powerhouse! In this presentation, Jeff Geerling (geerlingguy) explains Kubernetes and goes through some ways Ansible can help make the Kubernetes experience better.

Ansible and Kubernetes
Jeff Geerling 
Ansible St. Louis 
2018-08-14

• Automatic binpacking
• Horizontal scaling
• Self-healing
• Rollouts and Rollbacks
• Service discovery and load balancing

Important question: Do you need Kubernetes?

What can Ansible automate?
• Bare metal cluster setup and management
• Container lifecycle: build, test, push
• Kubernetes manifests (& Helm charts, etc.)
• 100s of things still running outside Kubernetes

Ansible tools for K8s
• Cluster setup
• Minikube, GKE, EKS, AKS, DO K8s, etc.
• Kubespray
• Kubernetes roles (e.g. geerlingguy.kubernetes)
installing kubeadm, docker, CNI, etc.

Ansible tools for K8s
• k8s module
• Uses kube conﬁg ﬁle, K8s REST API
• Can manage resources with inline or ﬁle-based
manifests (vars, Jinja, yay!)

Raspberry Pi Dramble
• Fun experimental cluster project
• 99.9%+ uptime since 2015
• www.pidramble.com
• GitHub Project

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Exceptions allow developers to handle error cases expected to occur infrequently. Ideally, good test suites should test both normal and exceptional behaviors to catch more bugs and avoid regressions. While current research analyzes exceptions that propagate to tests, it does not explore other exceptions that do not reach the tests. In this paper, we provide an empirical study to explore how frequently exceptional behaviors are tested in real-world systems. We consider both exceptions that propagate to tests and the ones that do not reach the tests. For this purpose, we run an instrumented version of test suites, monitor their execution, and collect information about the exceptions raised at runtime. We analyze the test suites of 25 Python systems, covering 5,372 executed methods, 17.9M calls, and 1.4M raised exceptions. We find that 21.4% of the executed methods do raise exceptions at runtime. In methods that raise exceptions, on the median, 1 in 10 calls exercise exceptional behaviors. Close to 80% of the methods that raise exceptions do so infrequently, but about 20% raise exceptions more frequently. Finally, we provide implications for researchers and practitioners. We suggest developing novel tools to support exercising exceptional behaviors and refactoring expensive try/except blocks. We also call attention to the fact that exception-raising behaviors are not necessarily “abnormal” or rare.

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If we were building a GenAI stack today, we'd start with one question: Can your retrieval system handle multi-hop logic? Trick question, b/c most can’t. They treat retrieval as nearest-neighbor search. Today, we discussed scaling #GraphRAG at AWS DevOps Day, and the takeaway is clear: VectorRAG is naive, lacks domain awareness, and can’t handle full dataset retrieval. GraphRAG builds a knowledge graph from source documents, allowing for a deeper understanding of the data + higher accuracy.

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Ansible and Kubernetes

1. Ansible and Kubernetes Jeff Geerling  Ansible St. Louis  2018-08-14

2. What is Kubernetes

3. • 2013 - Google wants to open source 'Borg' • Trivia: Originally named 'Seven of Nine', thus 7 sides in logo • a.k.a. 'K8s' (k-8 chars-s) • Origin story here

4. • Automatic binpacking • Horizontal scaling • Self-healing • Rollouts and Rollbacks • Service discovery and load balancing

5. Important question: Do you need Kubernetes?

6. What can Ansible automate? • Bare metal cluster setup and management • Container lifecycle: build, test, push • Kubernetes manifests (& Helm charts, etc.) • 100s of things still running outside Kubernetes

7. Ansible tools for K8s • Cluster setup • Minikube, GKE, EKS, AKS, DO K8s, etc. • Kubespray • Kubernetes roles (e.g. geerlingguy.kubernetes) installing kubeadm, docker, CNI, etc.

8. Ansible tools for K8s • k8s module • Uses kube config file, K8s REST API • Can manage resources with inline or file-based manifests (vars, Jinja, yay!)

9. Raspberry Pi Dramble • Fun experimental cluster project • 99.9%+ uptime since 2015 • www.pidramble.com • GitHub Project

10. Raspberry Pi Dramble • Fun experimental cluster project • 99.9%+ uptime since 2015 • www.pidramble.com • GitHub Project

14. www.ansiblefordevops.com

15. Discuss!

Ansible and Kubernetes

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